K3ng Keyer Schematic Jun 2026

Let’s pretend you want to build the "Minimum Viable Keyer" but using the Official K3NG Schematic v2.0.

Silas shuffled forward, his leather apron creaking. He peered at the schematic printout Elias had taped to the wall. It was a convoluted mess of logic gates and discrete components, drawn on the back of a pizza flyer. k3ng keyer schematic

For high-voltage tube transmitters (e.g., Johnson Ranger), you cannot use a 2N2222. The schematic allows for a 4N25 optoisolator . You bridge the Arduino side with a 330Ω resistor, and the transistor side connects directly to the tube rig's 150V key line. Let’s pretend you want to build the "Minimum

Safely interface Arduino’s 5V logic to the transceiver’s key input (which may be 0–12V, high impedance, or require current sinking). or require current sinking).