81A2A-B28-A15/A15L Potentiometers, Variable Resistors

Temperature Coefficient:	±150ppm/°C
Mounting Type:	Panel Mount
Bushing Thread:	3/8-32
Actuator Diameter:	0.250" (6.35mm)
Actuator Length:	0.875" (22.23mm)
Actuator Type:	Slotted
Termination Style:	PC Pins
Resistive Material:	Cermet
Adjustment Type:	Side Adjustment
Rotation:	300°
Number of Turns:	1
Series:	81
Power (Watts):	1W
Built in Switch:	None
Number of Gangs:	2
Tolerance:	±10%
Resistance (Ohms):	10k
Taper:	Linear
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tray

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Rheostats and Rotary Potentiometers are two very useful and popular electrical devices in the engineering world. They are used for varying the amount of current, voltage or resistance in a circuit, thus allowing the circuit to be tailored to different parameters and applications. The most commonly used rotary potentiometers are the 81A2A-B and the A15/A15L.The 81A2A-B rotary potentiometer is a two-watt potentiometer predominantly used for audio applications such as volume control, mute and balance stereo. It has a classification of slider type construction and consists of a single turn resistance element. This single turn resistance element allows a total range of resistance to be chosen between 0 and maximum resistance. It is available with a total resistance of 100KΩ, 200KΩ, 500KΩ, or 1MΩ.The A15/A15L rotary potentiometer is typically used in AC motor applications. Like the 81A2A-B, it has only one element but it is able to deliver up to a 15W resistive load at the maximum voltage rating of 400VAC. It comes with a full range of resistance values between 0 and maximum resistance. The most commonly used resistance values are 500KΩ and 1MΩ. Aside from the differences in power load handling ability and resistance values, the general working principle of both the 81A2A-B and the A15/A15L are the same; when the wiper moves along the track, the resistance between the two contact points changes, thus allowing for the resistance to be adjusted. This change in resistance is then used to control the amount of current or voltage present in the circuit. The application fields for these rotary potentiometers are varied and are dependent on the type of potentiometer being used. The 81A2A-B is usually used as a volume control element as well as other audio applications whereas the A15/A15L is more suitable for controlling the current and voltage in motor applications. Aside from current and voltage control, these rotary potentiometers are also used as a way to vary impedance, gain, and attenuation in electrical circuits. They are also used as simple on/off switch devices. In conclusion, there are different types of rotary potentiometers, each of which is suitable for specific applications. The 81A2A-B rotary potentiometer is commonly used for applications such as volume control and audio applications while the A15/A15L is used in AC motor applications. The general working principle of both is the same; when the wiper moves along the track, the resistance between the two contact points is changed, thus allowing for the resistance to be adjusted. Consequently, these rotary potentiometers are extremely useful for all sorts of applications.

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