i am working on a little side project where i need til to transmit recorded audio out on a radio.
it needs to be small since i am going to connect it to a handheld radio. and therefore it needs to have its own powersuply.
the plan is that i am going to connect a mp3 player to the radio. i just need the interface to between the radio and the mp3 player, my plan is to overlay a tone on the audio to tell the interface when to punch the radio.
the problem is that i am out of ideas of how to do this
it needs to be small since i am going to connect it to a handheld radio. and therefore it needs to have its own powersuply.
the plan is that i am going to connect a mp3 player to the radio. i just need the interface to between the radio and the mp3 player, my plan is to overlay a tone on the audio to tell the interface when to punch the radio.
the problem is that i am out of ideas of how to do this