Siren/megaphone revamp to Alarm Siren
thingiverse
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
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