Multiple memory slots for standard contest exchanges, CQ loops, and callsigns.
The input section connects your Morse code paddles (dit and dah) or a straight key to the Arduino.
The schematic includes on CLK and DT lines. Without these, the encoder will jump erratically. k3ng keyer schematic
Connect a normally-open momentary push button between a digital pin (typically D5) and GND. LCD / OLED Displays (Optional)
Ensure the 3.5mm jacks are securely mounted. Multiple memory slots for standard contest exchanges, CQ
For a professional, RF-shielded finish, you can find open-source K3NG PCB designs on repositories like GitHub or OSH Park. A custom PCB minimizes wiring errors and allows you to easily house the project in an aluminum enclosure. 5. RF Immunity: Crucial Design Considerations
The K3NG Keyer is an open‑source Arduino‑based CW keyer originally developed by Anthony Good (K3NG) and hosted on his Radio‑Artisan website. It can be built using a full‑blown Arduino board (Uno, Nano, Mega, Pro Mini, etc.) or an AVR microcontroller chip can be programmed and used directly in a circuit. The keyer is suitable as a stand‑alone unit or can be permanently installed inside a transceiver, especially homebrew QRP rigs. Without these, the encoder will jump erratically
To build a reliable keyer that protects your amateur radio equipment, you must implement proper interfacing circuits. Do not connect Arduino pins directly to your transceiver. A. Paddle Input Circuit
A single momentary switch used to enter command mode, where you can change settings via the paddles. Advanced Modular Features
Before diving into the schematic, it is vital to understand the why . Traditional keyers (like the Bencher BY-1 or commercial Logikey) are locked into firmware. What you buy is what you get. K3NG wanted a keyer that could handle: