The schematic begins with the paddle inputs (Dit and Dah). These are connected to digital pins on the Arduino, pulled high using internal or external resistors. When the operator presses a paddle, the pin is grounded, triggering the code to generate the appropriate Morse element. Keying Circuit:
The K3NG Keyer is not a single fixed schematic but a around an Arduino (Uno, Nano, Mega, Teensy, etc.). It supports: k3ng keyer schematic
The simplest schematic uses a USB cable (5V). For portable operation, you need an . The schematic begins with the paddle inputs (Dit and Dah)