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Door Bell Circuit Schematic Diagram (SI4425BDY)

2016-02-21 20:51  
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This article describes the Door Bell Circuit Schematic Diagram (SI4425BDY). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:SI4425BDY.

This doorbell circuit diagram are consist of two NE555 timer ICs. When some one presses switch S1 momentarily, the loud speaker sounds a bell tone as long as the time period of the monostable multivibrator built around IC1. When the switch S1 pressed, IC1 is triggered at its pin 2 and output pin 3 goes high for a time period previously set by the values of POT R4 and POT R5.When the output ofIC1 goes high it resets IC2 and it starts to oscillate to make a bell sound through the speaker. The IC2 is configured as an astable multivibrator whose oscillation frequency can be varied with the help of POT R5. By adjusting the values of R4 & R5, modifications on the tone are possible.

Power the circuit from a 9V battery or 9V DC power supply. Switch S1 is push button switch.

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