eQSO PC to Radio Interface

With Thanks to G4KQU

This simple Sound Card Interface will also work with SSTV - PSK 31 Ect...

R1-R2-R3 = 1K
Rv1 = 22K Log Pot (TX Audio Level)
C1 = 2.2uF 50V
D1 = LED (TX Led)
D2 = 1N4148
T1-T2 = Type 9000 600 Ohm Isolation Transformer R.S. Number =  208-822
IC1 =  Optocoupler 4N25 R.S. Number = 597-289