electronic doorbell using UM3481

The heart of this circuit is the UM3481 IC which can be powered by a 1. 5 volts battery and can be used for electronic doorbell, toys, melody clock, music box, etc. The UM3481 IC is designed to play the melody according to the previously programmed information and is capable of generating 16 songs with 3 instrument effects : piano, organ and ma
electronic doorbell using UM3481 - schematic

ndolin. Other features of the UM3481 dorbell circuit are : 8 beats selectable, low standby current, 3 timbres : piano, organ, and mandolin, up to 16 songs ¬ 5 tempos available through mask setting, 14 tones selectable. The IC accepts a input voltage up to 5 volts but typically work powered by 1. 5 volts. The speaker used in this door bell circuit project must have an 8 ohms impedance.

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