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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

Showing 3 responses by kijanki

kijanki's avatar
kijanki
4,445 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.

kijanki's avatar
kijanki
4,445 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.

kijanki's avatar
kijanki
4,445 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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