K3NG Keyer schematic is the foundational hardware design for an open-source, Arduino-based Morse code keyer developed by Anthony Good (K3NG). Because the project is modular, there is no single "fixed" schematic; instead, it consists of a core circuit for paddles and keying, plus numerous optional modules for features like LCDs, memories, and keyboard interfaces. Core Circuit & Pin Mapping The basic hardware setup typically utilizes an Arduino Uno , though the is often used for feature-heavy builds. Paddle Inputs:
Common circuit (optoisolator or transistor): k3ng keyer schematic
You can find Gerber files for these in the k3ng_keyer/hardware/PCB directory of the official repository. K3NG Keyer schematic is the foundational hardware design
connected to an analog input pin allows for real-time WPM (words per minute) adjustment. 2. Advanced Features & Optional Add-ons The schematic can be expanded to include: LCD Display: Command Mode (enter settings) Message Bank 1-4 (play
Speed Potentiometer: An optional 10k or 100k pot allows for manual CW speed adjustment, typically ranging from 1 to 999 WPM. Advanced Hardware Options
No major changes to the original k3ng hardware required – just 4 extra wires and a small firmware update.
He looked at the Power Section. The schematic showed a simple 7805 voltage regulator. He checked his board. He had 12 volts going in, but the regulator was blistering hot. A quick check with a multimeter confirmed it was outputting nothing. "Overvoltage protection or a dead short," he muttered. He swapped the regulator, and suddenly the LED on the board blinked—the "heartbeat" indicating the code was running.