It is a good thing that miracles occur and circuits begin working. Otherwise some problems wouldn't ever be resolved. :)

Weird, I was trying to post an EESE link.

just as well. I was on a rant anyway.

@Marla That's interesting - he says the scope is picking up harmonics, but if you count divisions, I see a 10kHz signal

@W5VO ..yes that is true. But he doesn't take guidance too well. He needs a CT. But he does seem to be persistent in wanting to do induction heating.

@Marla I'll bet you $0.10 that he's not even driving his bridge correctly

And for posting links, if you don't want them to expand to the actual post, just type something else in there (in addition to the link)

@W5VO OP is getting close. He could hear the system working when he inserted a work piece into the coil.

So probably 10 kHz