I know no one can tell me exactly why, but someone can at least give me some thoughts here. Ok, my problem. First of all, when I set my Tek 475 to2mV/div, 200MHz BW with an open circuit probe, I get about 20mV (it's a 10x probe) of noise, primarily at approximately 90MHz. I've tried turning off basically everything in the house and that hasn't stopped it. (Amazingly, I didn't see any change at all when turning off my computer and monitor just five feet away!)
So I've reassembled my medium power induction test circuit.
When I turn on the drive circuit,
I tried sniffing around with a balanced twisted pair with 1" dia. loop on the end, but that didn't tell me much besides the circuit is somewhere radiating noise...no shit!
-- Deep Fryer: a very philosophical monk. Website: