[sdiy] Hum Problem Kaput

[harry bissell]

--- Ingo Debus <debus at cityweb.de> wrote:
<snip>

> This was my first thought too reading Harry's
> comment. If there's a
> ground fault interrupter then you're fine, it will
> trip at some 30 mA.
> But if not then the fault current is really high,
> and goes through the
> thin shield of audio cables or even through PCB
> traces. Who guarantees
> that these won't burn long before the breaker/fuse
> notices?

Almost always... NO. If you like to try... take some
fine wire (maybe 28GA) and tie it across a switched 
outlet... then turn on the juice and see what blows..
the wire or the breaker. The breaker will win every
time

(note... if you do not have the wire in place first...
the resulting ARC could fry the wire... not the
current)

The wires can handle amazing amounts of power for
short periods. I routinely short and inverter power
supply
(800 KW) through a 28 GA wire. In the 10uS it takes to
shut down... peak current is over 200A in the wire.
And
it does not even get warm.

Longer times will mean lower current capacity... but.

The proper question is... do you like to try your luck
on ruining the mixer and the other gear ???

> > - If you unplug something from the mixer or
> central ground (say, if you decide to
> > patch into another channel, you are leaving
> unpatched gear ungrounded, making
> > it unsafe! Or you might get a few sparks while
> repatching, as you only had a few
> > volts difference....
> 
> Another valid point.

Ouch.... agreed !!

H^) harry


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