Crossfader Schematics Explained Please

[Combover]

Hello guys,

I am trying to mod my Technics Crossfader. I have got it working to an extent but it fails when I put electricity and audio through it.

I am trying to keep it as a normal audio fader but to use it as an analogue potentiometer that runs into an aurduino board, then pure data and then via midi to Virtual DJ. I have all the software parts done and as I said it works perfectly when there is no audio running through it. If anyone wants to know how to do this then I can let you know. No problems.

So my problem is that I do not understand how the schematics of the fader works out. On a normal potentiometer I connect the ground to 1, the analogue input to 2 and the 5v output to 3.

What worked without the audio was as the image looks
. .
. Ground . 5 Volts
. .
. Analogue Input .

Can anyone tell me what should be connected to what as I have very little electronics experience and don't understand where any of these circuits are going.
Thanks

**broken link removed**

 

[duffy]

I don't understand what you are trying to do here. What do you mean by "put electricity AND audio through it" - ?

If you are just reducing the audio, pin 1 is ground, pin 2 goes to the amp and pin 3 is the audio input. If it's used as an input to an A/D converter, then you can hook it up to +5V like that -

- but you don't do both!

If you are reading the audio with the A/D input, take the +5V off pin 3 and replace it with just the audio signal. Use the wiper (pin 2, apparently) for the A/D input.

 

[Combover]

I don't understand what you are trying to do here. What do you mean by "put electricity AND audio through it" - ?

I am not trying to gauge the audio output levels into my A/D converter but to use the pot to control 2 outputs. To leave the audio output as normal to my amp and to send a level to my A/D converter.

When I use it as a standard pot my readings are fine.
When I plug the mixer into the mains the readings change and are awkward.
Then when I put audio into one of the chanels all the readings are cut.

I presume the problem is that the audio is inputting a new voltage I am also unsure which are the 1,2 & 3 pins.

When you say Don't do both, does that mean this is not possible ?

Thanks for the help duffy

 

[Lighty]

Bit confused here too, maybe draw a schematic or block diagram explaining it.

 

[Nigel Goodwin]

You can't do it using the single existing pot - you would need a pot with an extra section to it, that doesn't connect to anything else.

 

[Combover]

That's really too bad.
Really appreciate the help, us newbies are trying to learn and stay out of your hair.