Quote Originally Posted by Michael View Post
Yeah, I thought on the secondary side the noise level would be down quite a bit...plus just a simple 1N4003 in series with a good resistance 10k, 47k something like that. Some high freq filtering perhaps.

I'll look at it on a scope and create some noise myself....grab my power drill or something.

I think only something like a refrig would be a problem and it would depend on it's design as well.....and if it was on the same circuit.

For you real software gurus, I suppose I could maybe even just look for the 1 second during a shorter window of time? (and ignore everything else)?

...Hmmm
Why not combine old and new technologies for a solid timebase.

Have a PIC triggered off the mains freq, and to keep it from false-triggering due to a fridge kicking in or something, have the PIC wait at least 16ms (at 60hz) before it'll even think about accepting a new trigger...or something along those lines...