Trigger output

[barbz]

Hi all

In the process of planning out a new build (more play with a d class amp) and I was wondering if anyone had been able to add a trigger output to the more play.so that when the unit is powered on I can trigger the d class amp to power on.

Ideally this needs to be between 5-19v and terminated with a 3.5/2.5mm socket but I'm not sure where to source the power feed from without impacting the pre.

Thankyou

[Paul Birkeland]

You could try using one of the 6V6 cathodes as the trigger.  The fun part about this is that your class D amp wouldn't come on until the tubes were warmed up and playing.

[barbz]

Thanks Paul,

Would that be safe and not cause any additional loading on that circuit?

Thankyou
Paul

[Paul Birkeland]

You could give it a shot and see.  I don't believe that triggers use any meaningful amount of power, but there's always the possibility that you could introduce some noise. If that's the case, you could make a little rectified DC supply off the heater winding instead.