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RTTTL or RING TONE Player is a simple circuit that can play up to 5 songs preloaded in a microcontroller. The songs are stored in an #include file named "SONG.INC", which you can easily modify according to your preferences.I upload a new schematic whit a phone interfase to play a song  as a bell for you phone  

RTTTL or RING TONE Player is a simple circuit that can play up to 5 songs preloaded in a microcontroller. The songs are stored in an #include file named "SONG.INC", which you can easily modify according to your preferences.

I upload a new schematic whit a phone interfase to play a song  as a bell for you phone