K3ng Keyer Schematic Jun 2026

A standard 3.5mm or 1/4" stereo jack is needed for the paddles. Wiring: Tip: Paddle Right →right arrow Connected to Arduino Pin (typically D2). Ring: Paddle Left →right arrow Connected to Arduino Pin (typically D5). Sleeve: Ground →right arrow Connected to Arduino Ground (GND).

To prevent stray Radio Frequency Interference (RFI) from causing false triggers during transmission, place a

While the design is highly modular, a basic K3NG keyer schematic typically includes the following foundational elements: k3ng keyer schematic

Configure settings using your paddle and Morse code.

Enabling the hardware to talk to logging software like N1MM or Ham Radio Deluxe. Impact on Amateur Radio A standard 3

The code was running, but the paddle still didn't work. He turned to the Input Section of the schematic.

The K3NG CW Keyer, designed by Anthony Good (K3NG), is the most versatile, feature-rich, and customizable open-source Morse code keyer available to amateur radio operators. Built on the accessible Arduino platform, this keyer can be scaled from a simple, budget-friendly practice device to a high-end, studio-grade station controller. Sleeve: Ground →right arrow Connected to Arduino Ground

Unlike rigid, commercial integrated circuits (ICs), the K3NG keyer is software-defined. By modifying a single configuration file ( keyer_features_and_options.h ), you can enable or disable hundreds of features.

Using a 4N35 or PC817 optocoupler completely isolates your computer/Arduino ground from your radio ground.

The K3NG ecosystem has spawned dozens of specialized schematics. Here are the most common: