Keyer Schematic | K3ng

Arduino Pin → 1kΩ resistor → Transistor Base Transistor Collector → Key Line (to radio) Transistor Emitter → GND A 10kΩ resistor from base to emitter ensures the transistor stays off when the pin is low.

keying circuit (optocoupler) instead of a simple transistor to protect the Arduino. 4. Summary Technical Specifications Implementation Speed Range 1 to 999 WPM Iambic A/B, Ultimatic, Bug, Straight Key Winkey 1.0/2.0 emulation for contest logging USB (5V) or 7-12V via Arduino Vin pin wiring diagram for a particular Arduino model, like the Further Exploration K3NG keyer on ESP8266 - Radioartisan - Groups.io k3ng keyer schematic

Elias tapped the left paddle. A perfectly formed dit rang out through the speaker. Arduino Pin → 1kΩ resistor → Transistor Base