81A1A-B28-A20L

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Rotary Potentiometers and Rheostats

Rotary Potentiometers (also sometimes referred to as Rheostats) were first introduced in the early 1900’s as a means to control voltage and current in a certain application. Over the years, this technology has changed and evolved to include more advanced features and capabilities. The most common type of Potter’s wheel potentiometers are the 81A1A-B28-A20L series. These are typically used in applications such as audio equipment, medical equipment, power supplies and industrial control systems.

Application Field

One of the primary uses of the 81A1A-B28-A20L potentiometer is providing analog signals in multichannel applications. Setpoints are used to control the rotation of a dial which then outputs a buffered signal to multiple channels in the application. Medical devices may also employ these potentiometers for application in laboratory settings to monitor the conductivity of liquids, or for adjusting the temperature of a laboratory environment, or to control the amount of power supplied to a device. Power supplies may employ the 81A1A-B28-A20L in order to balance the voltages and currents that they supply, as well as for setting a voltage or current limit.

Working Principle

Potentiometers work by altering the resistance value between two points. This is done by using a mechanism composed of a wiper contact and a resistive element, usually composed of Carbon. The wiper contact makes contact with the resistive element, and as it rotates, the resistance of the element changes. The 81A1A-B28-A20L have a shaft that can rotate up to 290°, allowing for precise control of the resistance between two points. This is then used to convert a variable input to a proportional output signal.

Rheostats work similar to potentiometers, but instead of providing an additive output signal, they provide a subtractive output signal. The rheostat utilizes three contacts, where the resistance varies as the first wiper contact rotates, while the other two contacts remain constant. This is often used in applications where precise control is required, or where a maximum current is needed for an application.

Conclusion

The 81A1A-B28-A20L rotary potentiometers and rheostats have proven to be reliable and versatile components in many applications. Their design and uses depend on the specific needs of the application. Whether it’s for audio equipment, medical equipment, power supplies or industrial control system, these components are suitable for the job.

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