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Ask HN: How do I learn practical electronic repair?

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Re: Ask HN: How do I learn practical electronic repair?

#31
No affiliation; happy customer:

https://hifiaudio.com/

Their kits come with a helpful pamphlet. I have an old hi-fi with a few annoying component failures I’d like to fix.

I’d say they’re intermediate difficulty. I’m going to start with some soldering practice kits, lightbulb replacements, and pot deep cleans. I’m reasonably confident I can get that done without killing my stereo.

Re: Ask HN: How do I learn practical electronic repair?

#32

I've got a friend who has been at this since learning in TV repair shops in the 1950s. His emphasis is always on fast turn-around. He doesn't believe in slowly turning on things with old electrolytic capacitors, for example. I've learned quite a bit from him. I've learned not to fear B+, but to give very healthy respect to anything more than 500 volts. (Only use 1 hand, keep the other behind you, always have a safety…

> give very healthy respect to anything more than 500 volts

Man, I'd say be very respectful to anything that might be running 120-240V, and be very sure about anything higher than that. Anything <50V can often just be fun tinker whatever assuming you're ok with breaking whatever you're playing with, up to a certain max amperage of your power source. High amperage but low voltage can still cause some serious messups if you don't have the right fuses in place. But I get other voltages are common in Europe.

Re: Ask HN: How do I learn practical electronic repair?

#33

If you want to git gud? Find some popular piece of electronics with a fatal design flaw that’s trivially fixed with some basic rework that you can flip for $25-$1200. Do this a hundred times. Branch out. This changes year to year but could be fixing joycons, reflowing bga’s, upgrading soldered memory on newer laptops, doing case swaps on consoles or smartphones, and as others have pointed out, lots of automotive, vin…

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Re: Ask HN: How do I learn practical electronic repair?

#34
One way to learn in a very hands on way would be to start building 'hobby' type quadcopters in the 5 to 10 inch propeller size class, such as are built on frames that are cut out of common carbon fiber plate, and use flight controller / ESC stacks in the 'standard' 30x30mm size.

Re: Ask HN: How do I learn practical electronic repair?

#35

I've got a friend who has been at this since learning in TV repair shops in the 1950s. His emphasis is always on fast turn-around. He doesn't believe in slowly turning on things with old electrolytic capacitors, for example. I've learned quite a bit from him. I've learned not to fear B+, but to give very healthy respect to anything more than 500 volts. (Only use 1 hand, keep the other behind you, always have a safety…

> give very healthy respect to anything more than 500 volts Man, I'd say be very respectful to anything that might be running 120-240V, and be very sure about anything higher than that. Anything <50V can often just be fun tinker whatever assuming you're ok with breaking whatever you're playing with, up to a certain max amperage of your power source. High amperage but low voltage can still cause some serious messups i…

Nah, 120v ain't so bad. Hurts less than hitting your finger with a hammer.

Re: Ask HN: How do I learn practical electronic repair?

#36

Earlier quoted context omitted.

> give very healthy respect to anything more than 500 volts Man, I'd say be very respectful to anything that might be running 120-240V, and be very sure about anything higher than that. Anything <50V can often just be fun tinker whatever assuming you're ok with breaking whatever you're playing with, up to a certain max amperage of your power source. High amperage but low voltage can still cause some serious messups i…

Nah, 120v ain't so bad. Hurts less than hitting your finger with a hammer.

I'm not necessarily talking about getting shocked (which can still end up being bad), I'm also referring to the fact a lot of those 120V circuits are probably only protected by something like 12-15-20A of circuit breakers that might take a while to actually blow and unless you're in a kitchen or a bathroom or whatever probably don't have GFCI protection. Messing something up can quickly lead to quite a fire.

Re: Ask HN: How do I learn practical electronic repair?

#37
I repair practically anything that breaks in my house -- except heavy work on the car, or the roof. A few things, from me as a kid:

1. Take things apart, and try to figure out how they work. Don't worry too much about getting them back together. But then, trying to reassemble it is good practice too. There's plenty of old electronic junk that you can explore before throwing it away. Build a mental catalog of how things work and are assembled. Among other things, this will help you when you need to come up with a strategy for getting some particular gadget open -- often 9/10 of the problem.

2. Like others have said, YouTube is great. People will make a video of a repair, or even just getting something open, for a few "likes." Also, most of them are just normal genuine people who aren't trying to be influencers, so it's kind of culturally refreshing. Many of my successful repairs started with YouTube, such as my clothes washer and dryer, refrigerator, lawn mower.

3. Many of my most cherished tools are what I call for "demolition," not electronics specific, like picks, pry bars, a slim knife that can get between things, stuff like that. Another set of cherished tools are my magnifying visor, small magnifying glass, bright flashlight, and a stereo inspection microscope that I got second-hand.

4. A lot of "electronic" failures are actually mechanical in nature, and you can just use your general troubleshooting rundown to figure them out. Switches, connectors, cables, etc.

5. Begin to get the hang of identifying parts, and how part numbering schemes work. It will help you in your search for spares.

6. These days I often ask my spouse for a opinion. She's a laboratory scientist, quite sharp and skeptical. I'll have a hypothesis, and she asks the one question that blows it out of the water.

Good luck! Don't get electrocuted or burn your house down.

Re: Ask HN: How do I learn practical electronic repair?

#39

Earlier quoted context omitted.

> give very healthy respect to anything more than 500 volts Man, I'd say be very respectful to anything that might be running 120-240V, and be very sure about anything higher than that. Anything <50V can often just be fun tinker whatever assuming you're ok with breaking whatever you're playing with, up to a certain max amperage of your power source. High amperage but low voltage can still cause some serious messups i…

Nah, 120v ain't so bad. Hurts less than hitting your finger with a hammer.

I would not want to touch 120V with wet hands, for example...
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