I am designing a fan bus to be an integral part of my vcr computer mod and I have a questions about the knob switches (potentiometers). Some of them have 3 wires, I know that one of them is power (5v or 12v) and one is ground. What is the third one? How does these devices control the resistance, mangetic flux, induced current or what? I really want a fan bus that has lots of control options so I want to go this route. I will post pix when it is done. I and found nothing on this relating to how they work. And by the way I do know what a dremel is along with 20 or so other power tools I am just now getting into electrical modding. Thanks in Advance
Let's presume the potmeter you have has 0-1000kohm resistance, okay? The middle wire is ground. If you turn the knob to the right (or left, I don't know exactly), the resistance between ground (G) and the right wire (R) will be 0 ohm, and the resistance between G and the left wire (L) will be 1000kohm. If you turn it the other way down, R will have 1000kohm and L will have 0 ohm resistance. If it's in the middle, the resistance between L and G, and R and G will be 500kohm. Was that any good?
yeah - the third is like a wiper. A variable potential divider if you will. +volts | \ / \ <--------- some other voltage (this can be moved up or down) / \ | 0 volts
