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 167-3582
製造零件編號3590S-2-102L
BrandBourns
HK$99.35
Each (In a Tray of 25)
單位
1 kΩ Rotary 10 1 Panel Mount 2W 6.35 mm Linear - Wirewound Solder Lug ±5% 3590 20.6mm
RS庫存編號 107-0757
製造零件編號3590S-2-102L
BrandBourns
HK$121.40
單位
1 kΩ Rotary 10 1 Panel Mount 2W 6.35 mm Linear - Wirewound Solder Lug ±5% 3590 20.6mm
RS庫存編號 692-8639
製造零件編號PDB241-GTR01-504A2
BrandBourns
HK$33.58
單位
500 kΩ Rotary 1 1 Panel Mount 0.25W 6 mm Audio - Carbon Solder Lug ±20% PDB241-GTR 19mm
RS庫存編號 167-4683
製造零件編號PDB241-GTR01-504A2
BrandBourns
HK$22.42
個 (以毎袋:100)
單位
500 kΩ Rotary 1 1 Panel Mount 0.25W 6 mm Audio - Carbon Solder Lug ±20% PDB241-GTR 19mm
RS庫存編號 737-7818
製造零件編號PTV09A-2015F-B103
BrandBourns
HK$6.33
單位
10 kΩ Rotary 1 1 Through Hole 0.05W 6 mm Linear - Carbon PC Pin ±20% PTV09 15mm
RS庫存編號 167-4692
製造零件編號PTV09A-2015F-B103
BrandBourns
HK$5.24
Each (In a Tray of 100)
單位
10 kΩ Rotary 1 1 Through Hole 0.05W 6 mm Linear - Carbon PC Pin ±20% PTV09 15mm
RS庫存編號 167-3603
製造零件編號3540S-1-503L
BrandBourns
HK$193.815
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 522-3034
製造零件編號3540S-1-503L
BrandBourns
HK$253.20
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 522-5131
製造零件編號53RBA-R25-A15/A15L
BrandBourns
HK$110.92
單位
10 kΩ Rotary 1 1 Panel Mount 1W 6 mm Linear - Cermet Solder Lug ±10% 53 25mm
RS庫存編號 167-3618
製造零件編號53RBA-R25-A15/A15L
BrandBourns
HK$100.823
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 522-5068
製造零件編號53RAA-R25-A13L
BrandBourns
HK$74.96
單位
5 kΩ Rotary 1 1 Panel Mount 1W 6 mm Linear - Cermet Solder Lug ±10% 53 25mm
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 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 167-5464
製造零件編號3543S-1-502L
BrandBourns
HK$271.992
Each (In a Tray of 25)
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 167-3515
製造零件編號3310Y-001-104L
BrandBourns
HK$18.509
毎管:50 個
單位
100 kΩ Rotary 1 1 Panel Mount, Through Hole 0.25W 3.18 mm Linear - Conductive Plastic PC Pin ±20% 3310 12.7mm
RS庫存編號 770-3078
製造零件編號PDB183-GTR01-504A2
BrandBourns
HK$43.90
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 522-3028
製造零件編號3540S-1-502L
BrandBourns
HK$234.18
單位
5 kΩ Rotary 10 1 Panel Mount 2W 6.35 mm Linear - Wirewound Solder Lug ±5% 3540 20.6mm
RS庫存編號 789-9383
製造零件編號3543S-1-502L
BrandBourns
HK$410.72
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 827-5035
製造零件編號PTD901-2015K-B103
BrandBourns
HK$14.81
單位
10 kΩ Rotary - 1 - 0.05W 6 mm Linear - Carbon PC Pin ±25% PTD90 15mm
RS庫存編號 107-0814
製造零件編號3590S-2-104L
BrandBourns
HK$156.07
單位
100 kΩ Rotary 10 1 Panel Mount 2W 6.35 mm Linear - Wirewound Solder Lug ±5% 3590 20.6mm