Adding an idle off circuit

[ryanppax]

Hi all, new crack owner here.
Newbie to circuit design but not reading and implementing wiring schematics

I've found myself constantly forgetting to turn the amp off. I'll come back 8 hours later and its still on. So I've thought of putting a timer plug on, even a smart plug with an hourly auto off schedule. But that's no fun...

I'd like to implement something like an idle off circuit. My Modi DAC has something similar, I can hear the relay click on when I turn my computer on. So I'd love to trigger the power on of the crack to when audio is detected, and turn off after some period. Also some power button (non toggle) to function the same and drive a mains relay.

[AllenS]

There is an older thread on DIYAudio discussing this which maybe of interest.
https://www.diyaudio.com/community/threads/standby-auto-off-on.312319/

[Paul Birkeland]

Can this be done?  Sure, I suspect this is quite possible.  The bigger questions will be how you plan to power it, where you're going to fit all that circuity, and how much noise it's going to add.

[Doc B.]

We use an Echo Dot and a smart outlet for hands free power control of our dining room system.

Maybe an indicator lamp would be enough to remind you that the amp is on? Might be a simple solution.