K3ng Keyer Schematic Repack Jun 2026

The necessity for a schematic repack stems from the evolution of the hobbyist workspace. The original project documentation provided a "menu" of hardware options: one diagram for the display, another for the paddle input, and disparate notes for PS2 keyboards or speed potentiometers. While comprehensive, this approach forced the builder to mentally splice circuits together before even heating a soldering iron.

Connect the display VCC to Arduino 5V and GND to Arduino GND . 💻 Firmware Configuration Highlights

Regulatory and Practical Notes

Are you keying an (high voltage) or a modern solid-state radio? k3ng keyer schematic repack

In keyer_features_and_options.h , uncomment ( // ) the features you want to use (e.g., #define FEATURE_LCD_I2C ).

The is the absolute gold standard for open-source Morse code keying in amateur radio. Created by Anthony Good (K3NG), this software-driven masterpiece packs features that rival or exceed expensive commercial hardware. However, because the code supports everything from basic paddles to full LCD displays, PS/2 keyboards, and WinKey emulation, its hardware design can quickly become a tangled web.

A standard repack focuses on the essential "Code B" features. You don't need every pin connected to build a high-performance keyer. Arduino Nano or Pro Mini (ATmega328P). Input: Two 3.5mm jacks (Paddle and Straight Key). Output: 2N2222 or 2N7000 switching transistor. The necessity for a schematic repack stems from

Allows the keyer to work with modern logging software (N1MM). 6. Resources for the K3NG Keyer Documentation: K3NG CW Keyer Wiki Support Forum: Radio Artisan Group on groups.io

: If implementing a Push-To-Talk (PTT) delay line, duplicate this identical optocoupler sub-circuit on a secondary digital pin to handle manual amplifier switching. A CW keyer based on the K3NG and K5BCQ work - GitHub

To ensure a successful schematic repack, keep the following tips in mind: Connect the display VCC to Arduino 5V and GND to Arduino GND

: Connect the Left (Dit) and Right (Dah) paddles to the Arduino pins defined in keyer_pin_settings.h for Right). Key Output

: Demonstrating how versatile the code is, builder KK9JEF dramatically simplified the circuit to its absolute essentials, fitting everything into a 1-gang plastic junction box. He omitted the LCD, keyboard support, and practice modes, using the keyer as a generic ultimatic-style keyer with sidetone and a speed pot, all powered by 4 AA batteries. This version is a perfect example of how you can "repack" the software to work with the simplest possible hardware.

The K3NG keyer is a remarkable piece of open-source engineering that puts a world-class CW keyer within reach of any amateur radio operator with basic soldering skills and a willingness to learn. Its schematics, though initially daunting, are a map to understanding a sophisticated digital device. By treating the build as a learning experience and starting with a simple core configuration, you can gradually add features and gain confidence.

The project’s open-source nature is its greatest strength. You can fully customize it, learn from the code, and adapt it to your specific needs, making it a valuable educational tool as well as a functional piece of amateur radio gear.