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any decent 12Vdc power supplies that can be used as a 12V trigger?

I went online and purchased a 12Vdc power supply to use as a trigger plugged in to a smart plug. I noticed after trying it the 12Vdc power supply was actually putting out 17,4Vdc not 12 and also noticed when shut off or unplugged it takes a while for the supply to shut off/ discharge. Anyone have 12V trigger power supply suggestions? 

Thanks

rbull11
kijanki's avatar
kijanki
4,443 posts
 

Are you asking about +12V trigger for power supply sequencing?  If so, devices have their own internal pull-up to 12V and are being shut down by pulling it down to GND.  I had one power amp that required more current to pull to GND than pre was able to deliver and had to put Normally Closed optical switch in series.

rbull11 OP
41 posts
 

I have a Micromega M-100 and I want to use a 12Vdc power supply plugged into a smart plug so I can use as a sleep timer. The Micromega has a 12V trigger 

kijanki's avatar
kijanki
4,443 posts
 

I believe that your integrated should work without anything connected - it pulls up trigger input internally.  In order to shut amp down you need to short this input to GND (or at least to drop voltage below 5V).  likely you don't need any external voltage.

rbull11 OP
41 posts
 

From my understanding, The Micromega M-100 has a 12V trigger input, I need a 12V source to trigger it. I was going to plug a 12V power supply into a smart plug and control it with Alexa ( So I'd have a sleep timer )

kijanki's avatar
kijanki
4,443 posts
 

Your amp will work, even without anything connected to trigger input.  Yes, amp turns ON with the presence of +12V, but this voltage is already there (pulled-up internally to 12V).  Try shorting this input to GND - it will turn your amp OFF while removing short will turn it back ON.  All you need is switch.

 

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