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Circuit Description
A multi tone bell is a call bell. It saves up and down trips by distinguishing between calls made from the front door or a side entrance. A circuit with three tones make use of an integrated circuit IC-741 as shown in the circuit diagram.
Circuit Diagram
Components Required
1. Switches SW1, SW2, SW3
2. Capacitor C1 - 0.05µF, C2 - 100µF
3. Resistance-
R1- 33kΩ
R2- 47kΩ
R3- 100kΩ
R4- 100kΩ
R5- 100kΩ
R6- 100kΩ
4. IC 741(operational amplifier)R2- 47kΩ
R3- 100kΩ
R4- 100kΩ
R5- 100kΩ
R6- 100kΩ
5. Transistor T1- AC 187, T2- AC 188
6. Loud Speaker 8&omh;
7. Battery 9v or 12v
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