Dual paddles, speed pot, basic command buttons, simple piezo sidetone, basic WinKey emulation. Full-featured desktop stations, contest logging
Powered via the USB port or an external 7V to 12V DC supply connected to the VIN pin.
A schematic repack is only as good as its matching keyer_settings.h and keyer_features.h files. When flashing your Arduino with the K3NG source code, ensure the following definitions match your repacked hardware:
Minimal components (Arduino Pro Mini, small battery, piezo sidetone) mounted in a small junction box. k3ng keyer schematic repack
Momentary switches used to enter command mode or trigger stored macros. 3. Popular "Repack" Variations
In the world of amateur radio (ham radio), CW (Morse Code) remains a beloved and highly efficient mode. While many commercial keyers exist, the open-source K3NG Arduino CW Keyer project stands out as the ultimate, flexible, and powerful solution.
For most users, the "basic" schematic is the best starting point. Arduino Nano/Pro Mini (ATmega328P). Input: CW Paddle (Left/Right/Common). Dual paddles, speed pot, basic command buttons, simple
Connect a 0.01µF capacitor from the wiper (Pin 2) to GND to eliminate analog jitter. 4. Transmitter Keying and PTT Outputs (Optoisolated)
Pushbuttons connected to ground, mapped to input pins. Conclusion
Ensure the pin numbers listed in your keyer_pin_settings.h match the Arduino Nano pin numbers detailed in the table above. PCB Layout and Construction Considerations When flashing your Arduino with the K3NG source
Before warming up your soldering iron, you must pick your silicon. Because the code is highly modular, you can comment out unused features to fit small chips, or unleash the full software suite on larger microcontrollers. Microcontroller Flash Memory Supported Features Compact portable builds, basic QRP rigs
The term "repack" in the context of the K3NG keyer refers to the community's re-implementation of the original schematic concept into new, specialized PCB designs and build guides. The core software remains the same, but the hardware has been repackaged countless times to cater to different needs.
Arduino pin D11 generates the pulse-width modulation (PWM) audio signal.
+---------------------------------------------+ | Power Supply (USB / 5V) | +----------------------+----------------------+ | v +----------------------+----------------------+ | Microcontroller Core | <--- Speed Pot / Buttons | (Arduino Nano or Mega 2560) | <--- CW Iambic Paddles +-------+-----------------------------+-------+ | | v v +--------------+--------------+ +------+----------------------+ | Rig Isolation & Output | | Display & Peripherals | | (Optocouplers / PTT Line) | | (I2C LCD / PS2 / Sidetone) | +-----------------------------+ +-----------------------------+ 1. The Inputs (Paddles, Buttons, and Pots)
: A modern 2023 repack that uses SMD components, galvanic isolation (optocouplers), and a 3D-printed enclosure. SimpleCWKeyer (VE3WMB)