Musical Doorbell Circuit Diagram
This musical doorbell circuit uses UM3481 A series IC. It is intended for applications such as toys, door bells, music boxes, melody clock/timers and telephones. The UM3481A 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 mandolin.
|LS1||4Ω 0.5W Speaker|
|PB1||Push to On Switch|
|IC1||Um3481A, UM3482A or UM3483A|
This circuit has very low stand-by current. C1 and R1 act as the timing components for the built in oscillator. This IC also includes a preamplifier which provides a simple interface to the driver circuit. Q1 is used for driving the speaker.
When you push the PB1 switch, playing one song and it is auto stop.
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