Potentiometer code dating
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When a percentage is referenced with a non-linear taper, it relates to the resistance value at the midpoint of the shaft rotation.A 10% log taper would therefore measure 10% of the total resistance at the midpoint of the rotation; i.e.
Potentiometers consist of a resistive element, a sliding contact (wiper) that moves along the element, making good electrical contact with one part of it, electrical terminals at each end of the element, a mechanism that moves the wiper from one end to the other, and a housing containing the element and wiper. Many inexpensive potentiometers are constructed with a resistive element , usually between the other two.Multiple resistance elements can be ganged together with their sliding contacts on the same shaft, for example, in stereo audio amplifiers for volume control.In other applications, such as domestic light dimmers, the normal usage pattern is best satisfied if the potentiometer remains set at its current position, so the switch is operated by a push action, alternately on and off, by axial presses of the knob.Potentiometers are commonly used to control electrical devices such as volume controls on audio equipment.Potentiometers operated by a mechanism can be used as position transducers, for example, in a joystick.Others are enclosed within the equipment and are intended to be adjusted to calibrate equipment during manufacture or repair, and not otherwise touched.
They are usually physically much smaller than user-accessible potentiometers, and may need to be operated by a screwdriver rather than having a knob.
On panel potentiometers, the wiper is usually the center terminal of three.
For single-turn potentiometers, this wiper typically travels just under one revolution around the contact.
They are usually called "preset potentiometers" or "trim[ming] pots".
Some presets are accessible by a small screwdriver poked through a hole in the case to allow servicing without dismantling.
If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.