Optocoupler to "mute" output

[lukatosh]

Hello! Best regards from Chile.

I'm working on a Junction Box with two guitar inputs. They are selected by pressing a switch and using relays and a arduino.  I would like to add a second switch to act as a master mute.

During the activation of the relay (to select betwen the two inputs) i use an optocoupler (TLP222G) to suprres the "click" sound due to the mechanical activation of the relays. So i would like to know if there will be any issue if i use the same opto to shunt the signal to ground as my "mute" mechanism instead of adding another relay.

On the breadboard it works but i would like to know if i'm missing something... Maybe at some point, with a hot signal, the opto could be damaged or perhaps the opto can do this only for a short time ... I would like to learn... On the datasheet, which data do i need to look to see the parameters that the optocoupler output (mosfet side) can handle?

i'm using this arrangement:



Thanks so much!

[PRR]

With a sufficiently "hot" signal, the MOSFET can not suck the signal down to silence, and it could die trying. You would not try to switch wall-power this way!!

With guitar and pedalboard sources, death is unlikely. If leak-through becomes an issue, try 1k in series with the source.