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    How do I make an electronic circuit for 300hz frequency

    i was given a task to produce a device that able to produce sound range of (200hz-300hz) with an the amplitude of( 0 - -15dB). i was advised to make my own electronic circuit since the amplitude is too small. i was bump coz i have little knowledge in electronic. Any suggestion would be nice

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    Re: How do I make an electronic circuit for 300hz frequency

    Hi,

    Not much information. Please provide all necessary informations at once, not piece by piece.

    What waveform?
    Fixed frequency? adjustable?

    Amplitude: 0....-15db is a relative value. It means the same as 100% ... 17.8%.
    Or do you mean "sound power level"?

    Something else we should know? Power supply? Portable? Quality?

    For me it sounds that a MP3 player and a 200Hz_MP3_file is all you need.

    Klaus


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  3. #3
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    Re: How do I make an electronic circuit for 300hz frequency

    Hi,

    If this is what you are thinking of, then you could make the classic 555 wailing siren circuit, using a speaker or a buzzer, the output capacitor has an effect on volume. There are plenty of web pages that show this circuit, and it's a simple, easy beginner circuit.

    You can do it with BJT transistors as well, but the 555 is maybe a more documented version.

    Not my speciality: Look into how to convert voltage to dB, this may be of assistance in understanding what you have to do.

    This persons thread may also be of general interest:

    https://www.edaboard.com/thread359962.html#post1541461

    Wailing Siren is here, too:

    http://www.555-timer-circuits.com/


    This is a better choice that the wailing one on 555-timer-circuits:

    http://www.555-timer-circuits.com/police-siren.html

    Or this one (never tried it, I assume it works as they have a video):

    https://startingelectronics.org/begi...wailing-siren/



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