For amateur radio operators, the K3NG Arduino-based Morse code keyer is nothing short of legendary. Developed by Anthony Good (K3NG), this open-source project has become the gold standard for modern keyers, offering features that rival—and often surpass—commercial units costing hundreds of dollars. From contest-grade memory functions, PS2 keyboard support, and Winkeyer emulation to touch interfaces and Bluetooth control, the K3NG keyer can do it all.
This is the most critical part of the schematic. You must interface the 5V Arduino logic with the (often higher voltage) keying line of your rig.
Testing and Validation
: An 8-ohm mini speaker or piezo buzzer is connected to pin D4 through a current-limiting resistor. PCB Layout Considerations for the Repack k3ng keyer schematic repack
A small piezo speaker or speaker driven by a transistor from an Arduino digital pin (often D11). Key Build Options
For amateur radio operators who enjoy Morse code (CW), the is nothing short of a legend. Developed by Anthony Good (K3NG), this open-source project transforms a simple Arduino (like the Uno, Nano, or Mega) into a feature-packed CW keyer that rivals commercial units costing hundreds of dollars. We’re talking about:
The K3NG Arduino CW Keyer is the gold standard for amateur radio Morse code enthusiasts. While the original project by Anthony Good (K3NG) is incredibly feature-rich, the sheer volume of options can make the schematic feel overwhelming. A "repack" simplifies the design into a practical, buildable project for the modern ham. The Core Components For amateur radio operators, the K3NG Arduino-based Morse
A 10k ohm linear potentiometer used to adjust words-per-minute (WPM) on the fly.
The author and publisher disclaim any liability for damages or injuries resulting from the use of this guide. The reader assumes all risks and responsibilities for the design, manufacture, and use of the K3NG keyer.
Uncomment #define FEATURE_WINKEYER to allow software like N1MM or HRD to control your keyer over USB. This is the most critical part of the schematic
The most common choice for "repacks" due to its small size. Note that it has memory limits, so you may need to disable some advanced features in the code.
A of the K3NG schematic is all about condensing that modular complexity into a single, reliable blueprint. Whether you are building on a breadboard or designing a custom PCB, here is the definitive guide to the K3NG keyer hardware architecture. 1. The Core Processor: Arduino Nano vs. Uno
A 10k linear pot connected to Analog Pin A0 for real-time WPM adjustments. Simplified Schematic Connections Arduino Pin Paddle DIT Connect to Ground when pressed Paddle DAH Connect to Ground when pressed Command Button For menu navigation Keying Output Drives the transistor/optoisolator Sidetone/Buzzer Piezo buzzer for practice Speed Pot Center pin of 10k Pot Essential Code Configuration (k3ng_keyer.h)
In late 2024, Anthony Good (K3NG) expressed interest in merging community repack contributions into the main repository. If successful, future keyer builders will no longer need to hunt for scattered diagrams.