K3ng Keyer Schematic ⟶ ❲TRUSTED❳

A common NPN transistor (like a 2N2222 or PN2222) acts as a switch. The Arduino sends a "High" signal to the transistor's base through a 1k–4.7k ohm resistor, which then shorts the transmitter's key line to ground.

Interface circuitry to allow typing Morse code directly from a keyboard. PTT (Push-to-Talk): k3ng keyer schematic

If you open a typical K3NG schematic (e.g., from the official GitHub /hardware folder), follow these steps: A common NPN transistor (like a 2N2222 or