: Used to enter the "command mode" for configuration via the paddle.
A standard 3.5mm stereo jack is required for your Iambic paddles.
: Connects to the positive (+) line of the transmitter key jack.
Elias had heard of it in passing on the forums—a project by an operator named Anthony, K3NG. He had always assumed it was too complex, requiring a degree in computer science to understand.
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: k3ng keyer schematic
For total electrical isolation between your computer/Arduino and your rig, use a :
Because this device operates in close proximity to High-Frequency (HF) radio transmitters, can cause the Arduino to freeze, crash, or send random strings of dits and dahs. To bulletproof your K3NG schematic against RF:
Typically used for the paddle inputs (Dit and Dah).
A digital output pin (e.g., D13) connects to the base/gate of the transistor through a 1k-ohm to 2.2k-ohm resistor. The collector/drain connects to the positive key line of the rig, and the emitter/source connects to the rig's ground. : Used to enter the "command mode" for
By following these schematic guidelines, you can build a versatile and powerful CW tool customized exactly to your amateur radio station's needs.
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.
The foundation of most K3NG builds includes these primary circuit blocks: HL2 and OpenCWKeyer K3NG Winkeyer - Google Groups
Whether you are printing the k3ng_keyer_schematic.pdf to build a contest-grade station or just to understand how interrupts work, this design represents the pinnacle of DIY radio culture. Elias had heard of it in passing on
Drive the internal LED from an Arduino digital pin (typically D11 or D12) through a current-limiting resistor to GND.
: Connects to the Arduino GND and the negative/shield (-) line of the transmitter key jack. Optocoupler Isolation (Safest)
"Smart. Now, the code."
For a basic, functional keyer, you only need a handful of components. The following is a breakdown of the essential connections: The center of the circuit. Paddle Connector (Stereo 3.5mm Jack): Tip: Paddle Right →right arrow Digital Pin (e.g., D2) Ring: Paddle Left →right arrow Digital Pin (e.g., D5) Sleeve: Ground Keyer Output (Mono 3.5mm Jack):
USB interface for configuration and computer control (WinKeyer emulation) Memory storage for contest exchanges CW Decoder functionality