K3ng Keyer Schematic Verified Now

Some schematics show a 10kΩ resistor specifically for the straight key input (Pin 7). Straight keys are mechanical switches that bounce. The firmware handles debouncing, but the resistor ensures the logic level is valid. Section 3: The Output Stage – Don't Fry Your Arduino The biggest mistake new builders make is connecting Pin 9 (Key Out) directly to their radio's "CW Key" jack.

Start with the minimal build (Arduino + 2 resistors + 1 transistor + 2 paddles). Once you get a "dit" on the air, add the LCD. Then add the encoder. Then add the PS2 keyboard. The schematic supports it all. k3ng keyer schematic

Plug USB into Arduino. Done.

Locate the 2N2222 transistor. Identify the Emitter (Arrow). Solder that to GND. Solder a 1k resistor from Pin 9 to the Base . Solder a wire from the Collector to your radio's "Tip" of the 3.5mm jack. Solder a separate GND wire to the "Sleeve" of the jack. Some schematics show a 10kΩ resistor specifically for

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. Section 3: The Output Stage – Don't Fry

Put a red box around pins 20 & 21. You don't need them for basic functionality.

While not in the classic schematic, the "Next Generation" K3NG adds an ESP8266. The schematic routes RX/TX (Pins 18/19) to the ESP. This allows you to key via a web browser. Conclusion: Your Map to CW Mastery The K3NG keyer schematic is intimidating only if you look at it as a monolithic diagram. Break it down: It is just five small circuits working together. The Arduino reads switches (paddles), processes your Morse code via the legendary K3NG firmware, and closes a transistor to ground your radio's key jack.