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DTR Powered Echo Link Interface - "Tiny Echo"

Advanced, PIC 16F84A Echolink Inteface -"Fox Echo"

SC2: New Sound Card Interface with Echolink

SC1: Simple Saound Card Interface for Digital Comm




  Simple Radio to VOIP Interface

End of Project. Kits No longer Available

Please consider FoxEcho-K7 or SC2 KITs


Tiny Echo: Revision 080808


New revised TinyEcho interface:

Click to enlarge


This simple but efficient Echo Link interface measures 9cm x 6cm and is designed on Double Sided PTH Board. 

Provides Full Isolation between Rig & Computer by using two audio transformers & two Opto Couplers. May be powered from DTR Line by running a script on your PC or by supplying external 12V DC.

This interface may be made “Self-Powered” if you run a script called “DTR on/off”. Since DTR is not used, it may power the Opto coupler transistors. However, interface may be powered by external 12V to get the same performance.

Rig ground is 100% isolated from PC ground using high quality Bourns SMT Transformers and 4N33 Opto Isolators.

In fact, this is nothing but a Sound Card Interface with an addition of "COR" isolation circuit. (SC2 includes COR isolation)

With this, I hope to see more amateurs joining this exciting digital mode.


  Tiny Echo Information
Tiny Echo Interface Doc

Schematic & Parts List

Schematic JPG

Tiny Echo: A simple Echolink Interface for your station

DTR On/Off Script Download

DIN5 Version Files

Want to make your own PCBs?




End of project. Kits no longer available.

Please consider FE-K7 or SC2 Kits




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