K3ng Keyer Schematic -

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.

Supports iambic modes (A, B, Ultimatic), memory macros, serial terminal control, and QRSS.

: Wired to a digital pin to put the keyer into configuration mode, allowing settings to be adjusted via Morse code audio menus. 2. Transmitter Keying Line (Galvanic Isolation)

For total electrical isolation between the Arduino and the rig, use an optocoupler (like the 4N25 or 4N35). The Arduino drives the internal LED, which optically triggers the output phototransistor, keeping your transceiver safely isolated. 3. Sidetone Audio Circuit k3ng keyer schematic

A common point of confusion is the analog button matrix. In the generic K3NG schematic, a 10kΩ resistor is connected from +5V to the analog_buttons_pin . The "Command" button is then the first button connected to this pin. Following that, each memory button is separated by a 1kΩ resistor before connecting to the same analog line. When you press a button, it creates a specific voltage divider, creating a unique voltage that the Arduino's ADC can read. This design allows the keyer to distinguish between up to 12 different buttons using just one pin.

If you want an audible sidetone, install the sidetone transistor stage. The nKeyer schematic uses Q2 (2N2222) with a 1 kΩ series resistor from an Arduino pin (e.g., D12) to the base, and a speaker connected from collector to GND. An optional 100 µF capacitor (C5) in series with the speaker blocks DC.

D8 (Key Out) ------[1k]----- Base of 2N2222 Emitter ---- GND Collector ---+----- to Radio Key Input | [10k]--- +5V (pull-up, if needed) (for radios that need high) This public link is valid for 7 days

Elias rummaged through the drawer, pushing aside ancient crystals and strange connectors, until his fingers brushed a small, blue circuit board. An Arduino Nano, still in its anti-static bag.

the features you built into your schematic (e.g., #define FEATURE_POTENTIOMETER , #define FEATURE_LCD_I2C ).

Similarly, a rotary encoder with a built‑in push button is a popular method for adjusting speed and navigating menus. The typical schematic connects two encoder pins to digital inputs (with pull‑up resistors) and the push‑button to a third digital input. An R/C low‑pass filter (e.g., 1 kΩ and 0.1 µF) can be added to debounce the encoder outputs, though the software also provides software debouncing. Can’t copy the link right now

The K3NG Keyer is not a single fixed schematic but a around an Arduino (Uno, Nano, Mega, Teensy, etc.). It supports:

Which features (e.g., LCD, Keypad) are essential for you? What type of transceiver you are keying? I can give you a more specific wiring diagram! Share public link