Meta words: PC, RIG, Audio Interface, CW, Sender, Transceiver, Key, Mike, Decoder, USB, Simulation, Pulsed Tone, Waveform, PCB, Layout, Interface unit, Fabrication, Sun board, housing

Circuit of the interface unit.

TR1 acts as the input amplifier, D1 is used for detection & TR2 for switching. 5V power supply is derived from USB port of the PC.

Simulation results of pulsed tone input and corresponding output waveform for keying.

 Proposed PCB layout for the interface unit

 Completed PC Board.

PCB was hand made by making islands around the pads using a small diamond scribbing bit. 

Fabrication of housing

 (made using Sun Board , 3mm thickness and quick setting glue)

Housing for the PC to RIG Audio Interface unit >

     ( 40X30X13 mm3 )

PC Board inside the housing , ready for final wiring

 Assembly of PC Board inside the housing

Final product !