Anthony Good designed the K3NG keyer as a software-first project. The code supports dozens of pin configurations for various microcontrollers: Arduino Uno, Nano, Mega 2560, Teensy, STM32, and even ESP8266. Each microcontroller has a different pinout. Additionally, the keyer can be built with optional features like:
Uses an optoisolator (like a 4N25) or a transistor (2N2222) to switch the transceiver.
A standard repack schematic usually includes these key "pieces":
/Uno): Best for a standalone keyer with basic paddle input and a few memories. Keep in mind that memory is limited (32K), so you’ll need to disable heavy features like the full CW decoder to make it fit. The Powerhouse Arduino Mega 2560 Go to product viewer dialog for this item. k3ng keyer schematic repack
Once the basic keyer is working, you can expand its capabilities using additional parts of the original schematic:
: A small speaker or piezo buzzer connected to a dedicated PWM pin for audio feedback. Core Software Repacking
Thus, the holy grail of the K3NG repack isn't a static image. It is the —a Fritzing, KiCad, or even a DIYLC (DIY Layout Creator) project where you check boxes: Anthony Good designed the K3NG keyer as a
An updated or "repacked" schematic for the K3NG Arduino CW Keyer
The Ultimate Guide to the K3NG Keyer Schematic Repack: Building the Ultimate Arduino CW Keyer
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. Additionally, the keyer can be built with optional
FEATURE_MEMORIES : If you want to store CQs or your callsign.
Use a reputable Arduino Nano v3. Some older or cloned Arduino Nano v2.x models do not have sufficient memory PDF 1.2.5.
The K3NG Arduino CW Keyer project is a cornerstone of modern amateur radio homebrewing, offering a feature-rich, open-source Morse code keyer that rivals, and often surpasses, expensive commercial alternatives. Based on the flexible Arduino platform, it allows for incredible customization, including memories, display support, speed controls, and USB/network integration.
So, gather your components, open your schematic, and join a community of hams who have embraced the power of open-source to build the best CW keyers in the world.