91A1A-B28-B12L

Rotary Potentiometers, Rheostats

The 91A1A-B28-B12L is a type of rotary potentiometer. A rotary potentiometer is a type of variable resistor that utilizes a contact that moves across a circular track as it is turned. This type of device can be used for varying purposes, such as controlling the gain of an amplifier, adjusting the frequency of an oscillator, adjusting the output of a motor, and controlling the volume of music. Rheostats are also rotary resistance devices and are very similar to potentiometers, but rheostats utilize only two terminals instead of three.

Application Fields

Potentiometers and rheostats have countless applications and are used in many different industries. For example, they can be used to adjust the voltage in power supplies, to regulate heating and cooling systems, to regulate audio levels, and to regulate motors. They are also used in a wide range of medical devices, including pacemakers, hearing aids, and dialysis machines. In addition, they are used in household appliances, such as ovens, refrigerators, washing machines, and vacuum cleaners. They are also used in laboratory equipment, such as microscopes and other research equipment.

Working Principle

The working principle of a rotary potentiometer is fairly simple. When the wiper contact is adjusted along the circular track, the resistance between the two terminals will change. This change in resistance will affect the current flowing through the device, which will cause the voltage drop across the two terminals to change. This change in voltage will cause the output voltage to vary, thus controlling the gain of an amplifier or the frequency of an oscillator. The same principle is used with rheostats, but with two terminals instead of three.