Doorbell circuit using NE555 IC

  
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The main part of this circuit Doorbell two timer NE555 ICs. When someone hit the switch S1 momentarily, the speaker emits a sound of the bell, if the time period of the monostable multivibrator built around IC1. When the switch S1 pressed, IC1 is enabled in your pin 2 and pin 3 output is high for a period of time previously set by the values of R4
Doorbell circuit using NE555 IC - schematic

and POT POT R5. When ofIC1 restores the IC2 output is high and starts to swing 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 and R5, changes in tone are possible



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