Great tips. I should have done more ohm-meter testing of my power rails on a recent project. A 12V input rail and the 5V regulated output rail that ran side by side (by the LM78L05 regulator) and were shorted, on two different occasions (from sloppy soldering when re-working the board) resulting in two dead ATmega328 chips. Not the most expensive mistake in the world, but certainly frustrating. I learned to check the resistance between all power rails and ground.
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