K3ng Keyer - Schematic

In the world of amateur radio, few open-source projects have achieved the cult status of the K3NG Arduino Keyer . Developed by Anthony Good (K3NG), this feature-rich CW (Continuous Wave) keyer has become the gold standard for homebrew station accessories. Whether you are building a simple portable paddle keyer or a fully automated contest station controller, understanding the K3NG keyer schematic is your first step toward mastering this versatile device.

For high-voltage tube rigs, the schematic may include an optocoupler (e.g., 4N35) or a relay to provide absolute galvanic isolation. 3. PTT (Push-to-Talk) Output Similar to keying, PTT requires a transistor switch. Many K3NG schematics dedicate a separate pin (e.g., D13) for PTT. This allows the keyer to put the radio into transmit mode before the first dit—essential for QSK (full break-in) or semi-break-in operation. k3ng keyer schematic

Grab an Arduino, some transistors, a few resistors, and a soldering iron. Download the schematic. Start prototyping. Within an afternoon, you’ll be sending perfect CW—knowing exactly how every dit and dah flows from paddle to radio. In the world of amateur radio, few open-source