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Thread: Converting an Audio Signal to a Voltage

  1. #11
    FLAC ukchris's Avatar
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    No, I tried and failed. A guy I know who is a real electronics guy is working on it now.

  2. #12
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    Quote Originally Posted by ukchris View Post
    No, I tried and failed. A guy I know who is a real electronics guy is working on it now.
    You can try something called a VOX (or voice activated switch). I have a schematic at home, it just needs a little modification to make it work as you suggest. Can be built for much less than the David Navone piece. I just haven't had time to sit down, build, and test the thing, but in theory, it should work.

    Michael
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  3. #13
    FLAC ukchris's Avatar
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    I have a couple of schematics for VOX circuits, even tried soldering one up but it didn't work for me. I don't know enough about the electronics to determine why. I'm not bad at sticking the bits together if someone can tell me what bits work, the ones in the circuit I followed didn't.

    Chris.

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    Quote Originally Posted by ukchris View Post
    I have a couple of schematics for VOX circuits, even tried soldering one up but it didn't work for me. I don't know enough about the electronics to determine why. I'm not bad at sticking the bits together if someone can tell me what bits work, the ones in the circuit I followed didn't.

    Chris.
    What happened/what didn't work about it? DId you modify the circuit at all?

    Michael
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

  5. #15
    Car Audio Moderator durwood's Avatar
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    PAC Audio makes a TR4 or a TR7 that MIGHT work. Maybe your audio signal voltage level might be too low though. Have you measured what the output AC voltage is of your audio signal with a multimeter? What is the minimum voltage level your VOX will work at?

  6. #16
    Maximum Bitrate psyrex's Avatar
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    If you scroll to the bottom of this page: http://www.doctronics.co.uk/4016.htm

    It gives a possible application for the 4016 IC, but the first half of the circuit coverts audio into a voltage. Might be useful, and you can probably make it for less than a $2-3 if you have an electronics store nearby.
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  7. #17
    FLAC ukchris's Avatar
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    My problem is I have none of thses bits so I end up spending $20-30 at Digikey to get going. If any of you are willing to make me such a circuit I'd be happy to make it worth your while.

  8. #18
    Maximum Bitrate psyrex's Avatar
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    Sorry, I don't have time (I'm at my last year of mechanical engineering at UC Berkeley! woot!), but I can help out with schematics and adding features if you like.
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  9. #19
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    Newbie, here.

    I want bluetooth and gps from a carputer. I've got an old mac laptop sitting around; should work fine.

    I want to use my headunit; the best way to integrate the sound into the headunit, in my opinion, is to use some sort of auto mute to break the signal from the speaker output on the HU. This should work for all carputer output - navigation and bluetooth phone calls.

    I've found some standalone auto mute relays in the UK; this seems like the easiest way to do this and integrate with a factory HU. Does anyone know of any US distributor for a standalone auto mute sensor that's installed between the output of the HU and the speakers?

    This seems to be what you are talking about in this thread.

    Thanks.

  10. #20
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    best way to do what you're describing involves a mixer and maybe a mute circuit
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