Day: March 8, 2014

A keying output buffer (2SC1815) is used to connect the Aruduino CW keyer to my rig. The two lines (red) go to the rig, and the three lines (green) go to the paddle.

The red trace is the keying output before inverted by the output buffer, and the yellow trace is the side-tone from the rig.

I tried the CW keyer program by K3NG. The two blue lines connected to the probes are for Keying Output and Side-tone, respectively. The green line goes to the GND, and two blue lines go to my paddle.

These are the waveforms when the paddle is squeezed. The red trace shows the Keying Output, and the yellow one is the Side-tone around 600Hz.