K3ng Keyer Schematic [upd] ❲TRENDING | Pack❳

Elias looked at the small, unassuming device. It wasn't a mess of wires anymore; it was a tool. "I think I’m going to add the LCD screen next," he said, reaching for the schematic printout again. "I want to see the words as they're being sent."

Similar to keying, PTT requires a transistor switch. Many K3NG schematics dedicate a separate pin (e.g., D13) for PTT. This allows the keyer to put the radio into transmit mode before the first dit—essential for QSK (full break-in) or semi-break-in operation.

What you want to add (like an LCD screen or WinKey emulation)? Share public link

Connects to Arduino Digital Pin D2 and GND . k3ng keyer schematic

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

If you want an audible sidetone, install the sidetone transistor stage. The nKeyer schematic uses Q2 (2N2222) with a 1 kΩ series resistor from an Arduino pin (e.g., D12) to the base, and a speaker connected from collector to GND. An optional 100 µF capacitor (C5) in series with the speaker blocks DC.

The schematic includes on CLK and DT lines. Without these, the encoder will jump erratically. Elias looked at the small, unassuming device

Silas plugged the drive into Elias’s dusty laptop. A file folder opened, revealing a massive collection of files.

The solves this with a 2N2222A transistor (or BS170 MOSFET) and a 1kΩ base resistor .

Place 0.01µF or 0.1µF ceramic disc capacitors across the paddle input lines to ground, and across the transistor collector-to-emitter line. This shunts stray RF safely to ground before it reaches the microcontroller. "I want to see the words as they're being sent

Visit the official GitHub repository and download the latest code. The main sketch is k3ng_keyer.ino . The key configuration files are:

This is just a sampling; the project also includes practice modes, beacon/Fox modes, Hellschreiber support, QRSS, and even a “dead operator watchdog.” The sheer number of options is a testament to the care that has gone into the software over many years.