Musical doorbell project for students

Components using in this projects are :-

UM66 ic - 1
BC 547 - 1
Glass epoxy board - 1
Self lock switch - 1
1x2 Screw terminal - 1
Speaker - 1
100 ohm resistor - 1
9v battery + cap - 1



UM66T is a melody IC. It is basically intended for use in Telephones, toys, bells etc. There is one inbuilt tone and a beat generator in this ic. The tone producer is a programmed separator which produces certain frequencies. These frequencies are a part of the oscillator frequency as well as the beat generator is also a programmed divider which includes 15 available beats. Four beats of these can be selected.
When power is turned on, then melody begins from the first note as well as melody generator is reset. The external npn transistor which is connected to the output of UM66 can drive to speaker.

There are so many versions of UM66T are available today which produce tone of different songs. For example, UM66T01 generates tone for songs ‘Jingle bells’, ‘Santa Claus is coming to town’ and ‘We wish you a merry X’mas’.



Circuit diagram :-

Circuit Layout :-




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