[Elecraft] K2 OptoCAT and PA buffer

[ik2bcp - Guido Tedeschi]

I published the project of an optocoupled RS232 interface for K2 and KIO2
with a simple PA buffer (to switch an external PA or any other device on
TX).
You can see it at: http://www.hamlan.org/tech/k2optocat/k2optocat.htm
Ciao and 73
Guido, ik2bcp