Ask HN: How do I learn practical electronic repair?

He buys cheap crap, takes it apart, and usually infers a schematic. He also admires or critiques the designs. After a while you'll notice patterns.

Very good bet.

You still have to beat the odds a lot of times beyond that, since some things are just plain fubar and can't be fixed :\

Others which can just barely be fixed often rely on equal parts luck and skill, I'm the first to admit.

I like the idea of learning how to build for a bit, before migrating more seriously toward teardown & repair.

A really good start is to build a few simple hobbyist kits that run on 9 volt batteries.

You may just get blinking LED's or a buzzing speaker but everything is in the kit and you get the experience with individual components.

You can gain a lot that way without even trying to understand theory, but one of the best ways to develop understanding is to go back to a project you have built from the ground up, and then research each of the elements that you have already been successfully working with until you reach full understanding or at least a satisfactory plateau at that point. Simple discrete components are probably best to develop great confidence with, before trying to deeply study the internals of integrated circuit "chips". It can also be a lot more meaningful when it's your own project you are learning basic theory about, or even the most advanced equations. If you concentrate on a limited area, it sure is more within reach than learning everything you need for a degree.

The main "academic" thing that you can not skip is constantly learning how to better read & draw schematics.

You will definitely be more quickly able to "turn something that doesn't work" (never even was working!) into something that works if your success rate is nominal.

Every project like this is helpful as long as you are continuing to learn, Once you have built a simple kit you may later want to revisit the device and construct a "duplicate" from entirely recycled components that you must first remove from scrap circuit boards. If you do the math these can be some of the most affordable components :) Also flexes your un-soldering ability. All without electronic theory, but it's there for the asking any time you want to dig deeper.

You will use all that experience to better repair things when they need it, especially the simpler problems which may not be the most abundant but it's nice to have them under control. Gaining more intuition about electron flow in general through experience will be more rewarding through time.

While escalating your abilities when your ambition moves beyond 9 volts.

More care than needed will get you a lot further than less care.

Reminds me of the comments I read on a video of somebody doing something unsafe - "safety squint".

>It's usually something stupid.

Like trunk mounted car batteries in ICE cars.

Where the one long copper positive wire reaching up to the engine is longer & thinner than it should be, the short ground wire goes to some sheetmetal in the trunk, and that current eventually makes its way to the starter indirectly through a maze of non-copper pathways through the frame of the vehicle.

Then under ideal conditions the starter never sees more than 11 volts :(

Not even the full 11 volts when the lug in the trunk is painted over before connecting the terminal during assembly :\