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November 26, 2022, 05:28:32 PM

Author Topic: Trigger output  (Read 198 times)

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Offline barbz

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Trigger output
« on: April 22, 2022, 01:22:23 PM »
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

Offline Paul Birkeland

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Re: Trigger output
« Reply #1 on: April 22, 2022, 04:10:48 PM »
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.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline barbz

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Re: Trigger output
« Reply #2 on: April 23, 2022, 05:58:03 PM »
Thanks Paul,

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

Thankyou
Paul

Offline Paul Birkeland

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Re: Trigger output
« Reply #3 on: April 23, 2022, 07:15:07 PM »
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.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man