Here is a circuit which can be assembled easily with very few components. This music bell can be used as door bell, cycle bell , car reverse horn and it only requires 3V battery. The core of this circuit is a 3 terminal IC chip which can produce music when properly biased. This IC may looks like a transistor but cant drive a loudspeaker by itself.
The circuit diagram is shown in the figure. For driving the loud speaker, AC 127 NPN transistor is used. The volume of the bell can be adjusted by introducing a potentiometer between transistor and UM66 IC. The circuit works perfectly on 3V power supply. It's important that never give supply voltage above 3V which may leads to boil the IC.
To prepare it .We need
- Resistor - 1k
- IC - IC UM66
- Transistor-AC127
- Battery -3V
- Loudspeaker.
(you can also used IC555 but there are problem occurring in it.likely bell not ringing or etc. )
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