2 layers191.3 × 181.7 mm

IO Card G3
PerMalmberg/IO-Card-G3
This is my custom I/O card, third generation. Main purpose is to serve as an alarm system.
400 parts7MIT
KiCad boards from 2 GitHub repositories tagged “alarm”, the most starred first; open any of them in PCBKit.

PerMalmberg/IO-Card-G3
This is my custom I/O card, third generation. Main purpose is to serve as an alarm system.

dilshan/simple-electronic-siren
A simple transistor based electronic siren