A functional K3NG repack should include these four primary circuits on a single board. A. The Input Stage (Paddles & Buttons)
This post is about the K3NG schematic—distilling it down to a clean, modular, buildable set of diagrams.
Pin 1 to GND , Pin 2 (wiper) to Analog Pin A0 , Pin 3 to 5V .
Repacking a schematic requires upgrading from a prototyping mindset to a permanent hardware mindset. Microcontroller Selection Move away from the bulky Arduino Uno board. k3ng keyer schematic repack
Here is a general workflow for building any K3NG-based keyer:
The entire circuit needs a clean 5V power source. If you're using a standard Arduino board, it has an on-board voltage regulator that allows you to power it from a 7-12V DC source via its Vin pin or the barrel jack. For a minimalist "chip-only" build (using just the AVR microcontroller), you would need to design an external 5V regulator circuit.
In keyer_features_and_options.h , uncomment ( // ) the features you want to use (e.g., #define FEATURE_LCD_I2C ). A functional K3NG repack should include these four
This guide breaks down how to repack the K3NG keyer schematic for modern, efficient circuit board production. 1. Core Architecture Changes
Start by picking a board. You can build a basic K3NG unit on a standard Arduino (like an Uno, Mega, or Nano) connected to a breadboard. Or, for a cleaner and more professional result, you can use a purpose-built PCB like the (from DJ0MY/N7XG) or the K5BCQ board, which take all the guesswork out of wiring. The choice of board will dictate which components you need.
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. Pin 1 to GND , Pin 2 (wiper) to Analog Pin A0 , Pin 3 to 5V
For the most current "repacked" versions, enthusiasts often look at:
While there is no single document widely titled "repack — solid paper" for the K3NG keyer, the "solid" or highly recommended way to obtain and build the is through its official GitHub Repository and the Radio Artisan project page . Core Schematic & Wiring
Instead of one messy diagram, two sub-blocks: