Musical horn circuit.


Here is a simple circuit diagram of a simple musical horn using two NE555 ICs. Two ICs are wired as astable mutivibrators. The output of first multivibrator is given to the discharge (pin 7) of the second astable multivibrator. The combined effect of the astable multivibrators produces a musical tone at the output.

 Circuit diagram with Parts list.



  • The sound effect can be adjusted by varying the POTs R2&R5.
  • The speaker can be a 8 Ohm tweeter.
  • The circuit can be powered from a 9V PP3 battery.
  • The ICs must be mounted on holders.
  •  All capacitors must be rated 15V.
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12 thoughts on “Musical horn circuit.

  1. Sheikh Hassam

    Hi sir,
    I am working on clap switch circuit and circuit competition will be on 15 April.
    Specifications are
    “make clap switch circuit using 741 with 9v battery which activates on clap sound.the circuit which detect the faintest clap will be may use other ICC’s along with 741.

  2. rohit

    Hello seetharaman,

    I didnt know where to address it, hence i picked this aritcle.

    Is there a circuit diagram for clap switch activated LED (Preferably 20-30LEDS) mains opreated

    Thanks for all your Advice.

  3. Seetharaman

    Hi Zohaib lots of circuits have appeared in Circuits today, you can use one of them or kindly post your requirement

  4. Namesh

    Can anyone please design a circuit to supply 6v on a clap i.e a clap activated 6v power supply.
    6v output should be continues and show proper relay connections

  5. waagyi

    very good one ,sir
    i m one student of tech in my

    anmar ,asia

    i interest more on wireless control n robot tech



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