What do you do when you have a lot of time on your hands, a whole case of “Altoid” style metal boxes for a project that never came to fruition, and a bags full of surplus electronics parts? If you’re me, you end up with stuff like this:
So I was sitting around this morning staring at all this stuff on the shelves down here in my version of a mad scientist’s laboratory (I’m not really mad, only slightly eccentric.) wondering what I could do that would A) kill time because dear lord I was getting bored (so, sooo bored) after being in self imposed exile for weeks, B) be really, really cheap, C) be fairly easy to do because even though I was bored, I’m also lazy, and D) use up some of the junk I have laying around like that bag full of weird little switches. So there I was with a bunch of small metal boxes, a bunch of LEDs, a bunch of switches that aren’t good for much of anything, at least not for anything I normally tinker with, and I started thinking – ooo, it’s lunch time, let’s go eat.
But after lunch I thought hey, there is no such thing as having too many flashlights, is there? I mean whenever you need a flashlight either you can’t find one, or the batteries are dead, or someone took out the batteries to stuff in the remote for the TV or to power a robot or weather station or something. Even better, maybe MrsGF might stop wondering if she needs to call someone about my “problem” with accumulating various parts and gadgets and similar stuff if I actually use some of this stuff to crank out something remotely useful.
(Sidenote: LEDs are a lot of fun to play with, and cheap to boot. A few LEDs, some resistors, a 555 timer, a few transistors, maybe a microcontroller, and you too can have a lot of fun building really cool and utterly useless little gadgets)
So first I need a 3V power supply of some kind because the LEDs I got want to be fed about 3 volts. AA batteries work well for this. (So would AAA batteries, BTW) Two AA batteries together will put out 3V so… Oh, I didn’t have a battery holder thingie. Ah, well, no problem there. Just solder the suckers together. Solder the negative pole of one battery to the positive of the other with a hunk of wire, solder jumper wires on, and away we go. Instant battery pack.
Is this safe? Um, maybe? Probably not? Is it easy? Not really. It’s a pain in the neck. Solder doesn’t want to stick to those suckers. (Hint: scuff the surface of the battery with fine sandpaper. Seems to help the solder adhere.) But this is a doomsday flashlight, remember? You don’t need neat and tidy and professional looking, you just need something that works. Jury rigging is encouraged.
Speaking of jury rigging…
What about actually making some light? That’s the easy part, really. A couple of resistors for current limiting, a couple of LEDs, and away we go.
Now for mounting the LEDs in that case. How the heck do we do that? I don’t have any of those fancy mounts… Well, we’ll just drill some holes just barely big enough to shove the LED through and add lots and lots of glue.
Now, to sort through this lot to find a switch that might work…
The problem when you buy bulk lots of stuff labeled “100 Misc. Switches, $1.99” is that the chances of you getting anything actually useable out of that lot is pretty slim. Still, we work with what we got. All of those are momentary contact switches that stay turned on only as long as pressure is applied to them, and they aren’t really suited for what I want. Unless… Ooo, I know! Use the lid of the case as the switch. Close the lid it puts pressure on the switch and turns it on. Open the lid and it turns off.
And this is what I ended up with. LEDs glued into holes drilled in the end of the case. Lots of plastic tape to insulate the wires. The batteries wrapped in tape and held in with a self adhesive velcro pad, and the switch glued to the top of the battery conveniently makes it exactly the right height to turn on when the lid is closed. Damn, that was lucky there because otherwise I had no idea how I was going to mount that switch. Ooo, can you say serendipity?
And, damn, it actually works??? Yeah, it does. Closing the lid puts enough pressure on the switch to turn it on. Open the lid and it turns off. And puts out a surprisingly large amount of light, too. Damn, I actually made something useful? Wow!
It also uses very, very little power. I put it on the meter and it draws about 0.005 amps. A set of AA batteries will probably keep this thing going 24/7 for a couple of weeks. Which is good because changing the batteries in this thing would be a royal pain in the neck, them being soldered in like that.
Total cost on this, excluding the batteries, is maybe a buck at the most? Most of this stuff like the LEDs and the switches were bought in large lots as “surplus” in a moment of weakness when I was scrounging around on-line. (“Ooo, that’s a real deal! I’m sure I’ll need 1,000 miscellaneous LEDs in the future”) It took maybe half an hour to put it all together, and it only took that long because I’m easily distracted. And because it took me 10 minutes to find a roll of electrical tape.
Being stuck in the house “social distancing” (OMG I’m so bored) has some advantages, one of which is being able to get caught up on a lot of stuff. One of those things is the MFJ-8100K world band shortwave radio kit. That’s the little beastie you see in the photo below that I (ahem) stole borrowed from somewhere on the internet.
Damn, that’s pretty slick looking. It beats the heck out of what the average electronics kit looks like when it’s done. Most of them don’t even offer any kind of decent case. Whether it actually will look like this when it’s done remains to be seen because I haven’t actually built it yet as I write this. Instead of putting it together and taking some photos and talking about it after it’s all done, I’m going to do this live, so to speak, writing and photographing as I go along so you too can experience the joys and pains associated with putting something like this together.
I should warn you ahead of time that this could get pretty lengthy because I’ve done little more than just open the box and it is already looking like this is going to be a problem.
But let’s look at the basics a little more closely before we get started. It’s a world band shortwave receiver with 5 bands. They cover 3.5 – 4.3 mHz, 5.85 – 7.4 mHz, 9.5 – 12.00 mHz, 13.2 – 16.4 mHz and 17.5 – 22 mHz.
As for the basic design, this is a regenerative receiver, a design that dates back to, oh, the 1920s or so, and was quickly abandoned as soon as superhets were developed. And for good reason, as anyone who has ever fallen off their chair from the blast of noise if you tweak the regen just a tad too far and it goes into oscillation can tell you. About the only good thing regenerative receivers have going for them is a fairly low parts count and easy assembly. Well, that’s not really true. They can be decent receivers once you get used to their quirks, but with really high quality superheterodyne designs out there, why even bother with one of these? How did I even end up having this on the shelf in the first place? I don’t remember buying it. Do I have people breaking into the house and leaving me stuff instead of stealing it now?
The first thing I started wondering was why the heck is this thing so expensive?It’s going for $90, for heaven’s sake. And there is nothing exotic or hard to find in the electronics. While that variable capacitor is kind of pricey (that goes for about $20+ alone and I know that because I had to buy one of the things a few months ago) But other than that I think there’s maybe $10 worth of parts in the thing. I suspect that really fancy faceplate and heavy duty metal case probably costs more than the electronics inside does.
But let’s get on with this.
Opening the box and poking around.
This is what the promotional photos tells you is in the box.
First I should point out that this kit starting with the photos below is shown exactly as it came and while I assembled it. The box was still sealed and I hadn’t opened it until I started this. What it really looks like when you open the box is this:
Um, okay… Are those screws and nuts rolling around loose in the box? Yeah, they are. And not just screws and nuts and washers, we got electronic components floating around loose in there too. Oh, goodie.
Opening the box and finding components strewn about all over inside doesn’t exactly inspire confidence about the quality of a product. Whoever originally packed this thing and chucked in the little plastic bags holding the components hadn’t bothered to actually close up the plastic bags.
And as for the case, well, damn, that’s probably the best case I’ve ever seen for a kit in a long time. Beautifully finished, heavy steel, with an equally beautiful brushed polished steel faceplate.
You can’t get much better than that. See what I mean about the case probably costing more than the electronics? It’s – it’s shiny. Oooo
The rest of what was in the box looks like this:
As noted, most of the little baggies containing parts were open and had shed a considerable number of electronic components, screws, washers, etc. all over the inside of the box..
On the far right of the photo above you’ll see a strip of components held together with bits of yellow tape. Those are 3.3 uH inductors and those were not in the kit. I had to dig those out from my “Wall O’ Parts” because the kit wants one, and MFJ either thoughtfully failed to provide one because they figured I’d be getting bored by this time and needed to get up and stretch or something, or it got lost because of they left the baggies open. I expect I shall have to resort to the Wall O’ Parts several times as I try putting this sucker together. I’ve only just started to look at this and sort through parts and I’m already finding stuff missing, so I’m a wee bit irritated. There is nothing more upsetting than getting into an electronics kit and finding parts missing. Me, I have hundreds of components sitting on the shelf (well, if I can find ’em, that is) but the average person building this is not going to have that luxury and is going to be royally ticked off.
The circuit board looks reasonably well made and the parts locations are all nicely detailed. You could probably put it together without instructions if it weren’t for a few gotchas, like having to wind your own coil on a toroid.
Where’s the fecking Manual???
Now, the more sharp eyed amongst you might have noticed something missing from those photos up there. Where the heck is the manual/assembly instructions? Well, you don’t see it because there isn’t one. Instead of a manual there is a half sheet of paper telling me I need to download the manual from the MFJ website, giving me a URL to go to. So I go to the webpage as instructed and find a bad PDF of the circuit diagram which was so low resolution I couldn’t even make out the symbols or component labels. It looked like someone had almost deliberated fuzzed out all of the labels and component symbols, and the “manual” was actually a booklet in PDF telling me how to use the radio, not how to put it together. No assembly instructions. No readable schematic. Oh, goodie…
A search on MFJ’s site using its own search function turned up a reference leading straight back to the useless info I’d already seen. I finally ran a general search on Google and found the real assembly manual tucked away somewhere on MFJ’s site and I printed it out.
(Update 3/27/20: And now I can’t even find that website, for pete’s sake! I was going to put the link to the correct PDF in here as I edit this before posting it, and when I just tried I get a “page not found” error. MFJ is apparently upgrading its website and I can’t find it at all. Good job, there, MFJ. I didn’t keep a copy of the PDF, but at least I printed the thing out so I can at least take a stab at this. But anyone else wanting that booklet, well, it looks like you’re on your own.)
The manual itself (if you can find it) is actually pretty good. Sort of. Clearly written, mostly, with lots of detail, but sadly lacking in illustrations.
So let’s sling some solder and see what happens.
Now that’s interesting. Look at the 4 inductors up there. Notice anything different about one of ’em? Yeah, the third from the left is about half the physical size of the other three. The big three were supplied with the kit while the small one is my replacement and is about half the physical size, but it is the right specification according to the color codes and I put it on my tester just to double check, and it should be the right one. Is this going to be an issue? No idea at this point. All of the inductors I have in stock are the smaller size.
Also, more missing parts. Just found two resistors are missing. Look at this pic:
R3 and R6 were missing so I had to pull those off the shelf. Notice that they’re an entirely different color from the kit supplied one, R17. I use the generally more reliable metal film resistors (the blue ones) while the kit supplies carbon resistors (the tan ones). Now very, very rarely the type of resistor can make a difference, so I’m hoping that isn’t the case here.
Later – Missing parts list now sits at 1 missing inductor, 4 missing resistors, and 2 missing capacitors.
And now there’s an issue with one of the electrolytic capacitors.
C14 there next to the IC socket is, according to the instructions, supposed to be a 10 uF cap, but the kit supplies a 1 uF. Or at least I think that’s the one because the 1 uF is the only one left. Do I follow instructions and put in a 10, or use the 1 uF supplied? I finally pulled a 10 uF off the shelf and used that in the hopes that the instructions are right and the parts picker was wrong. (Later – Apparently the 10uF was the right choice because now that it’s done it works)
And speaking of IC sockets, and this applies to whenever you’re soldering a socket, use caution soldering the pins because it is very easy to apply a tiny bit too much solder and end up with solder bridges shorting out the pins. And it’s easy to do a bad joint as well. Double check under a magnifier.
Time to install the variable cap which is how you tune this puppy. And…
And the solder lugs on the cap are way too big for the holes in the circuit board. I could either drill the holes out, which I don’t want to do because the solder pads are none too large to begin with, or I could trim off the lugs. I finally trimmed the lugs off.
Above here I’m trying to mount the volume control and the regen control. They don’t make this easy either. We’ve gone from holes being to small to holes being way, way too big. Note how some of those holes at the top edge of the board have been double drilled, which makes them way too large for the solder lugs on the potentiometers that are supposed to fit in there.
And speaking of soldering, look closely at those solder pads on that board. It’s difficult to see in the photos but almost all of them seem to be covered with some kind of oxidation that makes it difficult for the solder to adhere. I’ve been using a bit of a scotch brite pad held in a needle nose pliers to buff them before I solder anything.
Then there’s the band switch. The switch has 8 pins, the board has 7 holes. Hmm… Let’s look at the manual. Ah, here we are… Oh, nothing. Says nothing about what to do about the missing hole. Oh, goodie.
I ended up bending the extra pin out of the way and keeping my fingers crossed that it wouldn’t get mad at me. (Later – Don’t know if I was supposed to do this or not but the thing is working this way.)
That circle thing with the white wire wound around it is a coil made by winding 8 turns of wire around a provided toroid core. Some people get a bit weird about winding their own coils. I’m not sure why. A small one like this is a piece of cake. They don’t get nasty until you start having to make ’em with, oh, 30 or 40 turns.
And there it is, ready for testing. It runs off 9V and supposedly a 9V battery will last for weeks and weeks as long as you remember to turn it off. I don’t have a 9V battery, tho, so I hooked it up to my DC power supply and…
Damn, I wish my upload speed wasn’t about 15K baud so I could put up a video of this, but the damned thing actually works! I won’t go through all of the alignment procedures because they will bore you to tears. This is, believe it or not, an actual, working SW receiver. Not a very good one, granted, but it will pick up something.
But then there’s this
This is it fully assembled, mostly. You will note that I don’t have the knobs on. There is a reason for that. MFJ neglected to include the collar nuts you need to actually attach the front properly, anchor the controls down so I can put the knobs on. Now there were indeed collar nuts in the box. You probably saw that in the photos from the box opening. But they were for control shafts about twice the size of these. Sigh… Thanks again, MFJ. Complete assembly is going to have to wait until I can get the right sized nuts.
Okay, this has gone on long enough. Let’s wrap this up. What’s the overall assessment of this beastie?
Well, on the plus side it looks good. It is, amazingly enough, a working radio receiver, although not what I’d call a good working radio. It wasn’t hard to put together. Just about anyone who knows which end of a soldering iron to grab could put this together. Well, mostly, with the application of a bit of common sense. And that case sure looks cool.
But then we come to the negative side.
First problem is the price. They’re getting $90 for this thing, my friends. While the Elenco AM/FM receiver I put together a couple of weeks ago is far more sophisticated, much more sensitive, has an actual amplifier so it can drive a speaker and not just headphones, and sells for half the cost of the MFJ kit at about $44. Granted, it doesn’t come with the fancy case, but you can always cobble together something to throw the Elenco into. And when you’re done with the Elenco you’ll have a radio you can actually listen to, whereas the MFJ is never going to be more than a curiosity for most people.
Then there are the missing parts. A half dozen or so resistors, two capacitors, an inductor, the collar nuts to hold the controls in place, all missing. I don’t know if this was a problem with the person who packed up the parts in the first place, or if they were lost somehow because the bags weren’t closed, or what. My guess is that they were never in there to begin with, because while parts did spill out, the box was sealed and there were no openings for anything to fall out.
As I said before missing parts isn’t much of a problem for me, but for someone who doesn’t have a “Wall O’ Parts”, like some kid doing this for a STEM project or someone who just enjoys occasionally tinkering with kits, this could be a real problem. Sure, you could probably email MFJ and they’d probably replace the parts. Eventually. Maybe. But come on, they should have all been in there in the first place.
Then there’s the manual. Or, rather, the lack of one. What’s the matter with you people over at MFJ? You could throw an 100 page product catalog into the box but you couldn’t be bothered to run off a 30 page manual on the office printer and throw that in too? And then even worse, direct me to a website to find the manual that doesn’t exist? Or to utterly useless schematics?
I’m really disappointed with this because this could have been a really good kit if MFJ had bothered to just just be a little more careful.
So, because of the high price, the missing parts, the missing manual, etc. I can’t score the 8100 very high. On a scale of A to F, where A is excellent and F is abysmal, I’d give the 8100 kit a D+.
When I started moving my stuff from the office upstairs to the new workspace in the basement I knew I was in trouble when I plugged in the laser printer, turned it on, and the lights all went dim. So the electrical contractor got here at 6:50 AM the other morning and some two hours later I had the radio shack/shop rewired with new circuits and outlets. The electrical in this space was a bit scary. I think the whole room was connected to a single 15 amp circuit. I was running my radios and other equipment off heavy duty extension cords running into my woodshop and, well, it was just nasty all the way around. The grand total for all of the work and parts ran about $500 but it’s going to be worth it, for safety alone if not for convenience.
So now I have two, 4 outlet 120V boxes, each on its own circuit, plus a 220V outlet over on the radio bench, and two new 120V circuits for the workbench.
Why call in a contractor instead of doing it myself? Because I know where my areas of competence are. I worked on a farm and in building maintenance for years and I can do just about anything – framing, finish carpentry, drywall, installing doors, plumbing, laying tile… But electrical? I’ve had no training or experience in doing household electrical, and considering how dangerous it can be, well I’m going to let a trained electrician do that.
Tubes & Stuff
So eldest son shot me a text Friday asking me if I wanted a vacuum tube tester, free, and I texted back “r u nuts? yeah i want toob thingie!” or something to that effect and he showed up last weekend with this:
The thing with free equipment is that it’s often going to be something useful only for parts, if that, but in this case it turned out to be a genuine, working vacuum tube tester. Oh, it has a few issues. The tube sockets have some corrosion that needs to be cleaned up and it could use a good cleaning in general. The insulation on the cords is brittle so they need to be replaced, but other than that the thing actually seems to work and inside it actually looks almost new.
I haven’t done much with equipment with vacuum tubes of late, but I never know what’s going to show up around here, so this could come in handy.
Tinkering with Stuff
I am building a radio receiver. No, not The Great Radio Fiasco Project. That project is more or less on hold until I can get some parts that seem to have become unobtanium for some reason. I may end up having to change the design. No, this is an Elenco AM/FM receiver kit. Best of all it was free! Well, maybe it was? I found it in a box of junk I was sorting through as I continued the apparently never ending project of cleaning out the basement.
I don’t remember ever buying this thing and have no idea where it came from, but it’s in my basement, in my box, so I’m assuming it’s mine, so I’m going to put the thing together and see what happens. It’s a fairly elaborate little radio and from time to time the instructions seem to go wandering off into fantasy land. I suspect that the instructions that were in the box were written before the circuit board was changed and no one bothered to correct the instructions. So that makes things a bit interesting.
Also in the same box of junk I ran across an unopened multiband shortwave receiver kit distributed by MFJ. I don’t remember ever buying that either, and I would remember since that one costs about $80 and I darn well wouldn’t have spent that much. I suspect both were in a boxes full of “valuable assorted radio parts” (i.e. junk) I picked up for next to nothing at a hamfest, and the box just got shoved on a shelf and forgotten about before I bothered to sort through it.
Over the weekend it hit 50 degrees. Almost all the snow melted, motorcycles were out on the streets, a very pleasant weekend all around. Tomorrow it’s supposed to hit 55 degrees!
So, of course, today it snowed. Sigh… I know Wisconsin in known for having some odd weather, but this is ridiculous.
I am sure you heard about covid-19. You’d have to have been living in a cave on Mars to not have heard. Wisconsin has only 6 confirmed cases, but the potential of it spreading, and spreading quickly, has everyone concerned. At least one school district has closed, the UW system is extending spring break and advising students not to travel, companies are canceling employee travel. The state basketball tournaments are starting up this week and WIAA just announced that general spectators will not be allowed, only the teams and necessary personnel and a small pool of sports reporters will be permitted.
I want to think a lot of this is hype and paranoia, but, well, I’m right smack dab in the middle of the category of the highest risk for death if I catch this sucker, so yeah, I’m a wee bit paranoid. MrsGF and I are supposed to go to the symphony this weekend, but sitting elbow to elbow in a theater full of hundreds of coughing, sneezing, hacking people for two hours? Uh, no.
What I really find troubling is the huge amount of misinformation being spread, some of it through ignorance, but a lot of it being spread deliberately. Some of it by our own government. I wasn’t going to spend a lot of time talking about this because, well, let’s face it I don’t have that many people who read this so it isn’t going to make a dent in things, but if it helps correct some of the stuff floating around, I suppose I should go into this a bit.
First, there is no cure for covid-19. None. Zip. Zilch. Zero. There is no drug, no “natural remedy”, no combination of herbs, no “silver” concoction. None. If anyone is trying to sell you such a thing, it is an outright scam.
Second, there is no magic herb or substance or “essential oil” or vitamin or magic crystal or “holy oil” that will somehow keep you from catching the virus. Again, if anyone tries to sell you such a thing, it is an outright scam.
Third, there is no vaccine “just around the corner”. Yes, a vaccine is being worked on and there are some promising candidates. But it will be months before one is generally available and even longer before it can be mass produced.
So what can you do?
Wash your hands. A lot. The best preventative is hand washing. Wash your hands using soap and running water. This doesn’t kill the virus, but it does physically remove it from your hands, which is just as good. Do not touch your face except immediately after you’ve washed your hands. A primary method of getting the virus into your system is touching your eyes, nose or mouth.
Do hand sanitizers work? Yes, but only if they’re the right kind. They have to have at least 60% alcohol content. Non alcohol based sanitizers are out there, but no one knows if they actually work or not. The so-called “all natural” hand sanitizers don’t work at all. They’re little more than hand lotion.
Face masks – there is a lot of debate about whether they work or not, and the consensus is that they don’t do much to keep you from getting the virus. They can prevent people who already have it from contaminating others, it seems. The problem, though, is that most of the masks I’ve seen people wearing are dust masks intended to keep dust from getting into your lungs, and were never intended to keep out viruses to begin with. Most people also don’t know how to wear them properly. Heck, I’ve seen a lot of people who have them pulled down to expose the nose. If you do that you might as well not bother at all. Same for guys with beards. If you have a beard, don’t bother. If you can’t seal the mask against bare skin, it isn’t going to work at all.
Social Distancing – what the hell is social distancing? It’s a polite term for keeping the hell away from people. Do not shake hands, do not hug, do not kiss people. Try to keep at least one meter (three feet) away from people if you do have to interact with them.
Avoid crowds. Do not attend sporting events, concerts, meetings or other events where large numbers of people have gathered. I don’t know about where you live, but here most such events have been canceled or postponed anyway. (Although a seriously troubling number have not and are still scheduled). And yes, that goes for church services too. No, being in a church is not going to somehow protect you from getting the virus despite what some utterly irresponsible ministers and priests have been saying. Remember that theprimary spreaders of the virus in South Korea when the outbreak first began there were churches. Even the Pope canceled most of his public appearances for heaven’s sake. And if you’ve booked a cruise on a plague ship (ahem, excuse me) cruise ship, well, you’re on your own.
If you’re sick, stay home. About 80% of the people who get it have symptoms that are relatively mild and a lot of people will be tempted to continue with their normal daily routine. And thus risk spreading this to even more people. I realize this is damn near impossible for a lot of people, but the primary way this is spread is by people with relatively mild cases going out in public. Do you really want to be responsible for infecting your friends, your family and your neighbors with this?
Anyway, enough of this. I’ve been babbling long enough.
So, Mr. (or Ms.) mad scientist, you’ve finished work on your Nuclear Confabulator Disinto Beam 3000 Mark IX at last! You’re all set to begin your conquest of the world, and you go to power up your NCDB3 to bring the world to its knees and…
Oh, $#%@&&@! The damned thing needs 17.3 V DC to run and you don’t have a 17.3 V power supply. Grrrr… Wait, you think. All is not lost yet! You sort of remember you had an old 17V power supply from an old fax machine that you kept because it might come in handy someday. (Us mad scientists never throw anything away. Never know when it might come in handy.)
Now if you can just find the thing… Oh, wait, it must be in your Giant Box ‘O Cables®! You dig it out of the closet and eye it suspiciously. There’s no way you’re going to dig through that mess. And you can’t have one of your minions do it because your last minion left a week ago because you had to eliminate free coffee in the break room because, well, world domination costs money and you needed to cut back somewhere. Wait, did something just move in there? Eeek! Run and hide! It’s alive!
See? This is why you need a variable DC power supply on your workbench.
Long ago I got tired of fiddling around trying to find wallwarts, building battery packs or messing with transformers and rectifiers and all that nonsense to power some of the junk that comes through the doors here or that I tinker with myself. When you’re messing around building something, especially something that might not actually work anyway (i.e. most of my projects), you don’t want to go through all the trouble and expense of building or buying a power supply just for that one gadget. So I’ve had variable DC power supplies for a long time, and since my last one sort of … Well, it didn’t actually start on fire. I mean there weren’t actually any flames or anything. But it sure did smell funny.
So off I went scrounging around for a new one and eventually I ended up with this.
This puppy set me back about $60. It’s made in China… Well, just about everything is made in China these days, isn’t it? There are cheaper ones on the market, but with a lot of those the reviewers were, well, let’s just say the reviews were less than kind and leave it at that, shall we? The reviews for this one were pretty good, although you can’t believe that any more, either, because there are services out there which will, for a fee (of course) provide you with positive reviews for your products on just about any social media or sales site.
To be honest, I wasn’t sure what to expect from this thing. You can spend, heck, over $1,500 on a variable DC power supply depending on the quality, amperage and features you want or need, or as little as $30 or $40. So for a $60 power supply I would have been satisfied it was at least reasonably close to the voltage it indicated, and didn’t produce so much ripple that it looked like a roller coaster when I put it on the ‘scope. And not start on fire when I plugged it in and turned it on. Important, that. Not starting on fire I mean. One of the main questions you should ask is “How often does it start on fire?”
Let’s talk about power in general for a minute. If you already know all this stuff, just skip over this the following paragraph because you’ll find it boring. But there are people who don’t know, so let me give a very simplistic explanation of what’s going on.
We work with two entirely different forms of power. Both are electricity, yes, but the two systems, DC and AC, have entirely different qualities and uses. AC (alternating current) is fine for sending power long distances over power lines, running motors (some of them) and things like that, but for powering electronics, it sucks. Alternating current, well, alternates. DC doesn’t. And most electronics wants DC, not AC. That means almost all electronic devices that plug into your wall socket will have some kind of power supply which converts that 120V AC into a much lower voltage direct current which is fed to your device. Once upon a time this was done with bulky and heavy transformers, diodes and capacitors which took the AC, stepped it down to a lower voltage, and filtered out the sine waves, flattened out the curves, etc. and produced a constant DC voltage. Nowadays it’s mostly done with semiconductors and other lightweight components, but depending on the application you can still sometimes find equipment that uses the old transformer type systems.
So, back to the review of the Kuman.
As you can see from the photo it’s a nice looking little unit. It’s very light. I don’t think it weighs more than a pound or two. Fit and finish is nice. According to the specs it can put out up to 30V DC and handle amperages up to 5A. I plugged it in and hit the power button and…
Well, nothing happened. Uh ??? Oh, great. Was it DOA? I hit the power button a few more times and the display lighted up at last. I’m not sure what was going on there. That was the only time that happened, so I suspect there was some kind of coating or contamination on the contacts in the switch that wore off after I worked the button a few times. It’s worked every time since then.
I suppose the first thing I should have done was hook it to the VOM to make sure it was putting out power reasonable close to what the display claimed it was, but me being me, I just set it for 5V and plugged my clock kit into it and it worked just fine and dandy.
Then I thought oh, wait a minute, maybe I should check this thing out before I actually use it to try powering something expensive, so I got out the meter and hooked that up to it.
The voltage tests were very good. According to my Fluke the voltage of the PS was generally within 0.01V or better across the entire range that the PS puts out.
Next it was time to hook the oscilloscope to it and see how bad the ripple was.
Ah, what is ripple, you ask? Well, okay, you didn’t ask but I’m going to tell you anyway. To explain that we have to go back to the difference between AC and DC again. If you want a detailed explanation you can scoot over to Wikipedia and read this, or if you can’t be bothered, well, I don’t blame you because it’s boring unless you’re into electronics.
AC current, the stuff that comes out of the plug in your wall, is a sine wave. Which is shown in this little graphic over there on the right that I just stole borrowed from Wikipedia. The red line shows how the AC current alternates over time, going from positive to negative, and doing so at about 60 cycles per second, or 60 Hertz. But as I said before, most electronics doesn’t like AC current and wants to be fed DC. Your electronics don’t want that current cycling from plus to minus like that, it wants a nice, flat line that doesn’t alternate at all.
So, to see how good a DC power supply is, you need to look at the voltages it is producing and how it changes over a period of time, like plotting it on a graph. And that is exactly what an oscilloscope does, measure voltages over time and plotting it on the display (graph). What you want to see on the scope is a flat line, not something like, well, this over there on the left.
So I hooked it up to my scope and this is what I got
And, well, that’s not bad at all, really. In fact, that’s a hell of a lot better than I expected it would be. The PS was set to 4V. You’ll see in the lower left corner than I have the scope set so each division is 2V, the line is two divisions up from center, so that’s spot on 4V. And the line itself is pretty much smooth.
Well, you see a tiny bit of hash. The line isn’t perfectly smooth. But I zoomed in farther and fiddled with the timing and other technical stuff that would bore you to tears (it did me) and found out that while there is a tiny, tiny bit of ripple, that hash you see on that line works out to a deviation of about 0.0014 volts. And while some purists might be irritated by that, out here in the real world where I live that’s pretty darned good, especially for a sixty buck power supply, and isn’t going to be an issue for anything I’d use this PS with.
So, let me wrap this up because I’ve been babbling along here long enough.
For $66 this is a nice little power supply. Well made, attractive, small, light weight, handles 0 – 30V, and up to a little over 5 Amps. Calibration of the display is spot on according to my meter. And as for ripple, that’s down to around 0.001V which is pretty good for a PS in this price range.
And – you can’t get it any more. At least not off Amazon where I got this one. Sigh… It’s listed as unavailable now. I have seen it available from other vendors, though. And I’ve seen units that look exactly the same except for the brand name on Amazon. But watch out because this same PS, although with a different brand name on it, is going for nearly $100 and you can get it for at least $30 cheaper than that if you shop around.
Now if you’ve been reading this for a while you know there are two things I really, really like – gardening and fiddling with electronics. And when winter rolls in and shuts down gardening, that leaves electronics to occupy my time. Since I am still waiting for parts for the Great Radio Fiasco Project, I was looking for something else to play with and I ran across this on Amazon-
I like playing around with kits, but I hadn’t built one in ages because there aren’t a lot of them out there any more, and the ones that are on the market seem to either be for things I don’t want or need, or are geared for the kids STEM market and are pretty much useless. This one seemed interesting, though. And it was only fourteen bucks, so if it did turn out to be junk, I wouldn’t be out a lot of money. And it I might get an article out of it for the blog.
Let’s talk about kits in general, first. Once upon a time there was a very good reason why kits came about. Before the advent of things like printed circuit boards and semiconductors and all that stuff we take for granted these days, electronic devices like radios, record players, television sets, etc. were built almost entirely by hand, by workers who strung all of the connecting wires, soldered all of the components, etc. Building even a simple radio receiver required placing, by hand, dozens of individual components and hand soldering dozens, even hundreds of connections. Armies of individual skilled assembly people labored for hours at workstations to put these things together. Labor costs money. A lot of money. And eventually technologies like printed circuit boards and robotic assembly systems largely replaced those armies of workers, resulting in the ultra-cheap electronics we have today.
But back then, with labor such a huge part of the cost, someone came up with the idea of eliminating the labor entirely and just selling the parts and some instructions to people and they could build it themselves. The company still made a few bucks, and the buyer of the kit saved a lot of money by replacing factory labor with his/her own. And there were a lot of people willing to do this. Not just to save money but because a lot of people get a great deal of satisfaction from building things.
But as electronics became more complex with people demanding more and more features, designing and producing kits became increasingly expensive. At the same time because of robotic assembly lines and other advances in technology, it became cheaper and cheaper to produce fully assembled and tested electronics. It got to the point where making a kit was often considerably more expensive than just buying the thing outright. There are still kit makers out there, of course. But most of the kits I see these days are for cheap and pretty much useless little gadgets that you’d build and tinker with for a while, then shove it into a box until your children throw it away after you’re dead.
This looked like it might be interesting, though, and it was only $14 bucks, so what the heck. When you buy these cheap kits these days it’s something of a crapshoot. Reading the reviews can help, but with so many fake reviews, and reviews by, well, idiots, really, not even those are very helpful, I’m afraid. (I could probably do a whole column on just how to try to decipher product reviews on Amazon and other online vendors.)
When it arrived it was about what I expected. Instructions were almost certainly translated from Chinese into English by computer, but unlike a lot that I’ve read, they were actually useful and covered all the important points if you take your time.
Now before you get started you’re going to need some basic tools. If you’ve ever tinkered with electronics before you almost certainly have everything you need to put this sucker together. You’ll need a needle nose pliers with a fine tip to help place components. A tweezers will help too. Some of the components are pretty small. You’ll also need a wire cutter for snipping off the wires on components after they’ve been soldered onto the circuit board. You’ll need solder, of course, and you’re going to need the smallest diameter solder you can probably get. The solder I used was 0.032″ in diameter, 60/40 rosin core. If you use anything bigger than that you’re going to have a lot of problems with solder flowing places where you don’t want it.
You need a soldering iron, of course. Just about any hobbyist soldering pencil will work if it has a fine enough tip. I have a Weller variable temp soldering iron that I’ve had for years now. I like variable temperature soldering equipment because it lets me adjust the temperature to suit the type of solder I’m using, the size of the components, etc. They’re more expensive than a hobbyist soldering pencil, but not that much more expensive. This one isn’t in production any more, I think, but you can get a variable temp soldering iron for about $100 or less. A lot less if you shop around. Unless you use a soldering iron a lot, don’t spend a lot on one. What’s most important is that it has interchangeable tips so you can change the size of the tip to suit the work you’re doing. With this kit I used a very small spade shaped tip because I was working in rather tight quarters on this kit.
You’re going to need two more things. One is absolutely essential, the other highly recommended but not absolutely necessary.
You need something to hold the circuit board while you’re putting everything together. You’re going to be holding your soldering iron in one hand, solder in the other, holding a part in place with your third hand, and holding the circuit board with your fourth hand… Hm? What? You only have two hands? Yeah, so do I, which is why you need something like this. It’s a Panavise circuit board holder and while it isn’t ridiculously expensive, at around $60 – $70, it isn’t exactly pocket change either. I do a lot of work on circuit boards so something like this is absolutely necessary for me. If you’re just slapping a kit together, you can get away with something a lot cheaper or even cobble something together on your own out of alligator clips and stiff wire.
The other item that is very nice to have but not absolutely essential is a light on an articulated arm so you can aim it where you need it, with a built in magnifier. A lot of the components are very small, and a lot of circuit boards are very tightly packed, and even if you have good eyesight it can be a real strain to work on some of this stuff without some kind of magnification and good lighting. A light like this on an articulated arm with a built in magnifier can be had for about, oh, $40 or so.
Now, on to the clock itself. Putting it all together isn’t extraordinarily difficult, but it is a bit fiddly. There are a lot of solder joints to make. There’s a 28 pin IC socket, two 8 pin IC sockets, 16 resistors, assorted capacitors, a few transistors, a surface mount LED and several other goodies that all have to be fitted onto that board and soldered.
A few words about soldering: I’m not going to try to teach you soldering here. I’ve heard people claim that soldering is an art. It isn’t. Soldering is basic physics. It is the application of heat to a connector causing the solder and flux to flow and adhere to the connectors to form an electrically conductive connection between two or more components. Anyone can learn to solder, but it takes some knowledge and a lot of practice to do it properly. If you don’t know how to solder, or are just learning, this kit probably isn’t the place to practice. There are a lot of solder joints, spaced very close together, and it’s easy to end up with solder bridges, spatter and other problems. So if you’re new to this I’d recommend you try something more simple. Run a search for “solder training kit” over on Amazon or look at the other electronics suppliers out there and you can find more kits that are designed to teach you how to solder.
Some of the parts in this kit are very tiny and can be difficult to deal with, like soldering headers to a very, very tiny circuit board with an SMD chip on it that has to plug into one of the sockets. And the LED on the board is surface mount. Don’t let that scare you.
I’ve been soldering for, well, probably for longer than a lot of you reading this have been alive, so I zipped through that pretty quickly.
Anyway, the whole kit is very well designed, certainly above average for this kind of thing. The circuit board itself is beautifully made, with outlines and labels printed on the board itself showing the position of the components. All things considered, this is one of the better kits I’ve seen.
There were no missing parts, the instructions were decent, everything was well made. It is definitely a winner all the way around.
Even better, it worked the first time I powered it up! It requires about 5V DC and is intended to run off USB, but I just hooked it up to my variable DC power supply, turned on the power and away it went. It’s a really nice little clock, too. It has a photocell to adjust the brightness of the display depending on ambient conditions, a thermistor that lets it sense the temperature (the display cycles between time and temperature), has an alarm and it talks! Well, I’m not sure about the talking part because I haven’t hooked the speaker up yet. It comes with a clear plastic case that I haven’t put together yet. Eventually I’ll probably put together a power supply for it because I don’t want to have to run it off a computer’s USB port. I should have a 5V wallwart kicking around that would do the job.
Disclaimer: I do not get paid for reviewing products. I do not get special deals, free equipment, components or anything else. All the tools, equipment, parts, and everything you see here or I write about were purchased by me at full retail prices.
How stupid are we? Pretty damned stupid, if some of the stuff I saw recently is any indication. Let me explain. I wanted to get one of my sons a stereo system as a combination Christmas and housewarming gift because he was moving into a new apartment over the holiday. I haven’t bought any audio equipment in decades so I did some research and finally decided on a fairly nice and relatively inexpensive receiver, turntable and speakers. But along the way I stumbled across something that can only be described as a world where rationality doesn’t exist. In the world of audiophiles, things like logic, physics and rationality quickly get tossed out the window, it seems.
The lowly power cord is one example. It’s a simple thing, a power cord. You take some copper wire, wrap it in insulation so it doesn’t electrocute you, put a plug on one end to plug into your wall outlet, put another plug on the other end that goes into your equipment, and there you go. The only things you need to be concerned about are the insulation being good enough to protect you, the gauge of the wire being heavy enough to carry the current, and the plugs being well made and attached well so they aren’t a safety hazard.
But apparently all these years I’ve been wrong. Apparently every single thing I’ve ever learned about physics, electricity, electronics, atoms, electrons, everything, is just wrong. Apparently if I want the best “listening experience” the worst thing I can do is use an inexpensive power cord. I need to spend hundreds of dollars (or more, some of the cables I saw were selling for up to $5,000 for a six foot long electrical cord) for “special” power cords, with “special” connectors, made with, oh, hell, I don’t know – Made with hand harvested, free range, organic, artisanal copper atoms, lovingly caressed with special quantum crystals, and then sheathed in insulation woven from the pubic hair of virgin unicorns. (Hmm, unicorn pubic hair harvesting – there’s a phrase I never thought I’d see in a blog. Or anywhere else for that matter.)
I learned other things as well. Did you know that wire is directional? Apparently electrons only want to flow in one direction along a wire. Wow. I had no idea. I also learned that I need to “burn in” cables. All of your cables need to be burned in, or broken in, a process similar to breaking in the engine of a new car. You need to use those cables for hundreds of hours before you’ll get the best listening experience. And if you don’t want to take the time to do that yourself, you can send them off to companies who will burn them in for you. For a fee. Or you can drop $1,000 – $2,500 to buy a fancy box with many connectors on it that will do it in just a few hours.
I learned that you can’t just run your $1000 per foot speaker cables along the floor. Oh, no. That would be too – too common or something. You need to buy $350 each cable clamps to hold your oh so special cables up off your oh so common and dirty floor.
I need to buy “quantum stickers” at $100 a pop. A lot of them. And stick them on every component in my amplifier and on my cables because they will – well, I’m not sure what they really do, to be honest, but they do something, as confirmed by several dozen glowing reviews from Bob and Stacy and George and others. And, well, come on, Stacy wouldn’t lie to me, now would she? Of course not.
One company sells, for about $150, what for all the world looks like a small block of wood with a logo laser etched on it, and claims that if I glue that sucker inside of my amplifier, many special “nanocrystals” embedded in the wood will do something that will align some kind of quantum field and do mysterious quantum things to the components in my stereo and make it sound better. And all just from being glued to the case! I know it’s hard to believe, but Peter down in the comments section says it made an astonishing difference to the sound.
Wow. Amazing. I need to get me one of them right away.
I could go on and on about things like $1,500 power strips, $250 outlet covers to put over the outlets in your wall that somehow “align the magnetic fields” or some nonsense. “Power conditioning” gadgets selling for thousands of dollars that are supposed to somehow filter out – something that will degrade your “listening experience”. Several places will sell you gadgets for several hundred dollars that will “demagnetize” your CDs.
And all of it is surrounded in sciencey sounding technobabble about quantum this and nano that and aligning quantum fields and… Oh dear lord I can’t stand it any more. Let’s talk about…
The internet immediately exploded into a tsunami of hype the moment CBS announced it was making a sequel to Star Trek Next Generation starring Patrick Stewart. But when, after all of the Star Trek fanboys came back from changing their trousers, it was learned that CBS would only be showing it on their new streaming service, there was much wailing and gnashing of teeth, but never mind about that, I want to talk about the whole Star Trek thing and Picard because CBS recently made the first episode in Picard freely available on YouTube.
Now the first question that came to mind when CBS did that was, well, why release the premiere episode for free on YouTube? The series has been streaming for a while now and the whole Picard thing was, if we are to be honest, a blatant ploy by CBS to try to force people to subscribe to its streaming service. They apparently believed that there were so many ST fans out there that they would subscribe to the service in great hordes. So the only thing that I could think of is that they were doing it because Picard hasn’t been doing anywhere near as well as they thought it would and they’re trying to pump up the viewership numbers.
Despite the fact I used to be a Star Trek fan, I wasn’t all that interested in Picard. I expected it would be a cheap ST ripoff being produced solely to draw subscribers to a streaming service. I was a fan of STNG when it first came out, and since it’s available on Netflix and Amazon video, I decided to take another look at it a few months ago, hopefully with a more impartial frame of mind than I had when it originally came out and, frankly, it was – unpleasant.
Now I knew there were going to be awkward moments in STNG when I watched it again. The show is now 33 years old, for heaven’s sake. The first episode aired back in 1987. I expected it to look dated, and it did. Often badly so. But what I hadn’t expected was that it would be actually painful. Plots were full of holes big enough to fly a galaxy class starship through. The show was self contradictory, often ridiculously so. It was preachy and holier than thou, especially during the first season. The aliens were, frankly, ridiculous for the most part. And every time Wesley Crusher appeared I kept hoping Picard would strangle the little weasel with his own intestines. And how many times did someone pull a deux ex machina out of their asses to save the day by ‘rerouting the plasma stream into the auxiliary conduit’ or some similar sciencey sounding gobbledygook? I found myself hoping the Borg would win and bring it to an early end.
I started to feel that STNG was the onset of dementia for the ST universe, Voyageur took it into the nursing home, the movies shifted it into hospice care, and finally the abomination that is J.J. Abrams drove a stake through it and turned it into just another SF shoot-em-up.
Now don’t get me wrong. I like SF shoot-em-ups. The new ST movies are fun. As long as you forget about the whole Star Trek universe that existed before Abrams came along and take them at face value.
Wait, I was supposed to be talking about Picard, wasn’t I? Sorry, I get easily distracted. Let’s get on with this.
There Will Be Spoilers. You Have Been Warned
Do I really need to say that? I suppose I do lest some poor lost soul who hasn’t seen Picard or hasn’t seen the hype and nonsense on the internet comes along.
First, this is a Big Budget production. Capital “B”. The cinematography, set design, CGI, everything about it is pretty much top of the line. It is beautifully filmed and edited by some of the best craftspeople, editors and videographers out there.
Unfortunately, the sound absolutely sucks. At least on the YouTube video. Seriously sucks. Volume levels go from hardly audible when normal conversations take place, to ear splittingly loud when something important happens. I had to keep one hand on the volume control through the whole thing.
But on with the story…
Picard is an elderly, angry, depressed, disenchanted man, living on the family vineyard, suffering from dreams/hallucinations and, after the first scene at least, I started to wonder if he was suffering from dementia. He lives on the vineyard with a dog and two Romulans who seem to be his employees/friends.
Switch now to Boston for no apparent reason, where we find a young woman with her boyfriend, who apparently hasn’t heard of The Hair Club for Men and has hair made of bad plastic and the usual “he’s an alien so he has to have a weird face” syndrome. And that hair… I’m sorry, but I just can’t get that hair out of my mind because, I swear to God it looks like they glued coffee beans to the poor guy’s head.
They’re sharing a romantic moment when three masked assassins teleport into her apartment, immediately kill the boyfriend, start beating her up, put a bag over her head and…
And then she turns into super-ninja, taking out three trained assassins in less than a minute.
And as she cradles the head of her murdered boyfriend, coffee beans and all, she is thinking of – of Picard?
And it’s just so contrived, so overly dramatic… Stewart’s performance seems forced, uncomfortable, awkward. Now I know the fellow is like a gazillion years old, but come on, the man is still a good actor, but this performance certainly doesn’t demonstrate that ability. The only time he shows anything that looks like real emotion during the entire 47 minutes is during the brief interview with a reporter that they had to shoehorn in in an attempt to try to explain WTF happened that screwed things up so badly during the last 20 years.
And then we go through a lot of maudlin stuff where Picard visits some kind of museum where all his stuff is being kept for no apparent reason except, of course, to be all poignant and try to remind people that this is the real Star Trek, not the abomination created by Abrams I suppose.
Meanwhile the girl is sitting huddled on a street somewhere, calls her mother, who tells her to “find Picard”, and she does in a sort of computer hacking scene to make sure we know that she is “special”. And she meets him again and he tells her she’s Data’s daughter and then in a dramatic action scene straight out of a bad kung fu movie, her and Picard get attacked by more masked assassins, she kicks ass, and then one of the assassins kills her by- by spitting on her????
But she’s Data’s daughter. And Data’s offspring can only be twins because, well, because of “reasons”, so there’s another one of her, somewhere… And before we roll credits and shut the episode down, we find her twin is living quite happily with the Romulans, who apparently have moved into an old Borg cube…
What? Seriously??? Where did I put that face palm graphic…
MrsGF and I were coming back from her sister’s place and we saw this. The photos don’t do it justice. That sunset almost looked like an atomic bomb going off, lighting up the whole horizon with that single shaft of light extending up. We had to pull off and just stare at it for a while because we’d never seen anything like it before.
Sunsets and sunrises (when we can see them, usually the cloud cover is too thick) have been spectacular of late. I imagine that’s due at least in part to so much particulate matter being in the atmosphere at the moment because of all of the forest fires we’ve been having worldwide.
As far as the weather goes, well, it’s winter, and we have some snow, as you can see from the photos, but it has been, well, weird. Just like 2019 was. Temperatures have been well above normal this winter. So much so that the ice fishermen have been getting nervous because they can’t get out on the lakes. This late in the season the lakes and rivers should have enough ice that you can at least walk out on the ice, and in some cases even drive a vehicle out. But you couldn’t pay me enough money to make me risk walking out on the ice this year. Most of the rivers and streams are still mostly open with almost no ice at all.
Ice fishing is a Big Deal around here. Generally as soon as we get a couple of inches of ice on a lake you’ll see little huts springing up or guys in cold weather gear huddling over holes drilled in the ice hunting for elusive panfish like bluegills and crappies. They endure it because one, they think it’s fun, and two, well, if you’ve ever eaten a freshly caught pan fried bluegill or perch, you know why they do it.
But The big event around here in mid winter is sturgeon season on Lake Winnebago. During sturgeon season there are thousands of people out on that lake, with hundreds of cars, 4 wheelers and snowmobiles, hundreds of ice shanties full of people huddling over holes in the ice hoping to get themselves one of the biggest fish you can get in Wisconsin. These things get to be five, six feet long or even bigger, and can be well over a hundred years old.
But we need ice for that, and we don’t have any. Or at least not enough ice that you can trust it. Unless we get a cold snap that really freezes things up, I’m not sure if there is going to be much of a sturgeon season this year.
While it may be winter outside, MrsGF’s rose in the living room is blossoming again.
I have no idea how she does it, but I’m not complaining. Having roses growing here in the middle of January is huge fun.
The Great Radio Fiasco ProjectUpdate
Considering I’m lazy and about the most unambitious person around, I bet you figured I’d sort of conveniently “forgot” about that whole thing, didn’t you? Ha! I wish! Sometimes I’m more stubborn than lazy, though, and when I get a bug about something I get a bit obsessed, and that’s what happened here.
Anyway, that hasn’t been going very well because of stuff like this –
One of the first things I discovered when I started doing some research was that I pretty much had none of the parts I was going to need. I may have had hundreds of diodes, capacitors, resistors, potentiometers, transistors and other goodies sitting on the shelf from other projects, but it seemed that none of them were what I needed for building any kind of radio receiver except for the most basic of items. So once I decided more or less on what kind of radio I was going to build, I had to order some parts. And as you can see above, sometimes it doesn’t go so well.
The main project is going to be a multi-band shortwave receiver, but I was also going to build an old fashion 1960s style AM transistor radio which uses a ferrite rod wound with wire as an antenna. What you see in that photo above is what was in the package when I opened it. Sigh… Don’t get me wrong, though. I order a lot of parts, and the vast majority of the stuff gets here in perfect condition. But every once in a while something like this happens, and all you can do is just sigh and go on. It doesn’t pay to try to do anything about this in this case. I only paid about $10 for them, the company is in China, and any chance of getting a refund or replacement is so slim it’s not worth the effort. On the plus side one of the rods is relatively undamaged with just a chip on the end, so it will work well enough for the AM radio.
But it does help to illustrate one of the problems I’ve been having, which is tracking down various parts. The days of being able to go to a local electronics or radio repair shop, or even Radio Shack, and picking up a couple of capacitors or an opamp or whatever are long gone. While I still do have a local Radio Shack (how I don’t know, but I do), it only carries the most common types of components, and I already got those by the dozens.
I need a germanium diode for one radio circuit I’ve been tinkering with. Do I have one in those boxes on the shelf with hundreds and hundreds of diodes? Of course not! The one I need is the one I don’t have, of course. And, well, you generally can’t order just one. So I ended up spending something like $15 to buy 50 of the dopey things. It’s like the robot vacuum cleaner I repaired a few years ago. I needed one tiny, tiny screw that held on the side sweeper brush. That was all that was left to fix it, just attach that stupid brush. Do you think I could find that damned screw? No. No one locally had it. I checked hardware stores, Radio Shack, auto parts stores, no one had one even close. I started looking online and found I wasn’t the only one having trouble find it. I finally did get one, but in the end the only sources I found for it sold them only in lots of 500. So I ended up paying something like $25 to get a single screw, and I now have a whole bag full of 499 tiny, tiny screws sitting in a closet somewhere that I’ll never use for anything else.
The same thing is often true of electronic components. You can’t get just one or two, you have to buy in bulk sometimes, and you end up paying $25 or $40 for a whole box of parts just to get one $0.75 component. The end result is that while the cost of the individual parts for this project is pretty cheap, I’ve ended up spending a significant chunk of money on this already because I often can’t get just one or two, but have to order in bulk.
But enough with boring you with that. Once I get further along with the radio thing I’m going to split it off to its own web page so it doesn’t clutter up the blog.