K3ng Keyer Schematic 〈SAFE »〉

A common point of confusion is the analog button matrix. In the generic K3NG schematic, a 10kΩ resistor is connected from +5V to the analog_buttons_pin . The "Command" button is then the first button connected to this pin. Following that, each memory button is separated by a 1kΩ resistor before connecting to the same analog line. When you press a button, it creates a specific voltage divider, creating a unique voltage that the Arduino's ADC can read. This design allows the keyer to distinguish between up to 12 different buttons using just one pin.

+-------------------+ | ARDUINO UNO | | / NANO | +-------------------+ Paddle Left ---->| D2 | Paddle Right ---->| D5 | | D13|----> Piezo Buzzer (+) | D11|----> Transmitter Keying Circuit +-------------------+ Use code with caution. 1. The Input Section (Paddles)

Ensure your chosen hardware constraints match the code memory limits. If using an Arduino Nano or Uno, be selective with features, as memory (flash storage) can fill up quickly. For a "kitchen sink" build with every option turned on, upgrade your schematic to use an . k3ng keyer schematic

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

For those seeking a more defined path, the project by N7XG offers a fantastic, ready-to-use schematic and PCB. This popular variant is built around an Arduino Nano 3.0 and includes a 5V Mini-360 buck regulator for power input, LEDs, headers, and built-in transistor drivers for keying. The full schematic is available in its manual. The parts list from the nKeyer gives specific values that are a great starting point for understanding the component requirements of a K3NG keyer. A common point of confusion is the analog button matrix

A very common and satisfying first build is a compact, USB-powered keyer using an Arduino Nano. This project leverages the schematic and parts list from the nKeyer.

Supports iambic modes (A, B, Ultimatic), memory macros, serial terminal control, and QRSS. Following that, each memory button is separated by

The problem? He had no paddle response. He would squeeze the lever, and the transmitter sat silent. He was ready to scrap the project and buy a commercial unit.

"I'm trying to get this paddle to interface with my linear amp without turning the rig into a doorstop," Elias sighed. "The timing circuits are a nightmare. I’ve burned through three 555 timers tonight."