converting line-level audio signal to resistance?

[Mad Scientist Jr]

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...

 

[Ken Taylor]

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...

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

 

[Mad Scientist Jr]

I basically want to control a video game (the paddle controls are 1
MOhm pots connected to 5V DC) with my stereo.
See "paddles"
http://www.hardwarebook.net/connector/userinput/atari2600joy.html

I don't think it has to be zero ohms exactly but a low amount.

Can you direct me to a legend for your ASCII diagram?

Thanks

 

[Mad Scientist Jr]

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

Then I wrote and crossposted to sed:

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>------------+