http://www.foxdelta.com/products/foxecho.htm#fepic16f84a micro controller echolink* interface is designed to achieve some of the following points of interest to radio amateurs:
real rs232 signals
100% galvanic separation
plug-in tone & agc module (option)
cor (positive or negative logic selectable)
hardware dtmf decoding
muting (automatic) of receiver audio
adjustable receiver and transmitter audio levels
power status, dtmf, ptt and cor led's
uses a pic16f84a
din 5 front panel connector for easy interface to rig
transceiver connection has “ht” header for portables
no relays. uses hfe4053 analog switches.
12cm x 7cm, double sided pth board.
usable for other digital modes like psk31
a true homebrew project, you can build.
