K3ng Keyer Schematic Repack ❲2025❳

Route the lines from the paddle jack to the Arduino pins as directly as possible to minimize RFI pickup.

To protect your transceiver from the Arduino's voltage, the repack schematic utilizes an optocoupler or a high-voltage transistor circuit. k3ng keyer schematic repack

So go ahead. Roll your own keyer. Just do it with a clean schematic. Route the lines from the paddle jack to

A successful hardware build relies entirely on matching your schematic repack to the firmware variables. Before uploading the code via the Arduino IDE, check these parameters in your keyer_features_and_options.h : Roll your own keyer

SDA to Pin A4 , SCL to Pin A5 , VCC to 5V , GND to GND . Arduino Nano Pin Assignment Reference Table Arduino Nano Pin External Component Speed Pot 10k Potentiometer Wiper Filter with 10nF cap Dit Input Paddle Left / Tip Internal Pull-up used Dah Input Paddle Right / Ring Internal Pull-up used I2C SDA Display SDA Requires display enabled in code I2C SCL Display SCL Requires display enabled in code Sidetone Speaker / Piezo Pass through RC filter Command Push Button to GND For entering configuration menu Key Output Optocoupler Input (PC817) Triggers transmitter keying PTT Output Optocoupler Input (PC817) Triggers amplifier or rig PTT Firmware Configuration Tips

The K3NG keyer relies on an Arduino (typically the Nano or Uno) to process Morse code inputs and trigger transmitter lines. A repack condenses the sprawling original documentation into a standardized, easy-to-read schematic. The system functions through four primary hardware blocks:

: Critical for repacks using the Arduino Mega ; you must redefine pins to match the Mega’s layout instead of the standard Uno/Pro Mini layout.