K3ng Keyer Schematic _verified_ Jun 2026

Let’s explore each section as it appears in the standard schematic.

Many builders prefer using pre-designed PCBs that consolidate these features: K3NG - kk9jef

For a functional, basic K3NG keyer, you do not need to connect all the options. A minimum viable product (MVP) can be built on a breadboard. 1. The Brain: Arduino Board Most builders use an , Go to product viewer dialog for this item. , or Go to product viewer dialog for this item. k3ng keyer schematic

Connect the of the transistor to Arduino GND and the outer shield (ground) of your rig's key jack.

the features you built into your schematic (e.g., #define FEATURE_POTENTIOMETER , #define FEATURE_LCD_I2C ). Let’s explore each section as it appears in

You can find various official and community-designed schematics and PCB files here:

To leverage the full power of the K3NG firmware, you can expand your schematic by wiring additional peripherals to the unused pins of your Arduino. Speed Control (Potentiometer) Connect the of the transistor to Arduino GND

For the full schematics, wiring diagrams, and the latest software code, visit the official K3NG GitHub Wiki . The Radio Artisan Blog is also a key resource for troubleshooting and design ideas.

The common ground of the paddle connects to the Arduino GND pin. 2. The Audio Sidetone Section

If you want, I can for a specific configuration (e.g., Nano + optoisolator keying + I2C LCD + speed pot). Just tell me which features you need.