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  1. #1
    Full Member level 3
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    Help me build an audio detector that will produce DC voltage when audio is detected

    hi,
    do anyone has suggestion for me to built a audio detector cct whereby the cct will produce a dc voltage at presence of audio and 0V wen no audio detected over tht line....


    Thanks

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  2. #2
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    Re: Audio Detector

    using diode and R, C can do it!!

    like AM demodulator.



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  3. #3
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    Re: Audio Detector

    you can use LM324 to construct a AC couple amplifier,

    then rectify the output signal use a 1N4148 diode,

    and filter the retified waveform use a parallel

    RC network.


    best regards





    Quote Originally Posted by danesh
    hi,
    do anyone has suggestion for me to built a audio detector cct whereby the cct will produce a dc voltage at presence of audio and 0V wen no audio detected over tht line....


    Thanks



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  4. #4
    Full Member level 3
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    Re: Audio Detector

    i kind of use the line for both switching and routing the audio signal



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