In article , Norman
Billingham
norman.at.tumulus.org.uk wrote:
I have a pair of ATC SCA50 active speakers. They make a great sound but
the amplifiers run all the time, even when there's no signal to
amplify. Since they run in class A there is a significant current draw
24/7. As they are at opposite sides of the room, turning them off
involves two switches and doesn't get done unless we're going away.

Do any of you experts know if something like the Velleman 4700 would do
the job? Or of any other circuit? I'm perfectly happy assembling
something but I'm no circuit designer.

The simplest approach might be the best. In situations like these I just
use a switched mains disribution board, or a board with a 'torpedo' switch.
Choose a board with an indicator if the ATCs don't have any. This way you
can switch the preamp/source on and off at the same time if you want.

Slainte,

Jim

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