Use a die-cast aluminum box (like a Hammond 1590B) to prevent RF interference from tripping the keyer.
Ensure your station ground connects securely to the keyer's enclosure.
For the ultimate standalone experience, adding an LCD or OLED display tracks your WPM, memory slots, and sent text. Highly recommended to save pins. VCC to 5V GND to GND SDA to Arduino A4 (on Nano/Uno) or Pin 20 (on Mega) SCL to Arduino A5 (on Nano/Uno) or Pin 21 (on Mega) 3. Pin Mapping Reference Guide k3ng keyer schematic repack
Once you’ve selected a schematic, the real fun begins: making the keyer truly your own. This open-source project gives you the freedom to decide exactly what goes into your build and how it behaves.
Nano (for compact size) or Mega (for maximum GPIOs). Paddles: Standard Iambic keyer paddles. Transistor (2N2222 or 2N3904): To drive the radio key line. Resistors: 1k Ωcap omega Ωcap omega Potentiometer: 10k Ωcap omega for speed control. Use a die-cast aluminum box (like a Hammond
The K3NG Arduino CW Keyer: Schematic Repack and Builder's Guide
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. Highly recommended to save pins
: Connect the Left (Dit) and Right (Dah) paddles to the Arduino pins defined in keyer_pin_settings.h for Right). Key Output