K3ng Keyer Schematic Repack -

Nano (for compact size) or Mega (for maximum GPIOs). Paddles: Standard Iambic keyer paddles. Transistor (2N2222 or 2N3904): To drive the radio key line. Resistors: 1k Ωcap omega Ωcap omega Potentiometer: 10k Ωcap omega for speed control.

Component choices & layout

| Issue with Original | Advantage of Repack | |---------------------|----------------------| | Wires crossing over unrelated blocks | Modular layout | | Repeated net labels scattered | One clear power bus and ground | | Hard to find input pull-ups | Dedicated “Input Section” | | Unclear component values | Consolidated BOM (Bill of Materials) near each block | k3ng keyer schematic repack

Pin 13 (Connect via 1k resistor to base of 2N2222 transistor)

A "repack" is an effort to compile these schematic resources into a more digestible and user-friendly format. It takes the disparate, often bare-bones schematics from the official wiki, GitHub repository, and community forums, and repackages them into an organized guide that connects the circuit diagrams to the physical components and their functions. Nano (for compact size) or Mega (for maximum GPIOs)

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

To make this specific repack schematic work seamlessly, you must alter the keyer_pin_settings.h and keyer_features_and_options.h files in the K3NG source code before uploading: Resistors: 1k Ωcap omega Ωcap omega Potentiometer: 10k

Use a 4N25 or PS2501 Optoisolator . This provides electrical isolation between your Arduino and your expensive transceiver, preventing ground loops and voltage spikes.

The keyer circuit uses a simple interrupt-based approach to generate the Morse code dots and dashes. The microcontroller reads the key closure and generates the corresponding Morse code sequence.

In the world of amateur radio, the (created by Anthony Good, K3NG) is a legend. It started as a simple Arduino-based electronic keyer for Morse code (CW) and evolved into a Swiss Army chainsaw: a fully-featured contest keyer, a rotator controller, a satellite tracker, and an antenna switch manager.

The PCB is designed as a single-sided controller board.