K3ng Keyer Schematic

The heart of the schematic is the ATMega328P (on Nano/Uno) or ATMega2560 (on Mega). The key pins to identify are:

Status LED

At its heart, the K3NG keyer uses an ATmega328P microcontroller (typically via an Arduino Uno, Nano, or Pro Mini) to look for grounding signals on input pins. When it detects a press, it executes precise timing loops to switch output transistors, generating perfect Morse code. k3ng keyer schematic

Connect the common (ground) line of your paddle to the Arduino GND. Connect the Dit and Dah lines to two separate digital pins (typically D2 and D3). The heart of the schematic is the ATMega328P