K3ng Keyer Schematic Jun 2026

Connected to the tip of the output jack to the transceiver. Ground: Output jack sleeve to Ground (GND). 4. Sidetone/Audio Speaker: A small 8-ohm speaker or piezoelectric buzzer.

By carefully following this schematic layout and customizing the accompanying keyer_features_and_options.h firmware file, you will create an incredibly robust, high-performance CW keyer tailored specifically to your ham radio shack.

Compatible with logging software like N1MM.

Connect via the I2C bus (SDA and SCL pins) to display current WPM, operating mode, or decoded text. k3ng keyer schematic

A piezo buzzer or speaker for sidetone, connected via a resistor or capacitor.

The heart of the K3NG keyer is an ATmega micro-controller. While the software can run on various boards, the schematic design changes slightly based on your choice.

Runs on cheap microcontrollers like the Arduino Uno, Nano, Pro Mini, or Mega. Connected to the tip of the output jack to the transceiver

The problem? He had no paddle response. He would squeeze the lever, and the transmitter sat silent. He was ready to scrap the project and buy a commercial unit.

Elias looked at his board. He had wired the paddle directly to the pins. He had forgotten the pull-up resistors. In the world of digital logic, an "open" input floats, randomly reading 1s and 0s like static. The pull-up resistor holds the pin "high" (5V) until the paddle is pressed, dragging it "low" (0V). Without that resistor, the keyer was effectively deaf.

+-------------------+ | ARDUINO UNO | | / NANO | +-------------------+ Paddle Left ---->| D2 | Paddle Right ---->| D5 | | D13|----> Piezo Buzzer (+) | D11|----> Transmitter Keying Circuit +-------------------+ Use code with caution. 1. The Input Section (Paddles) Connect via the I2C bus (SDA and SCL

A 3.5 mm stereo jack is connected as: tip → DIT (e.g., pin D2), ring → DAH (e.g., pin D5), sleeve → GND. The schematic often includes a 10 kΩ resistor from each paddle pin to +5 V and a 10 nF capacitor to ground for debouncing.

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