K3ng Keyer Schematic May 2026

A simple piezo buzzer or a more complex speaker circuit provides audio feedback to the operator.

The brain of the operation is usually an Arduino Uno for basic setups or an Arduino Mega 2560 for builders who want to enable memory-intensive features like LCD displays and full WinKey emulation. k3ng keyer schematic

Two digital pins (typically D2 and D5) are mapped to the left and right paddles to detect "dit" and "dah" inputs. A simple piezo buzzer or a more complex

An optional 10k or 100k pot allows for manual CW speed adjustment, typically ranging from 1 to 999 WPM. Advanced Hardware Options k3ng keyer schematic