For further help, the Radio Artisan Groups.io is the primary hub for troubleshooting and community-shared schematic variants.
Since most modern rigs use positive keying voltages, a simple NPN transistor works best. k3ng keyer schematic repack
| Mistake | How Repack Helps | |---------|------------------| | Using wrong pins for PTT vs. CW | Table shows which pins are PWM-capable if needed | | Forgetting pull-up resistors on encoder | Schematic includes explicit 10k resistors | | Connecting LCD to D0/D1 (serial interference) | Warns against using TX/RX pins for parallel LCD | | Overloading 3.3V pin on Nano | Shows separate 5V rail for display backlight | | No common ground between keyer and rig | Highlights mandatory GND wire in output cable | For further help, the Radio Artisan Groups