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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Description Price 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庫存編號 161-5122
製造零件編號27ESB103MMF50N
HK$38.661
個 (以毎盒:100)
單位
10 kΩ Rotary 1 2 Panel Mount 0.2W 6.35 mm Logarithmic - Carbon Solder Lug ±20% 27 50mm
RS庫存編號 168-320
製造零件編號27ESB103MMF50N
HK$48.38
單位
10 kΩ Rotary 1 2 Panel Mount 0.2W 6.35 mm Logarithmic - Carbon Solder Lug ±20% 27 50mm
RS庫存編號 167-9747
製造零件編號14921F0GJSX13103KA
BrandVishay
HK$160.64
個 (以毎盒:60)
單位
10 kΩ Rotary 1 2 Panel Mount, Through Hole 1W 6.35 mm Linear - Cermet Pin ±10% 149 22.2mm
RS庫存編號 484-9225
製造零件編號14921F0GJSX13103KA
BrandVishay
HK$160.64
單位
10 kΩ Rotary 1 2 Panel Mount, Through Hole 1W 6.35 mm Linear - Cermet Pin ±10% 149 22.2mm
RS庫存編號 522-5131
製造零件編號53RBA-R25-A15/A15L
BrandBourns
HK$110.40
單位
10 kΩ Rotary 1 1 Panel Mount 1W 6 mm Linear - Cermet Solder Lug ±10% 53 25mm
RS庫存編號 172-8059
製造零件編號RK11K1120ABW
HK$9.614
Each (In a Tray of 80)
單位
10 kΩ Rotary 1 - Panel Mount, Through Hole 0.05W 6 mm Logarithmic - - Pin ±20% RK11K -
RS庫存編號 167-9473
製造零件編號157S103MX
BrandVishay
HK$344.989
個 (以毎盒:10)
單位
10 kΩ Rotary 1 1 Servo Mount 1W 3.18 mm Linear - Conductive Plastic Turret ±20% 157 11.1mm
RS庫存編號 790-4259
製造零件編號P13LFL103MAB10
BrandVishay
HK$179.72
單位
10 kΩ Rotary 1 1 Panel Mount 1.5W 6 mm Linear - Cermet Solder Lug ±20% P13 25mm
RS庫存編號 484-8610
製造零件編號14910F0GJSX10254KA
BrandVishay
HK$95.63
單位
250 kΩ Rotary 1 1 Panel Mount, Through Hole 1W 6.35 mm Linear - Cermet Pin ±10% 149 22.2mm
RS庫存編號 172-7660
製造零件編號RK09712200JC
HK$20.83
Each (In a Tray of 80)
單位
50 kΩ Rotary 1 - Panel Mount, Through Hole 0.05W 6 mm Logarithmic - - Pin ±20% RK097 -
RS庫存編號 602-3699
製造零件編號JC10-000-502N
HK$122.29
單位
5 kΩ Rotary 1 - Through Hole 1/8W 3 mm Linear - - Pin ±20% - -
RS庫存編號 167-3603
製造零件編號3540S-1-503L
BrandBourns
HK$172.17
Each (In a Tray of 25)
單位
50 kΩ Rotary 10 1 Panel Mount 2W 6.35 mm Linear - Wirewound Solder Lug ±5% 3540 20.6mm
RS庫存編號 167-3618
製造零件編號53RBA-R25-A15/A15L
BrandBourns
HK$125.265
Each (In a Tray of 45)
單位
10 kΩ Rotary 1 1 Panel Mount 1W 6 mm Linear - Cermet Solder Lug ±10% 53 25mm
RS庫存編號 168-0031
製造零件編號P13SMNFGS103MA
BrandVishay
HK$536.276
個 (以毎盒:10)
單位
10 kΩ Rotary 1 1 Panel Mount 1.5W 6 mm Linear - Cermet - ±20% P13SM 16mm
RS庫存編號 162-2384
製造零件編號157B103MX9001
BrandVishay
HK$219.556
個 (以毎盒:10)
單位
10 kΩ Rotary 1 1 Panel Mount 1W 6.35 mm Linear - Conductive Plastic Turret ±20% 157 22.2mm
RS庫存編號 167-8865
製造零件編號P11S1V0FLSY00104KA
BrandVishay
HK$68.80
個 (以毎盒:60)
單位
100 kΩ Rotary 1 1 Panel Mount 1W 6 mm Linear - Cermet Solder Lug ±10% P11S 25mm
RS庫存編號 172-7723
製造零件編號RK27112A00CF
HK$122.414
個 (以毎盒:500)
單位
50 kΩ Rotary 1 - Panel Mount, Through Hole 0.05W 6 mm Logarithmic - - Pin ±20% RK27 -
RS庫存編號 167-9502
製造零件編號534B1502JLB
BrandVishay
HK$146.73
個 (以毎盒:10)
單位
5 kΩ Rotary 10 1 Panel Mount 2W 6.35 mm Linear - Wirewound Solder Lug ±5% 534 20.6mm
RS庫存編號 167-8768
製造零件編號P13LFL103MAB10
BrandVishay
HK$179.72
個 (以毎盒:30)
單位
10 kΩ Rotary 1 1 Panel Mount 1.5W 6 mm Linear - Cermet Solder Lug ±20% P13 25mm
RS庫存編號 263-3163
製造零件編號RK11K1120ABW
HK$20.94
單位
10 kΩ Rotary 1 - Panel Mount, Through Hole 0.05W 6 mm Logarithmic - - Pin ±20% RK11K -