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UM66 melody generator is a simple and easy DIY project which is suitable for beginners and hobbyists. The circuit can be used as a doorbell, musical alarm, musical bell, etc. The Um66 IC requires no any additional components for the generation of audio signals, it already has an inbuilt tone.
The electrical signals of the corresponding notes of the melody tone will be generated at the output pin 3 of the Um The audio signal output is connected to the base of the transistor.
The transistor amplifies the signals enough to drive a loudspeaker. The operating voltage range of the IC is 1. So a 3V battery is enough to operate the circuit. Your email address will not be published. Ultrasonic automatic braking RC car project. Arduino toggle push power on off switch. Servo control by push button switch arduino. Importance of Earthing in Electrical Installations? Power Factor Improvement using Capacitor Bank. Why fuse wires are always thin?
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Melody Generator using IC UM66
The main objective of the doorbell circuit is to convert electrical signals input into audio signals output with a single press of a switch. The circuit given below is a modified version of the Melody Generator Circuit, whose link is given above. In the previous circuit you had to keep the switch manually pressed for making the IC play the full music. The time for the IC to play depends on discharging time of C1 which can be set by R1. Set R1 to select your time, whether full tone or a part in one press. Transistor Q2 drives the speaker.
DoorBell circuit using UM 66 IC
Musical Calling Bell. By Kalyan Prodhan. Connection Diagram. Component List with cost Approximate. Component Description IC and Transistor. Modification for adaptation.