Echolink Controller with DTMF Decoder
Deutsche Version

Some features:

• Transceiver is complete isolated from the PC

• Real  RS232 signals

• VOX  or COR (positiv or negativ logic selectable)

• Transmitter PTT via optocoupler

• Hardware DTMF decoding

• Muting (automatic) of receiver audio

• Variable audio tone control with an active op-amp circuit

• Adjustable receiver and transmitter audio level

• Power status, DTMF decoding and COR are monitored by LED's

• No relays for switching, all switching is done by optocouplers

• Usable for other digital modes like PSK31

• With extra circuit board: AGC amplifier for the receiver audio

• Free Sourcecode (assembler and hex code) for PIC16F84 or PIC16F627 (built with MPLAB 6.41 from Microchip)

• Layouts and circuits are made with the pcb and layout CAD software Target 3001 (you can get a free demo version from Target here)