Siren/megaphone revamp to Alarm Siren

I took apart a classic style horn to make it a security deterrent. Simply remove not needed parts and make solder connections as pictured and add a DC barrel plug. tape off with electrical tape the mounting screws. Came from Harbor Freight but these things are found everywhere.

(Some disassembly and modifications and re-assembly required!) Use original screws for mounting.

Used in Raspberry Pi IoT https://www.thingiverse.com/thing:4992092

Category: Electronics