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Doorbell circuit using NE555 IC

2016-05-03 12:04  
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Doorbell circuit using NE555 IC

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 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


The circuit has to assembled on a good quality PCB or common board.The IC1 & IC2 has to be mounted on IC holders.Power the circuit from a 9V battery or 9V DC power supply.Switch S1 is push button switch. Advertisement: