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 294-3741
製造零件編號860B1202
BrandVishay
HK$1,341.65
單位
2 kΩ Rotary 10 1 Panel Mount 8W 6.35 mm Linear - Wirewound Solder Lug ±1% 860 20.6mm
RS庫存編號 167-5484
製造零件編號PDB183-GTR01-504A2
BrandBourns
HK$30.21
個 (以毎袋:100)
單位
500 kΩ Rotary - 1 Panel Mount 0.1W 6 mm Audio - Carbon Solder Lug ±20% PDB183-GTR 19mm
RS庫存編號 249-9294
製造零件編號RK1631210AY7
HK$36.61
單位
10 kΩ Rotary 1 - Panel Mount, Through Hole 0.1W 6 mm Linear - - Pin ±20% RK163 -
RS庫存編號 168-0003
製造零件編號981HE0B4WA8H01
BrandVishay
HK$532.169
個 (以毎盒:10)
單位
- Rotary - - Panel Mount - 6.35 mm - - - - - 981 HE -
RS庫存編號 729-3653
製造零件編號RK09D1130A1N
HK$6.29
單位
10 kΩ Rotary 1 1 Through Hole 0.05W 6 mm Linear - - Pin ±20% RK09D 30mm
RS庫存編號 789-9383
製造零件編號3543S-1-502L
BrandBourns
HK$365.29
單位
5 kΩ Rotary 1 1 Panel Mount 1W 6.35 mm Linear - Wirewound Solder Lug ±5% 3543 20.6mm
RS庫存編號 692-8608
製造零件編號6539S-1-502
BrandBourns
HK$325.70
單位
5 kΩ Rotary 1 1 Panel Mount 1W 3.18 mm Linear - Conductive Plastic Solder Turret ±15% 6539 12.7mm
RS庫存編號 626-8410
製造零件編號3590S-2-104L
BrandBourns
HK$54.64
單位
- - - - - - - - - - - - 3590S -
RS庫存編號 831-8810
製造零件編號53C3500K
BrandHoneywell
HK$161.85
單位
500 kΩ Rotary - 1 Panel Mount 2W 6.35 mm Linear - Conductive Plastic Solder Lug ±10% 53C 22.2mm
RS庫存編號 249-9418
製造零件編號RS6011Y1401A
HK$38.30
單位
50 kΩ Slide 1 - Through Hole 0.2W - Linear - - Pin ±20% RS60 -
RS庫存編號 842-7059
BrandRS PRO
HK$43.86
單位
25 kΩ Rotary 1 1 Panel Mount 1W 6 mm Linear - Wirewound Solder ±10% P25 25mm
RS庫存編號 135-4480
製造零件編號1624202-2
HK$38.59
個 (以毎盒:100)
單位
10 kΩ Rotary 1 1 Panel Mount 0.4W 6.35 mm Linear - Carbon Solder Lug ±20% 23 50mm
RS庫存編號 167-8697
製造零件編號PE30L0FL103KLB
BrandVishay
HK$181.53
個 (以毎盒:10)
單位
10 kΩ Rotary 1 1 Panel Mount 1.5W 6 mm Logarithmic - Cermet Solder Lug ±10% PE30 25mm
RS庫存編號 522-5068
製造零件編號53RAA-R25-A13L
BrandBourns
HK$73.68
單位
5 kΩ Rotary 1 1 Panel Mount 1W 6 mm Linear - Cermet Solder Lug ±10% 53 25mm
RS庫存編號 173-0745
BrandRS PRO
HK$38.52
個 (以毎盒:50)
單位
25 kΩ - 1 - Panel Mount 1W 6 mm - - Wirewound Solder ±10% P25 25mm
RS庫存編號 167-3589
製造零件編號3590S-2-104L
BrandBourns
HK$128.70
Each (In a Tray of 25)
單位
100 kΩ Rotary 10 1 Panel Mount 2W 6.35 mm Linear - Wirewound Solder Lug ±5% 3590 20.6mm
RS庫存編號 172-8116
製造零件編號RK1631210AY7
HK$23.996
個 (以毎盒:2400)
單位
10 kΩ Rotary 1 - Panel Mount, Through Hole 0.1W 6 mm Linear - - Pin ±20% RK163 -
RS庫存編號 167-3615
製造零件編號53RAA-R25-A13L
BrandBourns
HK$61.70
Each (In a Tray of 45)
單位
5 kΩ Rotary 1 1 Panel Mount 1W 6 mm Linear - Cermet Solder Lug ±10% 53 25mm
RS庫存編號 790-4268
製造零件編號P13LFL106MAB10
BrandVishay
HK$179.72
單位
10 MΩ Rotary 1 1 Panel Mount 0.012W 6 mm Linear - Cermet Solder Lug ±20% P13 25mm
RS庫存編號 172-7566
製造零件編號RK09D1130A1N
HK$4.41
個 (以毎盒:1000)
單位
10 kΩ Rotary 1 - Through Hole 0.05W 6 mm Linear - - Pin ±20% RK09D -