K3ng Keyer Schematic May 2026

A "bare bones" schematic uses just two paddles. A "full" K3NG schematic looks like a cockpit.

Modern K3NG schematics use I2C LCDs. This requires only 4 wires:

Older schematics (pre-2015) use parallel 4-bit mode, which eats up 6 pins (RS, E, D4, D5, D6, D7). If you see a schematic with a 16-pin LCD connector and a potentiometer (10kΩ for contrast), that is a legacy parallel design. Avoid it unless you have the pins to spare.

One of the most beloved features is the analog speed control. The schematic shows:

The firmware reads this voltage to set words-per-minute (WPM) from about 5 to 50+.

If you want, I can:

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K3NG Keyer is a highly versatile, open-source CW (Morse code) keyer based on the Arduino platform, developed by Anthony Good (K3NG). Because of its modular nature, there isn't just one single "master" schematic; instead, the design scales from a simple two-paddle interface to a complex station controller with LCDs, keyboards, and multiple radio outputs. 1. Core Circuit Components

At its most basic, the K3NG keyer requires an Arduino (Uno, Nano, or Mega) and a few interface components: Processor: Typically an Arduino Nano for basic builds, or an Arduino Mega for feature-heavy versions requiring more pins and memory. Paddle Input:

Two pins on the Arduino are connected to the "Dit" and "Dah" lines of a paddle. These are usually pulled high by internal resistors and grounded when the paddle is pressed. Transmitter Keying Line: A buffer transistor (like a

) is used to key the radio. The Arduino sends a "high" signal to the transistor base, which then pulls the radio's key line to ground.

An optional small speaker or piezo buzzer connected to a digital pin (often with a current-limiting resistor) to provide audio feedback of the Morse code being sent. Speed Control: 10k ohm potentiometer k3ng keyer schematic

connected to an analog input pin allows for real-time WPM (words per minute) adjustment. 2. Advanced Features & Optional Add-ons The schematic can be expanded to include: LCD Display:

Supports classic 4-bit, I2C, or RGB displays to show speed, settings, and decoded CW. Command/Memory Buttons:

A series of buttons (often connected via a resistor ladder to a single analog pin) used to trigger recorded messages or enter command mode. USB/PS2 Keyboard:

Interface circuitry to allow typing Morse code directly from a keyboard. PTT (Push-to-Talk):

Additional keying lines for controlling external amplifiers or switching sequences. 3. Implementation Tips Pin Configuration:

Because users often use different Arduino models, the specific pin assignments are defined in the keyer_pin_settings.h file within the K3NG Keyer Code Feature Selection: You must enable or disable specific features (like FEATURE_LCD FEATURE_WPM_POT keyer_features_and_options.h file before uploading the code to your hardware. Isolation:

For high-voltage or vintage tube rigs, it is highly recommended to use an optically isolated

keying circuit (optocoupler) instead of a simple transistor to protect the Arduino. 4. Summary Technical Specifications Implementation Speed Range 1 to 999 WPM Iambic A/B, Ultimatic, Bug, Straight Key Winkey 1.0/2.0 emulation for contest logging USB (5V) or 7-12V via Arduino Vin pin wiring diagram for a particular Arduino model, like the Further Exploration K3NG keyer on ESP8266 - Radioartisan - Groups.io

Keyboard Shortcuts * ctrl + shift + ? : * ctrl + g : * ctrl + shift + f : * ctrl + / : Arduino keyer TX line issue - Radioartisan - Groups.io

The K3NG Keyer is a versatile, open-source Morse code keyer based on the Arduino platform, developed by Anthony Good (K3NG). It is highly modular, allowing builders to choose specific features by enabling or disabling them in the code. Core Schematic Components

A basic K3NG keyer schematic typically centers around an Arduino Uno or Mega and includes several fundamental circuits: A "bare bones" schematic uses just two paddles

Processor Core: Most builds use an Arduino Uno for basic needs or an Arduino Mega 2560 for memory-intensive features like LCDs and full macro support.

Paddle Interface: Connects to the Arduino's digital pins (often D2 and D5) to sense "Dit" and "Dah" inputs.

Transmitter Keying: A simple NPN transistor (like a 2N2222) or a reed relay is used to isolate the Arduino from the radio's keying line.

Sidetone Audio: A small piezo buzzer or speaker driven by a PWM pin for audio feedback.

Speed Control: A 10k potentiometer connected to an analog input (usually A0) for real-time WPM adjustment.

Command Buttons: Often includes a "Command" button to enter programming mode via the paddles. Advanced Hardware Options

The schematic can be expanded with various modules depending on the builder's requirements:

The K3NG Keyer is a highly versatile, open-source Morse code keyer based on the Arduino platform. Its modular code allows it to function as a simple portable keyer or a feature-rich contest station interface. 🛠️ Core Hardware Setup

A basic build requires minimal components, while advanced versions can include LCDs and specialized interfaces. Essential Components A tiny and open source CW keyer - Dhakajack - Templaro

K3NG has written a top-notch keyer based on the arduino platform. Its strengths are its modular design and extensive feature list; blog.templaro.com Getting Started with the K3NG Arduino CW Keyer 2

The K3NG firmware generates a sidetone square wave on a digital pin (usually D6 or D9 via PWM). However, a raw square wave is harsh and weak. The schematic typically includes: Older schematics (pre-2015) use parallel 4-bit mode, which

Pro Tip: Look for a zener diode (5.1V) clamping the audio line to protect the amplifier from voltage spikes.

If you look at any K3NG schematic (v1.0, v2.0, or the latest "Next Generation" variants), you will see five distinct sections:

Let’s explore each section as it appears in the standard schematic.

A KY-040 or generic encoder is a huge upgrade. Looking at the schematic:

The schematic includes 10kΩ pull-up resistors on CLK and DT lines. Without these, the encoder will jump erratically.