K3ng Keyer Schematic -

: A simple NPN transistor switch (like a 2N2222) or an optocoupler to isolate the Arduino from the radio's key jack.

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At the heart of this project lies the . For many new builders, looking at this schematic for the first time can be intimidating. It looks like a spiderweb of resistors, capacitors, transistors, and an Arduino Mega or Uno. k3ng keyer schematic