"Ian Bell" wrote in message
...
David Looser wrote:

There shouldn't be "god awful current spikes" unless the conduction angle
is excessively short, which isn't good for the transformer, the
rectifiers or the capacitors. Since both the a.c. conductors are,
presumably, co-routed, the magnetic fields will very largely cancel
anyway.

Well, if you aim initially for 10% ripple then that will be the conduction
angle to a first approximation and the current spikes will be 10 times the
load current.


You were talking about a 200mA DC load, so how big are these spikes then? 3A
peak maybe?. hardly sounds like "god awful" to me. And you can use a twisted
pair for the ac so that the magnetic fields cancel out. I presume you are
not running the power cable close to the audio wiring? Are you using a
low-impedance balanced audio input to this amp of yours? if not I suggest
that doing that will make far more difference to your hum levels than
worrying about ac in the power cable.

David.