Amateur Radio Projects


Posted on Feb 4, 2014

It took sometime to develop this interface for Echolink. It uses PIC16F84A and accepts external DTMF from Radio. My Latest Version Foxecho-k7 provides total isolation between Rig And PC and has AGC on received audio. Delay on this project was in part of Wrong DTMF chip that I selected a year back, which did not match the PIC well. Now this interface uses MT8870 and its one of the best sounded


Amateur Radio Projects
Click here to download the full size of the above Circuit.

echolink interface available to amateur radio operators. The best of all is, you do not have to buy this paying high price but you can make it yourself at home. Full documentation & firmware are posted here.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Headphone electrostatic JFET Amplifier
    Composite-amplifier
    Remote control using telephone
    7-MHz Loop Antenna
    60MHz Frequency Meter / Counter 10Hz to 60MHz
    Batteries charger & PSU - ideal for digital camerass
    555 audio oscillator Analog Integrated Circuits
    Loop lighting control circuit
    Traffic intersection light automatic controller circuit
    Treasury temperature measurement alarm circuit diagram F007 5G1555 F033
    Driving circuit schematic



    Top