K3ng Keyer Schematic Link

For the amateur radio operator who enjoys rolling their own gear, the name "K3NG Keyer" needs no introduction. Developed by Anthony Good (K3NG), this Arduino-based keyer is the gold standard for open-source Morse code sending. It rivals (and often surpasses) commercial keyers that cost hundreds of dollars.

Two common variations appear in K3NG schematics: k3ng keyer schematic

Absolutely. While newer microcontrollers (ESP32, RP2040) have more power, the K3NG schematic remains the standard because: For the amateur radio operator who enjoys rolling

This tells you: When D10 goes HIGH, Q1 turns ON, collector pulls to GND, output keys the transmitter. RP2040) have more power