I currently have a Bel RX65 hidden in the fairing of my motorcycle. The earplug is hooked up to a piezo siren from Radio Shack - this system has worked quite well for me for the past year.
I'm in the process of putting a new MP3 head unit on the bike. It has a cell phone mute capability which - when grounded - mutes the head unit (radio) automatically.
What I was considering is hooking up a reed relay (faster than normal relays and take less power) to ground out the mute lead on the MP3 head unit when the RD goes off. Was thinking it would get my attention even more if the radio mutes when the RD goes off.
My question: Anybody know of a relay that can be triggered by the earphone output of a Bel RX65?