with DTMF Decoder
Circuit page 1 (png)
Circuit page 2 (png)
Sourcecode for PIC16F84 (zip)
Sourcecode for PIC16F627 (zip)
Option: AGC amplifer (Target)
Option: AGC amplifier circuit (png)
Option: AGC amplifier layout (png)
Option for the receiver:
Squelch circuit (COR) (Target)
|The radio ground is complete isolated from the computer ground.
The DTMF signals are decoded from the hardware.