ej_whyte
Well-known member
I would like to make a sort of auto sensing relay circuit to switch between input. The situation is that I have a pair of RCA jacks on the back of a unit, and a 3.5mm on the front panel. I would like the audio from the rear panel RCAs to be default, but when a signal is fed/jack is plugged in to the front input it automatically switches to that source.
This could done with a switching jack for the front panel, however I would like to avoid dragging the rear input signal all the way to the front panel to pass through the switching contacts, so I am thinking of a relay to switch between the two inputs, in the middle of the unit to minimise distances.
I think the auto switching could be done with a comparator on the front panel input, which outputs a CV for the relay when the signal is above the threshold. The only problem I could see with is the relay inadvertantly switching back during a short pause in the audio, but this could be resolved by a 10 second or so delay for the relay switching back. Ideally I would like it to auto switch when the jack is plugged in, but I'm not sure of a way to this without running a CV through the jack?
Thanks
This could done with a switching jack for the front panel, however I would like to avoid dragging the rear input signal all the way to the front panel to pass through the switching contacts, so I am thinking of a relay to switch between the two inputs, in the middle of the unit to minimise distances.
I think the auto switching could be done with a comparator on the front panel input, which outputs a CV for the relay when the signal is above the threshold. The only problem I could see with is the relay inadvertantly switching back during a short pause in the audio, but this could be resolved by a 10 second or so delay for the relay switching back. Ideally I would like it to auto switch when the jack is plugged in, but I'm not sure of a way to this without running a CV through the jack?
Thanks