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    This simple and cost-effective ding dong electronic doorbell circuit is based on IC 8021-2. The IC has an in-built circuitry to produce ding dong sound each time its pin 3 is pulled low. The sound is stored in the IC as bits, as in a ROM. The sound output from the IC can’t however drive a speaker directly, as this puts strain on the device.

    Therefore a complementary-pair, two-transistor amplifier is used to amplify the sound to a fair level of audiblity. You may either use a piezo tweeter or an 8-ohm, 500mW speaker at the output. This simple electronic doorbell has not been tested.

    During the standby period, the IC consumes nominal current of a few microamperes only. Therefore switch S1 may be kept closed. Each time switch S2 is pressed, ding dong sound is produced twice. If you try to press switch S2 a second time when the first ding dong sound is still being produed, it has no effect whatever and the two ding-dong bell sounds will be invariably produced.

    Doorbell electronic circuit diagram

    doorbell circuit

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    10 Responses to "Electronic Doorbell Circuit"

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    1. Mate, i cant found IC8021-2 nowhere in my city…can something replace it? please help asap

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    2. please answer :P

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    3. i am not able to place a circuit diagram of my music bell here so plz tell me how to do so u can help m to identify the process of my bell circuit

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    4. K. Basil Perera says: on November 18, 2010 at 1:27 pm

      the ic is not avaleble in our country (Sri Lanka) how can i get it

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    5. maryam says: on July 8, 2012 at 1:36 pm

      Internal circuit to control my air conditioner I need you help me? Thanks

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    6. jagriti goil says: on September 26, 2012 at 3:34 pm

      i can’t find ic 8021 in my city..plss can anyone tell me the alternative ic for this circuit diagram

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    7. Sibaram Datta says: on November 2, 2012 at 6:56 pm

      The heart of this ding dong bell project IC 8021-2 is not available in kolkata. P. Marian the author of this circuit, Sir can you tell me please where I can purchase this IC? Otherwide the circuit is nothing to do.

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    8. Fine. Good concept and interesting too. I think it is better to give some more detailed explanation about this circuit. I have another circuit for automatic door bell with object detection. If you are interested about that circuit diagram, then visit http://goo.gl/D26en

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    9. Buddy …!!!
      This ic is usually unavailable.So kindly replace the circuit with more reliable ic.
      thankx

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