K3ng Keyer Schematic Repack -

K3NG Keyer is a highly versatile, open-source Arduino-based CW keyer project. "Repacking" its schematic typically refers to simplifying the wiring for a compact build or adapting the pins to a specific hardware profile. Core Schematic & Wiring

Block B: Transmitter Keying Interface (The Optocoupler Approach)

When using the K3NG code for a repacked hardware build, you must edit the keyer_features_and_options.h file. FEATURE_COMMAND_BUTTON Enable: FEATURE_POTENTIOMETER Disable: FEATURE_LCD_DISPLAY (to save space and power) Disable: FEATURE_MEMORIES (unless you add extra buttons) Pro-Tips for a Clean Repack k3ng keyer schematic repack

A standard K3NG keyer build generally requires the following components:

: Connect a small piezo buzzer or speaker to the sidetone pin (often ) to hear your code. Google Groups Software Repack: Key Configuration Files K3NG Keyer is a highly versatile, open-source Arduino-based

+--------------------------------------------+ | 5V/3.3V Regulator | +---------------------+----------------------+ | v +------------------+ +-----+------+ +-------------------+ | Paddle Inputs |-->| |<--| Speed Potentiometer| +------------------+ | | +-------------------+ | ATmega328P | +------------------+ | (Nano) | +-------------------+ | LCD/OLED Display |<--| |-->| Opto-Isolated PTT | +------------------+ +-----+------+ +-------------------+ | v +-----+------+ | Audio Amp |--> Speaker/Sidetone +------------+ Power Supply Section

Place a flyback diode across the output lines to safeguard the circuit against voltage spikes from older vacuum tube rigs. Sidetone Audio Section | | Regulator | USB 5V / Uno

Component choices & layout

A critical requirement for a schematic repack in the amateur radio context is RF filtering.