Electric Door Bell

  • 100% Output Guaranteed
  • Free Shipping
  • Cash on Delivery
In Stock
Rs. 960.00
Ex Tax: Rs. 960.00
Brand: Orion iTech Solutions
Product Code: SB01/EE108

Available Options


This project  is  a simple electronic doorbell circuit powered by a battery source ranging from 6 volts to 12 volts. This doorbell circuit is powered by a 555 timer IC operated in monostable mode. The use of the timer IC is to set the time delay for the doorbell to ring. The 100K resistor and 33uF capacitor sets the time delay about 3.6 seconds of continuous ringing. Increasing the value of resistor and capacitor increases the time delay about the product of resistor-capacitor combination times 1.1 (1.1RC).

The switch S1 is a push button that will activate the electronic doorbell. The 10K resistor across the S1 and supply voltage provides protection of false triggering of 555 timers.
The buzzer to be used must be self-oscillated type or having a built in oscillator for this doorbell circuit to function well.

For persons with some problem in hearing, you can modify the doorbell circuit by replacing the buzzer to LED and 150 ohm resistor (see diagram below), or you can put this LED and resistor in parallel to buzzer for better functionality. The LED is preferably blinker type, but an ordinary one is just okay.



Write a review

Please login or register to review


Q1. Why we have used 555 timer IC in this project?
Ans2. We have used 555 timer IC to set the time delay for the doorbell to ring. The 100K resistor  and 33uF capacitor sets the time delay about 3.6 seconds of continuous ringing.

Q2. How we can change the time delay of the ring?
Ans2. Just by increasing the value of resistor and capacitor increases the time delay about the product of resistor-capacitor combination times 1.1.

Q3. What is the advantage of using this project?
Ans3. The advantage of this project is very cheap, reliable and efficient door bell and can be used in different fields and location according to the need.

Q4. How we can enhance this system?
Ans4. We can enhance this system by adding one more 555 timer to this circuit.

Q5. What is the mode/configuration of 555 timer IC used?
Ans5. The 555 timer IC is used in an astable multivibrator mode.