K3ng Keyer Schematic Guide

"The K3NG Keyer," Silas said, setting his coffee down on a stack of QST magazines. "Open-source. The holy grail of the modern shack. It’s not just a schematic, kid; it’s a philosophy."

To help you get started on your specific build, let me know: Which (Nano, Uno, Mega) do you plan to use?

#define FEATURE_COMMAND_BUTTON #define FEATURE_POTENTIOMETER #define FEATURE_SIDETONE #define FEATURE_IKLOG_BUTTONS // if using memory buttons #define FEATURE_DISPLAY_LCD // if using an I2C LCD screen Use code with caution.

Highly recommended because it only requires 4 wires. Connect VCC to 5V , GND to GND , SDA to A4 (on Nano/Uno), and SCL to A5 . k3ng keyer schematic

A common NPN transistor (like a 2N2222 or PN2222) acts as a switch. The Arduino sends a "High" signal to the transistor's base through a 1k–4.7k ohm resistor, which then shorts the transmitter's key line to ground.

The genius of the K3NG keyer lies not just in its software, but in a hardware design that is simultaneously flexible and robust. By studying the , you learn the timeless interface between digital logic and analog radio worlds. Whether you build the $5 minimalist version or a $100 contest command center, the schematic is your map.

Wrap your paddle cable and the cable leading to your transmitter around mix-31 or mix-43 ferrite toroids to block common-mode RF currents. Summary of Default Pin Assignments (Arduino Uno/Nano) Arduino Pin Dit Paddle Closes to GND Dah Paddle Closes to GND Command Button Enters setup menu Transmitter Key Line Drives 2N2222 transistor Sidetone Audio Outputs audio square wave Speed Potentiometer Reads 0V to 5V analog voltage I2C SDA (Display) Data line for LCD I2C SCL (Display) Clock line for LCD "The K3NG Keyer," Silas said, setting his coffee

Configure settings using your paddle and Morse code.

A 3.5mm mono jack connected to the drain (for MOSFET) or collector (for BJT) of the transistor. 4. Optional but Recommended Features

Do not solder components immediately. Use a breadboard to verify that the software and connections work. It’s not just a schematic, kid; it’s a philosophy

The is a highly versatile, open-source Morse code keyer based on the Arduino platform. Its modular code allows it to function as a simple portable keyer or a feature-rich contest station interface. 🛠️ Core Hardware Setup

The keyer can be powered via the (convenient for desk use) or via a 7-12V DC jack connected to the VIN pin. If you are using it in a portable "SOTA" setup, a 9V battery is a common choice. Conclusion