K3ng Keyer Schematic !!link!! <100% SIMPLE>

Connect Pin 2 (Cathode) of the optocoupler to Arduino Ground.

A very common and satisfying first build is a compact, USB-powered keyer using an Arduino Nano. This project leverages the schematic and parts list from the nKeyer.

Ensure your command buttons and paddles are cleanly making contact with GND. If you bypass the internal code pull-ups, you must add physical 10k-ohm resistors between the digital pins and the +5V rail. k3ng keyer schematic

Connect to Arduino Pin A5 (on Nano) or Pin 21 (on Mega). PS/2 Keyboard Interface Want to type your CW exchanges on a standard keyboard?

To take full advantage of the sequencer feature or to enable every possible software option simultaneously, many experienced constructors recommend using an Arduino Mega 2560. Its vast flash memory and numerous I/O pins can accommodate the full feature set without hitting memory limits, making it the choice for the ultimate, no-holds-barred K3NG keyer. Connect Pin 2 (Cathode) of the optocoupler to Arduino Ground

The basement shack smelled of rosin and stale coffee. Elias, a veteran amateur radio operator (callsign K1ABC), was staring at his latest project with the kind of frustration usually reserved for a broken amplifier tube.

Open keyer_pin_settings.h to see which pins are assigned to which functions. You can change these to match your specific schematic design. Ensure your command buttons and paddles are cleanly

(Note: The pin configuration can be changed in the keyer_pin_settings.h file.) Component List for Basic Assembly 3.5mm Stereo Jack (Paddle) 3.5mm Mono Jack (Key Out) 2N7000 MOSFET (recommended) or 2N2222 NPN Transistor 10kΩ Potentiometer Pushbuttons (for memories) Resistors: 1kΩ, 10kΩ (pull-ups for buttons/paddles) Tips for Building the K3NG Keyer

keyer_hardware.h : To select your specific hardware profile (e.g., standard Arduino vs. specialized PCB).

Use a 2N2222 or 2N3904 NPN transistor.

Connect the Encoder A and B phases to any two available digital pins (e.g., D6 and D7).