Hi all,
I have a Yaesu FT857 transceiver which requires a nominal supply of
13.8VDC. I accidentally fed it with 30VDC and something went 'phut' after about 60 seconds and there was a whisp of smoke. Nothing too dramatic, but it no longer works. I'd forgotten it has an on-off switch which doesn't entirely isolate the supply. The thing was switched off at the time this happened so whatever's burned-up must have still been connected internally despite that. I'm guessing this radio will have some kind of over-voltage protection built in, but how is this protection typically implemented? Is there anything to particularly look for?-CD