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ryanrs posted:It's possible I could force them in with hot air, but I think I'll just order some new boards. It's 2-layer, so manufacturing time is quite fast. You couldn't salvage them with a hand drill bit?
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Jul 21, 2023 05:13
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Foxfire_ posted:Automotive power is typically pretty dirty with lots of inductive stuff dumping current. Having the "12v" line go up to 100v for 10-100ms isn't unusual What he said. Spikes as solenoids and motors activate/deactivate are the norm. Hell, car audio guys will install full farad capacitors on their amps to keep the headlights from dimming.
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Jul 24, 2023 01:46
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All this talk of isolation transformers made me think of one of my favorite facts about old radios. Before permanent magnets were invented, radios used electromagnets in their speakers. We take for granted how far we've come.
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Jul 25, 2023 01:20
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I suppose I should have said practical permanent magnets.
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Jul 26, 2023 18:08
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PokeJoe posted:have them speak into a 9 volt battery they can simply lick when lying That reminds me of a quick way to test Lightning cables. You can see if it's good for charging at least by licking them.
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Aug 2, 2023 21:30
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His Divine Shadow posted:How easy (or difficult) is it to change the color of the display on a unit like this? As you can see it's reddish. I would like it to be green to match the rest of the car. Is that an LCD or a VFD? Because you'd have to change the phosphor inside the sealed tube if it's a VFD, vacuum it out again and finally seal the glass. It'd be easier to just get a newer RGB head unit. You can pick any color you want with those via the interface.
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Aug 25, 2023 23:42
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Did you try hitting it? No, seriously. I bet there's a bad solder joint inside making the magic pixies jump the gap and causing the amps to go up. Does it act up (or stop acting up) if you give it a good thump? That would make sense if it only acts up after it's been on for awhile: it got hot and connections expanded.
kid sinister fucked around with this message at 04:38 on Aug 29, 2023 |
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Aug 29, 2023 04:34
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You know your electronics fixes are good when they involve a trip to the local auto parts store.
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Sep 3, 2023 05:15
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I hate early PCBs!!!! Seriously, 1950s circuit boards are an exercise in pain: lifting traces, warping, etc. I wouldn't wish these on my worst enemy.
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Sep 5, 2023 18:23
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Nice monsteras!
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Oct 10, 2023 17:23
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Pham Nuwen posted:Exactly! 6.3V is a common side tap for tube powered equipment, like guitar amps. I restore old radios. Any bulb over 3 volts these days will most likely have a drop in LED replacement. Most will fit in the housings for those old bulbs. Also, bulbs aren't picky about AC or DC. Most of those LED replacements will take a range of input too. You might just be able to drop them in and have them work. edit: Honestly, I'd just google "pilot lamp" and find one that you like. They come in all sorts of shapes and colors. kid sinister fucked around with this message at 22:39 on Oct 14, 2023 |
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Oct 14, 2023 22:31
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Foxfire_ posted:I would expect a 50 year old sewing machine to have little-to-no consideration for EMI. The 1970s was when the FCC started started clamping down on interference.
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Oct 16, 2023 22:55
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Bad Munki posted:The days of plumbing being a reliable source of ground are long gone. Yep. PEX is here to stay. You're only allowed to ground to metal water pipes now within 6 feet of the service entrance where those 6 feet can be visually verified. Also, depending on how your electric panel is grounded, couldn't you be making a ground loop? kid sinister fucked around with this message at 04:22 on Oct 24, 2023 |
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Oct 24, 2023 04:19
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The critical part would be the scope. To be small and cheap enough to fit in a kit, it would have to be something portable, like 1 channel for $80. I like the idea of putting all that stuff together in a proper hard case though.
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Nov 26, 2023 22:16
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His Divine Shadow posted:but I needed it working because it's time to start the christmas lighting. We're going to see this yard on YouTube, aren't we?
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Dec 3, 2023 22:18
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Cojawfee posted:The answer to "can I make my own for less?" is almost always no. Even if you consider your own time to be worth $0 an hour. Ain't that the truth. You're not buying parts in the thousands to get that sweet, sweet quantity discount like the big boys can afford.
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Dec 12, 2023 18:39
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Charles Ford posted:I only shocked myself once with 240V, but I agree it was the best as it made me make a cartoonish "ababababababa" noise and left a little scorch mark. 110V just felt like a strange little massage, thankfully I was not grounded. You're only a pro once you can tell the difference between AC and DC.
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Dec 16, 2023 00:44
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His Divine Shadow posted:What kind of symbol is this? First I thought a transformer, but it looks like an inductor? And L is also the symbol for an inductor. L1 I guess. Never seen something like this before however. I restore old radios. That's called an IF transformer. Shame Boy is right. These have ferrite slugs you adjust when aligning the radio. If you're lucky, yours won't be stuck! Edit: adjust it with something non conductive. They make cheap anti static alignment kits for like $20 on Amazon. kid sinister fucked around with this message at 21:08 on Dec 21, 2023 |
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Dec 21, 2023 21:03
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His Divine Shadow posted:I don't have the skill or equipment to adjust the ferrite slugs I don't have the skills either. I do it anyway. It's all about peaking voltages. It helps if you have an analog meter. It doesn't get simpler than "make needle go further right". I was just joking about the slugs being frozen. The most stuck ones I've ever twisted let loose with a mighty CRACK and turned fine after that.
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Dec 22, 2023 19:14
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Shame Boy posted:https://www.raspberrypi.com/news/we-let-the-social-media-team-design-their-own-frankenpi-5-and-it-is-beyond-horrendous/ Hey, I could use a Pi with a bottle opener.
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Dec 28, 2023 05:31
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ante posted:24v DC, not AC, right? That was my thought too, although 24VAC is common for several household uses, like your doorbell and HVAC signalling.
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Dec 30, 2023 00:43
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Meanwhile I just have my Hakko. Maybe I'm missing out by going cordless?
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Jan 4, 2024 05:39
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I hadn't even considered tip availability for these portable irons. They're no Hakko or Weller. Do they have anywhere near the tips of those two? I like my tips.
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Jan 4, 2024 06:16
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You're absolutely sure that you don't have the brake lights mistakenly wired into your head unit's wiring harness? Because the tail lights are 12V too. Maybe someone picked up the Reverse switch on the transmission selector wrong.
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Jan 4, 2024 22:28
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ryanrs posted:FYI, LEDs are one of the only things I will prototype/breadboard before committing to a PCB. You just have to see them for real to understand what an LED will look like. What, you don't like blinding customers? 
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Jan 8, 2024 07:32
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Rocko Bonaparte posted:(I already had a pile of resistors, capacitors, wires, and some cables, so I didn't order a bunch of those) There's no such thing as too many of those.
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Jan 12, 2024 15:41
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I just keep stacks of the little plastic baggies you get from Mouser and Digikey. It's... not ideal.
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Jan 13, 2024 07:48
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^^^^There is no such thing as too many jumpers.
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Jan 18, 2024 02:48
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Speaking of jumpers, who makes good multimeter probes and clips? Should I fork out the dough for a Fluke probe set for my Fluke multimeter?
kid sinister fucked around with this message at 05:06 on Jan 18, 2024 |
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Jan 18, 2024 05:02
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Foxfire_ posted:My good probes (spring loaded, crown tip, overkill if you aren't probing small things) are from https://probemaster.com Oh geez, they even make probes especially for back probing. Pro Tip: keep a package of sewing needles in your tool bag for back probing. They're as cheap as can be and in a pinch are sold in most stores. T pins are an alternative that are easier on your fingers, but you have to be more careful with the pins touching. It works great on weatherproof connectors, like in cars.
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Jan 18, 2024 05:23
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PDP-1 posted:Google for 'flexible light pipe'. Interesting. I assume these are just cheap set length fiber optics?
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Jan 20, 2024 20:26
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ryanrs posted:I love it! In my lifetime, fiber optics have gone from "state of the art" to "oh gently caress I forgot to panel mount my LED".
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Jan 20, 2024 21:45
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derk posted:looking for some help. This is very salvageable. I've seen much worse. FYI, those holes are called vias. Their job is to connect traces on different levels of the board.
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Jan 25, 2024 01:08
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derk posted:well, that is good to know! i didn't screw it up beyond repair Now the hard part: you'll need to work with the itsiest-bitsiest wire you've ever seen: 30 gauge kynar wire.
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Jan 25, 2024 03:56
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Bad Munki posted:
This is right. Cathode is where electrons come from. Electron flow is opposite of conventional flow. The way I remember it is thinking of old CRTs. They had an electron gun shooting electrons at the screen, the cathode ray.
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Jan 26, 2024 23:07
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ante posted:Yeeeeeah Don't tantalums catch fire if they're backwards?
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Jan 27, 2024 00:50
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ryanrs posted:But old HP stuff was hot poo poo back in the day This is the truth. HP test equipment was the top of the line for decades, up there with Techtronix for scopes. Like Techtronix, expect great documentation too. They changed their name more recently though. Or got bought out. I want to say Agilent? ryanrs posted:Lots of calibration sticker residue likely means it spent its life in a climate controlled commercial or govt lab, with yearly calibration. Also the truth. My VTVM still has its badge from the University of Oregon and I've never been to the west coast. Edit: v v v thanks kid sinister fucked around with this message at 21:13 on Feb 6, 2024 |
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Feb 6, 2024 21:08
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Should we hold a contest and see who has the oldest test equipment? I might win though. I got stuff from the 50s.
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Feb 6, 2024 21:18
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Feb 6, 2024 22:04
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| # ¿ May 20, 2024 08:29 |
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The only way to protect against a USBkill is with a locking cabinet.
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Feb 10, 2024 18:22
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