Here is a Mini project for students. This is a simple battery operated Music bell circuit that generates a sweet melody for one minute when it is triggered. It uses the ROM IC UM66 to produce the melody. The music stops automatically.A push switch is used to trigger the circuit. When the push switch is pressed momentarily, NPN transistor T1 conducts and pull the base of T2 and it also conducts. When T2 conducts, C1 charges and provides power to IC UM66. Zener diode ZD is used to regulate the supply voltage to UM66 to 3 volts. When UM 66 gets 3 volts supply, it oscillates and the music tone from it will be amplified by T3 which can be heard through the speaker. Use a small 2 inch speaker.
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