door bell circuit


Posted on Feb 5, 2014

Here is a very simple project of a door bell circuit. The heart of the circuit is UM66 melody IC which is a great and very famous melody IC, comes in TO-92 transistor package. The IC has only three pins and it is a complete melody system requires no external components only connect 3 volt batteries (any size) and a small piezo and it will start g


door bell circuit
Click here to download the full size of the above Circuit.

enerating pleasing melody. Now a days this IC comes in variety of different melodies. The transistor BC 548 is used to amplify the output of the IC to drive an 8 ohms speaker.




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