K3ng Keyer Schematic -
Ensure the 3.5mm jacks are securely mounted.
What you want to add (like an LCD screen or WinKey emulation)? Share public link
This is just a sampling; the project also includes practice modes, beacon/Fox modes, Hellschreiber support, QRSS, and even a “dead operator watchdog.” The sheer number of options is a testament to the care that has gone into the software over many years.
If you are following the design, the schematic shows a jumper (JP1) that can be installed to bypass the buck regulator when the input voltage is already a safe 5 V. This modular approach lets you adapt the same PCB to different power environments. k3ng keyer schematic
To adjust your Words Per Minute (WPM) on the fly, connect a 10K ohm linear potentiometer. Connect to Arduino +5V. Pin 2 (Wiper): Connect to Arduino Analog Pin A0 . Pin 3: Connect to Arduino GND. Command Buttons (Memory Triggers)
Connect momentary pushbuttons between a digital pin (e.g., or Digital 6 ) and GND . The internal pull-up resistors handle the rest. LCD Display (I2C Interface)
For an 8-ohm speaker, route the pin through a decoupling capacitor and a resistor to prevent overdriving the Arduino pin. Speed Potentiometer To change your words-per-minute (WPM) speed on the fly: linear potentiometer. Wire side pin 1 to Ensure the 3
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If you need help, the forum is an excellent resource. Many builders post their schematic variations there, and the project maintainer (Anthony Good, K3NG) is often present to answer questions.
House your completed K3NG keyer in a metal enclosure if you plan to use it next to high-power HF amplifiers. If you are following the design, the schematic
The Ultimate Guide to the K3NG Arduino CW Keyer Schematic and Architecture
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:
The core schematic revolves around several key input and output subsystems:
Below is the functional architecture of the standard K3NG keyer circuit.
Required if you want to enable all software features simultaneously (e.g., display, ethernet, extensive command sets) due to its larger flash memory.