K3ng: Keyer Schematic Repack

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: Connect the Left (Dit) and Right (Dah) lines directly to your Arduino digital pins. Connect the common ground line directly to the Arduino GND. Internal microcontroller pull-up resistors are enabled via code, eliminating external resistors.

Since most modern rigs use positive keying voltages, a simple NPN transistor works best. k3ng keyer schematic repack

The simplest version uses a 2N7000 or BS170 MOSFET. A repacked schematic will show:

A hardware repack is only as good as its matching code configuration. Before flashing your Arduino, open the keyer_features_and_options.h file and ensure the following core features match your repacked schematic: This public link is valid for 7 days

A well-executed schematic repack can bring several benefits to K3NG keyer users, including:

However, builders looking for a clean "repack" (a consolidated, optimized, and modernized version of the original schematic) often struggle to find a single, unified circuit diagram. The original documentation is intentionally modular to support dozens of different Arduino boards and options. Can’t copy the link right now

A is the community’s answer to that puzzle. It is the translator between the infinite flexibility of the Arduino and the physical reality of solder, flux, and blown transistors.

The refers to a comprehensive hardware modernization of the classic open-source K3NG Arduino CW Keyer code . As of April 2026, these "repacks" typically involve transitioning from basic breadboard designs or older ATmega328P (Arduino Uno/Nano) setups to more powerful Arduino Mega 2560 or custom SMD-based PCBs to accommodate the massive feature set of the code . The Core Story: Hardware Evolution

Use a solid ground pour on both the top and bottom layers of your PCB to shield against ambient radio signals.

A basic "repack" should focus on these core hardware modules: