Generally at 12 volt trigger is just that. It may take a range of voltages maybe down to 9 volts but they're designed for 12 volts and most preamp/processors output that voltage. You can just use a 12 volt wall wart to test trigger. In our amplifiers we use a trigger Jack which has a normal contact which goes to a 12 volt supply and supplies trigger when there's no trigger cable or when a trigger cable is plugged in takes a signal from that cable. The nCore module does not have a 12 volt output but it does have auxiliary voltage output of plus and minus 17 volts on pins 1 and 2 of J6 which can be regulated down (they don't come on until the SMPS is enabled though - a catch 22). Or the 5V standby supply can be used. The SMPS enable can tolerate up to 12v. See the data sheet. The main power switch can go in series with this trigger signal. We use a microcontroller for this interface, which is programmed to do a lot of other housekeeping and control stuff.
Can't you drive the relay through a pass transistor from the standby supply, which is good for 1 amp?
The min current of the 5V signal from the source trigger would need to provide the mA.
Huh? A pass transistor is specifically used to allow a higher current component to be driven from a source which cannot supply much current.
My bad. Read it wrong. I'll look at that route as well. Thanks!
Omron is the one I found but has the high draw. I dont want to get anyone's hopes up. If I can find an easy way to incorporate a 5v compatible trigger I absolutely will
Either way you go, stick a reverse biased diode across the relay coil - the back EMF upon deenergizing can take out some upstream circuitry.
Wow, that seems perfect for users. Thanks!
