Potentiometers

What is a potentiometer?



A potentiometer is a variable resistor. Potentiometers enable you to regulate and change the current flowing through a circuit. Potentiometers can also be called pots or potmeters.



Potentiometers have two terminals that are fixed to a resistive element (the track). The resistive element is typically wirewound or made from carbon, cermet or conductive plastic. The third terminal is connected to the wiper, which is a sliding contact. As the wiper moves along the track, the resistance changes and the current flowing through the circuit changes.



Types of potentiometer



Rotary potentiometers are easily controlled by turning a spindle or a knob. Rotary potentiometers can be single turn or multiturn.



Slide potentiometers are also known as slider potentiometers or fader potentiometers. To use a slide potentiometer, it’s simply a case of sliding a fader along a straight track to change the resistance.



Trimmer potentiometers, sometimes called trimpots, are used to calibrate and fine-tune circuits and can be mounted straight onto a PCB (printed circuit board). Trimmer potentiometers are easy to adjust with a screwdriver.



String potentiometers (or string pots) take movement and transform it into an electrical signal.



Membrane potentiometers are completely flat. Membrane potentiometers change their resistance when pressure is applied to the membrane.



Do I need a potentiometer with a linear or logarithmic taper?



The taper you need for your potentiometer depends on the intended application.



For potentiometers with a linear taper, the resistance between one end of the track and the wiper varies at a constant rate. If you turn the potentiometer halfway or slide the fader halfway along the track, the resistance will be half of the total resistance. Linear taper potentiometers are typically used in applications such as light dimmer switches.



For logarithmic taper potentiometers, the resistance does not vary at a constant rate. The level of resistance moves exponentially up or down. A potentiometer that has been turned or moved halfway along its track, will not produce resistance that is half the total resistance. Logarithmic potentiometers are commonly used for audio applications.



What is the difference between a potentiometer and a rheostat?



The key difference is the number of terminals that each device has. Potentiometers have three terminals while rheostats only have two terminals.



Looking for peripherals for your potentiometer?



Potentiometer Knobs

Potentiometer Accessories

Potentiometer Mounting Nuts

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Omschrijving Prijs Maximum Resistance Potentiometer Type Number of Turns Number of Gangs Mounting Type Power Rating Shaft Diameter Electrical Taper Mounting Hole Diameter Element Material Termination Style Tolerance Series Shaft Length
RS-stocknr. 893-1034
FabrikantnummerH-1000-F2-380
FabrikantOhmite
€ 275,36
Each
Aantal stuks
1 kΩ Rotary 1 1 Panel Mount 25W 6.35 mm Linear - Wirewound Solder Lug ±10% H -
RS-stocknr. 893-5099
FabrikantnummerCU5031E
FabrikantOhmite
€ 17,179
Each (In a Pack of 50)
Aantal stuks
50 kΩ Rotary 1 1 Panel Mount 2W 6.35 mm Linear - Carbon Solder Lug ±10% CU 50.8mm
RS-stocknr. 893-5317
FabrikantnummerCMU1041E
FabrikantOhmite
€ 15,023
Each (In a Pack of 50)
Aantal stuks
100 kΩ Rotary 1 1 Panel Mount 2W 6.35 mm Linear - Carbon Solder Lug ±10% CMU 22.2mm
RS-stocknr. 892-6676
FabrikantnummerCU5021E
FabrikantOhmite
€ 25,76
Each
Aantal stuks
5 kΩ Rotary 1 1 Panel Mount 2W 6.35 mm Linear - Carbon Solder Lug ±10% CU 50.8mm
RS-stocknr. 893-5080
FabrikantnummerCMU3521E
FabrikantOhmite
€ 16,503
Each (In a Pack of 50)
Aantal stuks
3.5 kΩ Rotary 1 1 Panel Mount 2W 6.35 mm Linear - Carbon Solder Lug ±10% CMU 22.2mm
RS-stocknr. 892-6660
FabrikantnummerCMU1021E
FabrikantOhmite
€ 20,03
Each
Aantal stuks
1 kΩ Rotary 1 1 Panel Mount 2W 6.35 mm Linear - Carbon Solder Lug ±10% CMU 22.2mm
RS-stocknr. 892-6672
FabrikantnummerCMU5021E
FabrikantOhmite
€ 20,03
Each
Aantal stuks
5 kΩ Rotary 1 1 Panel Mount 2W 6.35 mm Linear - Carbon Solder Lug ±10% CMU 22.2mm
RS-stocknr. 893-5083
FabrikantnummerCLU1031E
FabrikantOhmite
€ 18,297
Each (In a Pack of 50)
Aantal stuks
10 kΩ Rotary 1 1 Panel Mount 2W 6.35 mm Linear - Carbon Solder Lug ±10% CLU 15.9mm
RS-stocknr. 892-2466
FabrikantnummerCU1031E
FabrikantOhmite
€ 25,76
Each
Aantal stuks
10 kΩ Rotary 1 1 Panel Mount 2W 6.35 mm Linear - Carbon Solder Lug ±10% CU 50.8mm
RS-stocknr. 893-4891
FabrikantnummerCMU2521E
FabrikantOhmite
€ 16,503
Each (In a Pack of 50)
Aantal stuks
2.5 kΩ Rotary 1 1 Panel Mount 2W 6.35 mm Linear - Carbon Solder Lug ±10% CMU 22.2mm
RS-stocknr. 892-6679
FabrikantnummerCMU1031E
FabrikantOhmite
€ 20,18
Each
Aantal stuks
10 kΩ Rotary 1 1 Panel Mount 2W 6.35 mm Linear - Carbon Solder Lug ±10% CMU 22.2mm
RS-stocknr. 893-5086
FabrikantnummerCLU2521E
FabrikantOhmite
€ 18,297
Each (In a Pack of 50)
Aantal stuks
2.5 kΩ Rotary 1 1 Panel Mount 2W 6.35 mm Linear - Carbon Solder Lug ±10% CLU 15.9mm