Using photoresistor instead potentiometer

[gasmask]

Hi,

I have an easy problem ( I think ).
I would like to buid this one:
http://www.aronnelson.com/gallery/main.php/v/WGTP/Tone+Control.jpg.html

My problem is that I want to use photoresistor which has 2 pins
instead potentiometer which has 3 pins.
And another problem is that I dont know if 2nd and 3rd pin
are connected.

1. Is there a cross before output?
2. Can I just simply put photoresistor and between output and
photoresistor connect down side of schematic?

[Liquitone]

It looks like pin 2 and 3 are connected yes, and in that case the potentiometer is working like a variable resistor instead of a voltage divider,
so I don't see any reason why your plan with the photo-resistor between the 10n cap and output shouldn't work.

[gasmask]

Thanks a lot.

[pappasmurfsharem]

Might I ask why?

[gasmask]

You asked me why I am building it?
Well, to be honest, my guitar has only
volume control.
And I dont want to open it to do electronics up.
I also prefer to play by my hands and have control
in my feet... it's little bit easier for me.

[pappasmurfsharem]

You asked me why I am building it?
Well, to be honest, my guitar has only
volume control.
And I dont want to open it to do electronics up.
I also prefer to play by my hands and have control
in my feet... it's little bit easier for me.

I mean why modify a tone control with a photo resistor? Rather than a pot.

[gasmask]

You can easily do a foot control...
It is much cheaper than buying/making
pedal as it is made in wah-wahs, whammy
and expression pedals....

[GibsonGM]

I love that idea.  The number one most important thing to me is to be able to adjust my gain by foot, while playing (especially in the middle of a solo!).  The optocoupler method is a great way to do things like this.

[gasmask]

Yes, I agree... I also thought about modulated gain by foot.

I built this schem and it is awesome... if there's light it gives
a lot of treble... But I dont actually know how to put it in the enclosure...
I mean, this is 33k photoresistor, not 50k as in schematic...
But if its rly dark, it gives you over 100k.
So I think I will make a kind of circle around the photoresistor
to get over 50k....

[Liquitone]

I think the 33K would mean the minimal resistance, while the 50k pot is 50k on max resistance and zero ohm on minimal resistance, so you are thinking somewhat the wrong way around.
One way to solve this would be add a resistor in parallel, which would lower it's light and dark resistance, making a circle around the photoresistor would only make getting it to minimal resistance more difficult.
The best way I think would be is using a different value photoresistor, one that measures near zero ohms light resistance and put a 50k to 100k resistor in parallel depending how large it's dark resistance is.

[pappasmurfsharem]

You can easily do a foot control...
It is much cheaper than buying/making
pedal as it is made in wah-wahs, whammy
and expression pedals....

I'm just curious because a tone control would either be bad because you can only really limit the light to adjust tone so in like a BMP tone control you couldn't adjust the tone to a particular spot you would be at the mercy of ambient light or how much light you for blocked. I'm just assuming you would either get really muddy or overly bright with very little fine control in between