> The inductive spikes are getting out through poor diodes, and the > transistors were a red herring. The machine was made to make noise, and > that's what it does.
You might be able to minimize the spikes by putting an RC damping network (snubber) across the primary of the transformer (between the collectors of the transistors). This is what is typically done with triacs and SCRs to lower the level of flyback transients. I also found a lot of power supply schematics that put the snubber across the secondary instead. > So I was looking at constructing a mains filter to test this, and see if > that would solve it. If the problem is just "conducted" RFI, that might help. But if it's "radiated" from all the inductors, that won't make much difference. Better to lower the level of the source. -=-=-=-=-=- "http://www.dibsplace.com/design/"; -=-=-=-=-=- DIBs Electronic Design | Dave Baldwin Adapt and overcome. | Buy a book and read it. -=-=--=-=--=-=--=-=--=-=-=-=--=-=--=-=--=-=--=-=--=-=-=-=- -- Author: Dave Baldwin INET: [EMAIL PROTECTED] Fat City Hosting, San Diego, California -- http://www.fatcity.com --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
