A functional K3NG repack should include these four primary circuits on a single board. A. The Input Stage (Paddles & Buttons)
The Ultimate Guide to the K3NG Keyer Schematic Repack: Building the Ultimate Arduino CW Keyer
+--------------------------------------------+ | 5V/3.3V Regulator | +---------------------+----------------------+ | v +------------------+ +-----+------+ +-------------------+ | Paddle Inputs |-->| |<--| Speed Potentiometer| +------------------+ | | +-------------------+ | ATmega328P | +------------------+ | (Nano) | +-------------------+ | LCD/OLED Display |<--| |-->| Opto-Isolated PTT | +------------------+ +-----+------+ +-------------------+ | v +-----+------+ | Audio Amp |--> Speaker/Sidetone +------------+ Power Supply Section
: Users can configure the keyer via a terminal program like PuTTY or the Arduino Serial monitor . k3ng keyer schematic repack
For those interested in learning more about the K3NG keyer and schematic repack, we recommend the following resources:
ceramic disk capacitor from both the Dot and Dash lines to ground.
Here is a structured post you can use to share your "repack" project with the amateur radio community. 📡 Project Showcase: K3NG CW Keyer Schematic Repack I've been working on a "repacked" version of the legendary K3NG Arduino CW Keyer A functional K3NG repack should include these four
Your preferred (e.g., Nano, ESP32, or raw ATmega328P chip)
For a solid "repacked" build, the hardware setup generally focuses on these core interfaces:
PN2222 or 2N2222 transistors for keying circuit, resistors, and capacitors for debouncing. Building with the Repacked Schematic For those interested in learning more about the
What exactly should you expect from a high-quality repack? Let’s break it down by functional block.
When using a repacked schematic, you must tell the firmware which features to ignore to save memory and pins. In your keyer_features_and_options.h file, ensure only the basics are uncommented: FEATURE_WPM_POT : Enables the speed knob. FEATURE_COMMAND_BUTTON : Required for settings.
: 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.
Connected to specific Pins (e.g., A0/A1) with 10k pull-up resistors.
The genius of the K3NG keyer lies in its feature-rich, open-source code, which is the brain of every version you will encounter. Created by Anthony Good (K3NG), the firmware rivals commercial keyers that cost significantly more. Its long list of features includes: