K3NG keyer complete!

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After some fussing and fiddling, my custom K3NG Morse keyer with a Arduino shield PCB is complete! As input, it can accept a straight key, paddles with a knob for speed control, or the Winkeyer computer interface; for output, it has a sidetone speaker with a headphone bypass and volume knob, and a separate transceiver output port.

It can be used as a code practice oscillator, an automatic keyer, or a Winkeyer interface. It's somewhat redundant as an automatic keyer because most modern radios have that built-in, but it would still help in keeping both a straight key and paddles plugged in simultaneously.

It's not a super complex device, but it was a good opportunity to learn more complex circuits than just "microcontroller pin goes to component," PCB design, and now I have a dedicated practice oscillator and Winkeyer interface. I'm happy!

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