At the heart of the schematic is an . While the code can run on a Mega for advanced features, most builders use an Arduino Nano because of its small footprint and built-in USB port.
: Often includes a "Command" button to enter programming mode via the paddles. Advanced Hardware Options k3ng keyer schematic
) is used to key the radio. The Arduino sends a "high" signal to the transistor base, which then pulls the radio's key line to ground. At the heart of the schematic is an
Symptom: Your radio keys constantly, except when you press the paddle. Cause: Your radio uses "Active High" keying (common on some homebrew rigs), but the K3NG schematic is "Active Low" (Grounded). Fix: Change the configuration in k3ng_keyer.ino from KEYER_ACTIVE_LOW to KEYER_ACTIVE_HIGH . No hardware change needed. Advanced Hardware Options ) is used to key the radio