Tone Generator-Ding-Dong Bell

jacky November 22, 2011 6 Comments

Tone Generator Circuit

Description

Here we present a simple and low cost tone generator circuit, a ding dong bell suitable for calling bell purposes.It is made around IC 8021. It is an 8 pin IC but only four pins are shown here. 8021 has an in-built circuitry to produce ding dong sound each time its pin 3 is pulled low. The sound is stored in a 4 bit ROM. A complementary-pair, two-transistor amplifier is used to amplify the sound to a fair level of audibility. A piezoelectric tweeter or an 8-ohm, 500mW speaker  can be used at the output.

Each time when 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 produced, it has no effect whatever and the two ding-dong bell sounds will be invariably produced.S1 is the ON- OFF switch. Assemble the circuit on a good quality all purpose PCB.Don’t forget to use an IC holder for IC 8021.

Tone Generator Circuit Diagram.

Tone Generator Circuit

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Comments
  • GOPAL WASULE
    January 27, 2014

    i want to create sound of drum but i can not undastant to how to make this sound please give me adv,s

  • Seetharaman
    February 26, 2011

    Hi Sinclair kindly go through the following site you will get full data.
    http://pdf1.alldatasheet.net/datasheet-pdf/view/226298/ETC2/8021-2.html

  • February 25, 2011

    I can find no data on the 8021-2 chip for the tone generator ding dong.
    Who makes it?
    How do I get a data sheet?
    Where is it available?
    What sort of sounds is it capable of producing?
    Could it for instance make a sound like a commercial doorbell a la “Avon calling”
    Thanks

  • patrick vaz
    January 18, 2011

    Hi Admin,
    Any circuit ideas for a ding dong bell, but should sound like in the church!!!

    Thanks

  • July 11, 2008

    circuit on a good quality all pupose

  • July 11, 2008

    dong sound is produced twice. If you

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