Hi!
My receiver has a speaker select (zones) toggle on the front of the chassis, with a simple push button behind it. As far as I can tell from the service manual, the button is switched to chassis ground and connected to a input on a microcontroller. I am planning on switching it with a Raspberry Pi or an Arduino.
Would it be safe to use a optoisolator for this, or do I need a relay? I have soldered two wires to the push button, shorting them seems to work fine, and was hoping I could use a "4N35 FSC Optocouplers Phototransistor 30V DIP6" I have available...
Snippets from service manual:
I hope someone is able to give me some advice (and/or comfort)