Purely academic question: I have a little bridge rectifier made out of four 1N4001 diodes, being fed by a transformer putting out 12VAC. When I run it without anything else attached to it, the waveform looks like this:
If I stick a 10K resistor on there as a dummy load, that junk in every other cycle goes away:
What gives? Is there some capacitance in the diodes or something? And why is it every other cycle?
(I know my scope can take screenshots; I just can't find my USB drive.)