"Brian Gaff" wrote in message
m...
My subwoofer picks up. Mobile phones, radar pulses, clicks and bangs on
the mains and occasionally short wave radio.


The very short speaker wires from amp to speaker in the box appear to be
the culprits for the higher frequencies, and the input leads the way in
for the rest, except
The mains borne crap.

**Use sheilded cable for the speaker leads. It's a long shot, but I've found
that it can work with very high feedback, poor stability amps.


It has a three core mains lead of the iec variety, but its only been
doing these things since it had a new bridge rectifier fitted a while
back. I am suspicious that some capacitors may have been damaged when the
bridge went down, but I'd have thought this would just result in hum.

**Not necessarily. Most high feedback designs have prodigious PSRR figures.
Loss of one cap can go almost unnoticed, unless you test it on the bench.


The amp is built on pcbs maounted on the heatsink which effectively forms
the back of the cabinet beside the port.

Any ideas?

**A dedicated mains circuit would probably solve most mains issues. Other
than that, a complete redesign might be in order.


--
Trevor Wilson
www.rageaudio.com.au