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 602-3699
製造零件編號JC10-000-502N
HK$122.87
單位
5 kΩ Rotary 1 - Through Hole 1/8W 3 mm Linear - - Pin ±20% - -
RS庫存編號 475-6072
製造零件編號M-22E10-050 10K
HK$149.64
單位
10 kΩ Rotary 10 - Panel Mount 2W 6 mm Linear - - Solder Lug ±5% - -
RS庫存編號 475-6094
製造零件編號M-22E10-050 50K
HK$122.74
單位
50 kΩ Rotary 10 - Panel Mount 2W 6 mm Linear - - Solder Lug ±5% - -
RS庫存編號 475-6044
製造零件編號M-22E10-050 2K
HK$129.27
單位
2 kΩ Rotary 10 - Panel Mount 2W 6 mm Linear - - Solder Lug ±5% M-22E10 -
RS庫存編號 182-5657
製造零件編號M-1305 2K
HK$187.40
單位
2 kΩ Rotary 5 1 - 2W 3 mm Linear - Wirewound Solder ±5% M 10mm
RS庫存編號 182-5643
製造零件編號M-22S10 500
HK$184.23
單位
500 Ω Rotary 10 1 - 2W 6 mm Linear - Wirewound Solder ±5% M 15mm
RS庫存編號 182-5677
製造零件編號JP-30B 5K
HK$298.57
單位
5 kΩ Rotary 1 1 - 1.5W 6 mm Linear - Cermet Solder ±2% JP-30B 17mm
RS庫存編號 602-3756
製造零件編號MC1003-000-502
HK$321.37
單位
5 kΩ Rotary 3 - Panel Mount 19/100W 3 mm Linear - - Solder Lug ±20% - -
RS庫存編號 182-5653
製造零件編號M-22E10 20K
HK$139.76
單位
20 kΩ Rotary 10 1 - 2W 6 mm Linear - Wirewound Solder ±5% M 15mm
RS庫存編號 182-5649
製造零件編號M-22S10 100
HK$184.23
單位
100 Ω Rotary 10 1 - 2W 6 mm Linear - Wirewound Solder ±5% M 15mm
RS庫存編號 182-5644
製造零件編號M-22S10 2K
HK$184.23
單位
2 kΩ Rotary 10 1 - 2W 6 mm Linear - Wirewound Solder ±5% M 15mm
RS庫存編號 182-5679
製造零件編號JP-30B 1K
HK$298.57
單位
1 kΩ Rotary 1 1 - 1.5W 6 mm Linear - Cermet Solder ±2% JP-30B 17mm
RS庫存編號 475-6101
製造零件編號M-22E10-050 100K
HK$129.20
單位
100 kΩ Rotary 10 - Panel Mount 2W 6 mm Linear - - Solder Lug ±5% - -
RS庫存編號 475-6016
製造零件編號M-22E10-050 200
HK$141.08
單位
200 Ω Rotary 10 - Panel Mount 2W 6 mm Linear - - Solder Lug ±5% - -
RS庫存編號 182-5659
製造零件編號M-1305 20K
HK$187.40
單位
20 kΩ Rotary 5 1 - 2W 3 mm Linear - Wirewound Solder ±5% M 10mm
RS庫存編號 182-5650
製造零件編號M-22E10 5K
HK$139.76
單位
5 kΩ Rotary 10 1 - 2W 6 mm Linear - Wirewound Solder ±5% M 15mm
RS庫存編號 182-5665
製造零件編號M-1303 20K
HK$187.40
單位
20 kΩ Rotary 3 1 - 2W 3 mm Linear - Wirewound Solder ±5% M 10mm
RS庫存編號 182-5641
製造零件編號M-22S10 50K
HK$184.23
單位
50 kΩ Rotary 10 1 - 2W 6 mm Linear - Wirewound Solder ±5% M 15mm
RS庫存編號 182-5656
製造零件編號M-1305 5K
HK$187.40
單位
5 kΩ Rotary 5 1 - 2W 3 mm Linear - Wirewound Solder ±5% M 10mm
RS庫存編號 182-5648
製造零件編號M-22S10 10K
HK$184.23
單位
10 kΩ Rotary 10 1 - 2W 6 mm Linear - Wirewound Solder ±5% M 15mm