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Get off you duff and build something!
Training the hand and mind since 1982.

Thursday, July 6, 2017

Echo-link Interface Box

Hi All,

Decided to finally get out of the prototype phase of my echolink interface. Here are some pics below of the project, it's been in use on the Plymouth repeater (146.685) for about 6 months with no issues. It took a little figuring out the RTS line on the FTDI cable was active low in stead of active high, but fixed it with a simple 2N7000 MOSFET inverter. The transformers are TY-145P and I used the ear bud/mic connector that came with the Beofeng UV-5R, I do believe that mouser now carries the spk/mic connectors for the kenwood, Beofeng, etc, etc.


Prototype Version 1


Here is the schematic


And finally the board design


Yes those are TO-39 Packages, hey they work good and come out great with the PCB mill machine, the flats side of the 2N7000 goes left toward the transformers. I have a better parts library but it's on my PC at work, go figure. I have the PCB file and Gerber's, email if needed.