Open keyer_pin_settings.h and explicitly verify that the physical pins you soldered match the code definitions.
: This is the starting point, often a simple schematic showing an Arduino (like a Pro Mini or Nano) connected to a few key components like a piezo buzzer for sidetone, a speed potentiometer, and a connection for a straight key or iambic paddle. It’s an excellent blueprint for understanding the fundamental electronics at play.
A successful repack of the K3NG keyer schematic typically revolves around three primary subsystems: the control logic, the human interface, and the output stage. k3ng keyer schematic repack
: A popular PCB kit that fits the Arduino Nano, designed to be compact and efficient. K5BCQ Version : A comprehensive shield board designed for the Arduino Mega that supports almost every feature in the K3NG code. SMD Repack (Joan Perelopez)
This version is typically built on an Arduino Nano and is perfect for a first-time builder. It forms the foundation for many of the more complex PCBs. Open keyer_pin_settings
: Use an 4N25 or ILQ621 optocoupler to create true galvanic isolation between your keyer and your rig.
| 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 | A successful repack of the K3NG keyer schematic
Pin 1 to GND , Pin 2 (wiper) to Analog Pin A0 , Pin 3 to 5V .
16x2 LCD or 0.96" OLED with an I2C backpack interface.
A functional K3NG repack should include these four primary circuits on a single board. A. The Input Stage (Paddles & Buttons)
+---------------------------------------------+ | 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)