EVJ-Y81F30B54

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Rotary Potentiometers and Rheostats

Potentiometers and rheostats both are resistors that vary resistance in an electronic circuit. They are both used to control the amount of current in a circuit. The primary difference between them is the type of variable resistor used. Potentiometers use rotary resistors while rheostats use linear resistors.

EVJ-Y81F30B54 is a rotary potentiometer. It is a three-terminal resistor which usually has a control element which is a mechanical shaft or spindle that can be rotated upon its axis. This control element is attached to a resistance track, with two terminals connected to either end of the track and the third terminal connected to the control element itself. As the control element is rotated, the resistance in the track is varied. At one end of the rotation the track resistance would be at its maximum, and at the other end at its minimum.

Rotary potentiometers have many applications and are used in circuits for functions like gain control, volume control, frequency control and other variable control. Some popular uses of rotary potentiometers include:

• In audio processing circuits for controlling the volume level.
• In keyboards for controlling the pitch.
• In telecommunication circuits for attenuating error reduction.
• In modems and test equipment as frequency or gain control.

Rheostats, on the other hand, are linear resistors made up of two terminals connected to a resistance track. Unlike rotary potentiometers, there is no control element and the resistance is varied by manually adjusting the track. They are usually used as a dimmer, for example, in incandescent lightbulbs for controlling the amount of light that emanates from the bulb. Another popular application of a rheostat is to vary the speed of a motor.

Rheostats can also be used in combination with other electrical components to reduce power wastage. For example, when resistors are used in a circuit, rheostats can be used to adjust the resistance to reduce wastage when the current is too high. The same can be said for potentiometers, however, the situation is slightly more complex since the control element must be rotated to achieve the desired level of current.

EVJ-Y81F30B54 is an example of a rotary potentiometer and it is used in a variety of applications. It is an economical substitute with good linearity and temperature performance. It is used for gain control, frequency control and can also be used as a dimmer for incandescent bulbs. It also provides multiple terminations which makes it suitable for a variety of applications.

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