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Potentiometers, or "Pots" for short, have three terminals with the center terminal being a center tap contact or "wiper" that slides across an element of constant resistance. As the wiper moves along the element, the resistance from the end terminals to the wiper changes. If the total resistance of the pot is R and the resistance from the left terminal to the wiper is Rleft and from the right terminal to the wiper is Rright, then we have that R = Rleft + Rright is always satisfied, and each of Rleft and Rright can vary from 0 to R. Some rotary pots are "multi-turn," meaning that the knob must be turned several rotations to move the wiper its full range, and some are "single-turn." The former are common for fine gain adjustments on circuit boards, and the latter are common in sensors of shaft angle and knobs for human input. Some pots have a "linear taper," meaning that the resistance from the terminals to the wiper changes linearly with the amount of rotation (for a rotary pot) or translation (for a linear or slide pot), and others have a "logarithmic" or "audio taper," meaning that the amount of resistance changes logarithmically with the motion. This is useful for audio equipment, as our perception of sound volume increases linearly with a logarithmic increase in sound power. Make sure the pot you use has the correct kind of taper for your application![[Image:potentiometersymbol.png|left]] Potentiometers, or "Pots" for short, have three terminals with the center terminal being a center tap contact or "wiper" that slides across an element of constant resistance. As the wiper moves along the element, the resistance from the end terminals to the wiper changes. If the total resistance of the pot is R and the resistance from the left terminal to the wiper is Rleft and from the right terminal to the wiper is Rright, then we have that R = Rleft + Rright is always satisfied, and each of Rleft and Rright can vary from 0 to R. Some rotary pots are "multi-turn," meaning that the knob must be turned several rotations to move the wiper its full range, and some are "single-turn." The former are common for fine gain adjustments on circuit boards, and the latter are common in sensors of shaft angle and knobs for human input. Some pots have a "linear taper," meaning that the resistance from the terminals to the wiper changes linearly with the amount of rotation (for a rotary pot) or translation (for a linear or slide pot), and others have a "logarithmic" or "audio taper," meaning that the amount of resistance changes logarithmically with the motion. This is useful for audio equipment, as our perception of sound volume increases linearly with a logarithmic increase in sound power. Make sure the pot you use has the correct kind of taper for your application![[Image:Potsarevariableresistors.png]][[Image:Potsarevariableresistors.jpg]][[Image:Potsarevariableresistorstypes.png]]* '''Hollow-Shaft Pots''' - These are used in place of shaft potentiometers when space is limited. They are very thin (~3mm) and mount around a rotating shaft. * '''Hollow-Shaft Pots''' - These are used in place of shaft potentiometers when space is limited. They are very thin (~3mm) and mount around a rotating shaft. [[Image:Potsarevariableresistorstypes.png]]