308N100K Potentiometers, Variable Resistors

Temperature Coefficient:	--
Mounting Type:	Panel Mount
Bushing Thread:	1/4-32
Actuator Diameter:	0.125" (3.18mm)
Actuator Length:	0.750" (19.05mm)
Actuator Type:	Slotted
Termination Style:	Solder Hook
Resistive Material:	Conductive Plastic
Adjustment Type:	User Defined
Rotation:	295°
Number of Turns:	1
Series:	308N
Power (Watts):	0.5W, 1/2W
Built in Switch:	None
Number of Gangs:	1
Tolerance:	±10%
Resistance (Ohms):	100k
Taper:	Linear
Moisture Sensitivity Level (MSL):	--
Part Status:	Not For New Designs
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Rotary Potentiometers, Rheostats

A 308N100K rotary potentiometer or rheostat is a device used to measure an electrical current or to control or adjust various electrical functions. The device works through a unique combination of a moveable metal wiper, a coil of wire, and a resistance material. The 308N100K is typically used to measure voltages, change the speed or momentary movement and control the current flow of many devices.

Application Fields

The 308N100K rotary potentiometer or rheostat can be found utilized in a wide variety of applications. Some of these areas include:

• Audio engineering
• Dynamic signal analysis
• Medical equipment
• Test and measurement instruments
• Telecommunications
• Industrial process control
• Computer peripherals
• Home audio devices.

Working Principle

The main component of the rotary potentiometer and rheostat is the wiper, which is essentially a metal piece that rotates and slides to control the resistance. The resistance itself is most often a resistive material applied to a strip of metal or carbon film. As the metal wiper moves along the strip, the resistance varies. This resistance variation is then translated into the desired reading, such as voltage or current.The wiper, or metal piece, is enabled to rotate along a predetermined circumference via two contact pins, which determine the device’s lower and upper limit of movement. The pins themselves are made up of two circular pieces of resistance material and are typically mounted within a non-conductive housing. The output signal of the device is determined by where the wiper is set in relation to the two pins, as each position will yield a different resistance.Additionally, many rotary potentiometers and rheostats feature two other contact pins which are used to measure the changes in voltage or resistance as the wiper moves between the upper and lower limit points. By monitoring the voltage levels through these two contacts, a more accurate reading can be achieved as the pins provide feedback based on the wiper’s exact position.

Conclusion

The 308N100K rotary potentiometer and rheostat is a flexible and reliable piece of technology that is utilized in a wide number of applications. From audio engineering to telecommunications, the device’s ability to measure voltage and control current flow make it a popular choice for many electronics devices. The device’s working principle of two contact pins controlling the movement of a wiper against a resistive material is simple yet effective and helps to make the rotary potentiometer and rheostat a reliable and effective device.

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