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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