Has anyone interfaced a Dual Tone Modulated Frequency encoder with a handheld walkie talkie before? I was hoping someone could show me a circuit diagram that I could look at. I understand how to interface the encoder with an Arduino, I was just wondering how it could be hooked to the microphone line of the radio. Also, is there a special circuit that must go from speakers to a decoder?
Here is my DTMF encoder module: TP5088N
Here is my DTMF decoder module: CM8870PI CMOS