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I did try to replace each one of the ICs to see if it was misbehavior, but not really.
The light switch is very close to the power supply (plug and switch are on the same wall outlet).
Capacitors are surrounding the 7805 very closely, in addition to the usual bypass capacitors along the power...
Out of curiosity, here is another shot showing V before and after the 7805, with 2200uF on VIN/GND and multiple bypassing caps on the power rails at the inside:
Again the triggering was done by switching a nearby light on.
Okay, so I've run a few tests, with 10uF and 2200uF caps between VIN and GND, a a diode to isolate the voltage regulator from the supply, or a resistor in the same place, and took screenshots that triggered on the light switching. Lastly, I've also checked results with a ferrite bead for the...
Thanks for the hints. I've already tried the capacitors, even a relatively beefy one (220uF) between VIN/GND on the regulator, without much success. I haven't tried to isolate the supply with a diode yet, though. I'll try that and see how it goes.
I have a trivial circuit with a couple of ICs and NPNs working out of a 12V power supply and through a 7805 to get 5V, with bypass caps properly distributed across the circuit. I'm a bit surprised by the huge spikes being caused by outside interference in the AC line. Switching a nearby light...
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