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audio vox

Discussion in 'Radio and Communications' started by zed1115, Oct 12, 2017.

  1. zed1115

    zed1115 New Member

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    good day sir
    can you please helf me to get an ic that im going to use in autovox for mini audio sensing
     

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  2. magvitron

    magvitron Active Member

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    Location:
    John Lennon !magine land.
    Good day sed,
    Can you be more descriptive of the problem?
    1. Do you want to know the part number of a "part number rubbed off" chip?
    2. Do you want to design a circuit to sense audio?
    Regards,
    Manu
     
  3. zed1115

    zed1115 New Member

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    i want to build audiovox using this ic but i dont know what ic i can use it? if detect small noisy or low voice triger the pin 6 is out put.

    pin 1 sensitive input audio
    pin 4 Ground
    pin 6 out put voltage when detect signal
    pin 8 is vcc 5volt

    sir what ic i can use?
     
  4. dave miyares

    Dave New Member

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  5. ChrisEHunter

    ChrisEHunter New Member

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    Why not design your own vox switching circuit? There isn't a dedicated "vox chip" - I have used just a couple of transistors for this purpose. You have to be aware that a crude sound operated switch will respond to ANY sound that's loud enough for the circuit to detect.

    A proper Vox circuit uses stages of audio filtering and noise cancellation techniques to prevent false triggering. The last Vox that I designed for a radio communications manufacturer used three quad op-amps, two FETs, a comparator IC and a bipolar transistor. The circuit is patented, so I can't post it here (it would be too complicated for you to copy, anyway!).

    Look at simple "sound operated switch" circuits.
     

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