Connect the phototransistor collector to the rig’s positive key line and the emitter to the rig's ground. NPN Transistor Method (Alternative)
However, a standard, basic schematic exists, focusing on the essential components needed to make the keyer function. 1. The Brain: Arduino Board
In the world of amateur radio, few open‑source projects have captured the imagination of CW operators quite like the K3NG Arduino‑based CW (Morse Code) keyer. Conceived by Anthony Good (K3NG), this feature‑rich electronic keyer rivals commercial units that often sell for many times its cost, while offering a level of flexibility and customization that is rare in the hobby. Whether you are a seasoned contester, a QRP homebrewer, or a Morse code novice, the K3NG keyer can be tailored to fit your exact needs.
Connected to the tip of the output jack to the transceiver. Ground: Output jack sleeve to Ground (GND). 4. Sidetone/Audio Speaker: A small 8-ohm speaker or piezoelectric buzzer.
House your keyer in a metal/aluminum box. Ensure the box is connected to the circuit's ground plane.