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converting line-level audio signal to resistance?

Discussion in 'Misc Electronics' started by Mad Scientist Jr, Sep 19, 2005.

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  1. Can someone explain how you would take a line level audio signal and
    conver it to resistance in the range of 0 - 1 MOhm? Any help
    appreciated...
     
  2. Ken Taylor

    Ken Taylor Guest

    Three things come to mind - the last two are to amplify it and drive a servo
    motor connected to a 1MOhm pot, the other to run it into a A/D converter and
    then use that to drive a digital potentiometer IC. The first thing is what
    are you trying to achieve?

    Ken
     
  3. AUDIO> is positive or ground or both?
    [C} is capacitor? how much?
    [R] is resistor? how much?
    what is [LDR] ? is this a light sensor ?
    [LDR] has 2 outputs, do these go to the +5v and gnd of the paddle?
    What is the [POT] between Gnd and Vcc? Is this to adjust the gain of
    the audio driving the LED?
    What is Vcc?

    thanks

    Not really. Just view it using a fixed pitch font like Courier and
    if it still doesn't make sense post back with what you don't
    understand.

    +---[R]--+ +---->OUT
    | | |
    | [LED]--> [LDR]
    AUDIO>---[C]----+-----+--|-\ | |
    | | >--+ +---->OUT
    [R] +--|+/
    | |
    GND>------------+ |
    | |
    [POT]<--+
    |
    Vcc>------------+
     
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