Electronics > Beginners
I feel I should know this but I don't
frozenfrogz:
In regard to reverse engineering a PCB I would advise to put the board on a flatbed scanner and do a high resolution scan of both sides.
Afterwards you can re-draw the traces and create an overlay of both sides. This only works for double layer boards of course..
JS:
Even with the low voltages a DMM would provide you could put a sensitive junction in everse bias and while unlikely to burn it, low noise transistors can loose the low noise characteristic when reverse biased. Other than that is pretty safe, like in no low noise circuits
JS
tooki:
--- Quote from: eKretz on July 20, 2018, 10:16:14 pm ---If you aren't careful. Shorting the wrong pins together by bridging them with a single probe (which is easy with the tiny ones) while they're under power can do damage. Just correctly probing pins with a multimeter is unlikely to hurt anything.
--- End quote ---
^^^ this. I’ve damaged stuff while probing around just to understand the circuit, with a slipped probe that shorted two pins. :( Don’t be me, be more careful!!
Discotech:
Thanks for the advice, I've managed to find a schematic for the board I was going to probe so I no longer need to probe :-+ but at least I know in future
Richard Crowley:
With full knowledge of the CONTEXT, there are pretty reliable ways of figuring out which is the circuit ground/common pin, and working out from there to find the power bus(es), which are input and output terminals, etc. There are many videos on YouTube showing reverse-engineering techniques, from figuring out the basics (Ground, Power, inputs and outputs), through discovering internal serial terminal nodes, and offloading firmware code and reverse-engineering and hacking the code.
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