K3ng Keyer Schematic Repack High Quality Jun 2026

VE3XYZ (fictitious callsign), a retired EE. The Goal: A field-day keyer with memory banks and a 4-line LCD. The Problem: Original schematics from 2017 showed conflicting pin assignments for the LCD’s RS and E pins. The Solution: He downloaded a “Repack 2024” from Groups.io that included a color-coded wiring diagram for the HD44780 LCD in 4-bit mode. The repack also consolidated the 5V regulator circuit (LM7805) onto the same sheet. The Result: From printing to first CW contact: 3 hours. No magic smoke.

Usually an Arduino Nano (for portable builds) or Mega 2560 (for full-featured builds). k3ng keyer schematic repack

Over the years, several variations and upgrades have been made to the original K3NG keyer schematic. Some of these modifications include: VE3XYZ (fictitious callsign), a retired EE