Here is a teardown of a cheap car USB charger (few us dollars). It worked well for years, but started to be unreliable one day. So I had to take a look what is inside:
The issue seemed to be bad ground/- connection. A little bit of soldering could fix this..
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2 Comments
Tomi Engdahl says:
Somewhat related:
Crack Open a USB Car Charger to make it a Variable DC-DC Converter
http://hackaday.com/2015/08/13/crack-open-a-usb-car-charger-to-make-it-a-variable-dc-dc-converter/
[Boolean90] hacked a cheap USB car charger into a variable power supply. His proof of concept is to use this as a variable-speed motor controller. The best part is that nothing is being abused, the regulator inside is still running within manufacturer’s spec.
https://www.youtube.com/watch?v=2IOs3g-52Zo
Tomi Engdahl says:
Over few years of use this device started to become unreliable.
I found out the connection of – side contact to the circuit ground failing…
Maybe the mechanical construction of that could be better.