A
preset is a three legged electronic component which can be made to
offer varying resistance in a circuit. The resistance is varied by
adjusting the rotary control over it. The adjustment can be done by
using a small screw driver or a similar tool. The resistance does not
vary linearly but rather varies in exponential or logarithmic manner.
Such variable resistors are commonly used for adjusting sensitivity
along with a sensor.
The
variable resistance is obtained across the single terminal at front and
one of the two other terminals. The two legs at back offer fixed
resistance which is divided by the front leg. So whenever only the back
terminals are used, a preset acts as a fixed resistor. Presets are
specified by their fixed value resistance.
PIN Diagram :
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