Finished the simplified circuit, parts list is the same with the exception of the 4N35 optocouplers and sockets plus proto boards. This replaces the 4 channel relay board. Both methods work well so It’s just a matter of preference. I have not had any problems with either one but proceed at your own risk. Will show a picture of the new version which is a little less cluttered, I used two separate proto boards to split up the two functions SMPS standby and LED amp enable. So now need to set back and enjoy. Thanks again for all the help, at this time it is one of my favorite amps.
JimM
I am planning for multichannel amp with Purifi and NC122MP modules. I‘m hoping to use 5V from standby SMPS on NC122 module to turn on 1200A400 SMPS. Would you change any of the circuit here, I mean change any of resistance values for using 5 V supply.
Thanks
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