Making a Simple Music Bell Circuit. This ppt Consists Of both the approach of Theory and the Practical vedio Of the Circuit.

1. MUSIC BELL
CIRCUIT

2. CIRCUIT DIAGRAM

3. CIRCUIT ON PLY BOARD

4. PRINCIPLE OF OPERATION
 This circuits uses very few component and gives
melody sound. It uses 3 terminal IC UM66 and can
be build small enough to be placed inside a
greeting card and operated off a single 3V flat
button cell.
There is not much to the circuit. The UM66 is
connected to its supply and its output fed to a
transistor for amplification. Any common speaker
can be used or a “flat” piezoelectric tweeter like the
one found in alarm wrist watches. If you use the
piezo , then it can be connected directly between
the output pin 1 and ground pin 3 without the
transistor.

5.  The UM66 looks like a transistor with 3 terminals.
It is complete miniature tone generator with a
tune. Now they come with wide variety of
different tunes.
For amplification we have used a NPN transistor
which is BC548. Here BC548 makes a common
emitter circuit. For limiting the base current we
have used a resistance of 220 Ohms so that
transistor will not get damaged by excess
current.

6. CIRCUIT ON BREADBOARD

8. Thank You