K3ng Keyer Schematic Jun 2026

What will you be connecting the keyer to? Share public link

Here is a basic outline of the schematic:

You can find various official and community-designed schematics and PCB files here: k3ng keyer schematic

When Pin 13 goes HIGH , the transistor saturates, pulling the radio's key line to ground and keying the transmitter safely. For absolute electrical isolation, replace the transistor with a . 3. Advanced Schematic Additions

One of the most beloved features is the analog speed control. The schematic shows: What will you be connecting the keyer to

To help you get started on your specific build, let me know: Which (Nano, Uno, Mega) do you plan to use?

Best for "kitchen sink" builds. It provides massive memory and dozens of I/O pins, allowing you to simultaneously run an LCD, a USB keyboard, rotary encoders, multiple keying outputs, and Ethernet. 2. The Minimalist K3NG Keyer Schematic Best for "kitchen sink" builds

Most standard K3NG keyer schematics revolve around a 5V Arduino-compatible microcontroller (typically an , Uno , or Mega 2560 ). However, the K3NG firmware also supports STM32 and Teensy boards. Let’s examine the fundamental blocks.

The schematic must pull up the I2C lines with 4.7kΩ resistors to 5V.