David Cutter wrote:
It sounds like a malfunction in the start-up circuit. How is the psu
switched off? My guess is it is not an isolating switch on the
supply input, but some low power circuit that sends a signal to the
start-up circuit. This is not an area to be tackled lightly, as it is
at mains potential. Over here that can be lethal, but still be
careful how you investigate.
Thanks for the advice, David.
I'll trace out the circuit when I finish my current project (time is
tight right now) and do some troubleshooting. Having learned electronics
as a kid back in the tube/valve era (radio and TV broadcast in the late
1950s and 1960s), I tend to be wary around AC and high-voltage circuits.
I worked as a transmitter engineer one summer between semesters at
WEAN/WPJB-FM in Providence, RI. The chief engineer impressed the
importance of caution around such circuits by showing me a picture of a
"fried" engineer who had gotten across the HV in the 5KW AM walk-in
transmitter at the site several years earlier. That made a lasting
impression on me for sure.
Cheers,
Gus Hansen
KB0YH
_______________________________________________
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
