DIY doorbell(s)

From the MAKE Flickr pool

Ryan made this doorbell unit with customizable melodies –

My homebrew doorbell circuit. ATMEGA8 with 2 L293D push/pull driver chips running each of 12 solenoid-driven christmas bells. Songs are stored in EEPROM, and selected randomly when the doorbell is rung

Ringtones aren’t just for cellphones anymore! – Link

For more info check out his helpful video explanation of the project – Link

Related:

Wine glass door bell – Link

The doorbell that plays WAVs – Link