Sound "crackles" when volume is increased and decreased

[Thad E Ginathom]

CTC..Carbon Tetra Chloride...it is available at a chemist

This stuff used to be (is?) used as dry-cleaning fluid, I think?

It is not much fun to inhale: use in a well ventilated place.

If you haven't already figured it out, a variable resistor should be a two terminal device, and the resistance between the two pins would be variable.

A potentiometer is a three terminal device. with a fixed resistance between two pins, and the third pin somewhere in between, depending on the positition of the slider/wiper.

You can make a variable resistor out of a pot by just not using the third terminal

Yes, I got as far as that, but without much understanding as yet. I've barely started on the site I mentioned above...

No thanks button on your post, so Thanks!