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 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 831-8781
製造零件編號53C31MEG
BrandHoneywell
HK$148.04
單位
1 MΩ Rotary - 1 Panel Mount 2W 6.35 mm Linear - Conductive Plastic Solder Lug ±10% 53C 22.2mm
RS庫存編號 853-6800
製造零件編號53C25K
BrandHoneywell
HK$165.75
單位
5 kΩ Rotary 1 1 Surface Mount 2W 6.35 mm Linear - Conductive Plastic Solder Lug ±10% 53C 15.9mm
RS庫存編號 854-1669
製造零件編號53C33500
BrandHoneywell
HK$144.27
單位
3.5 kΩ Rotary 1 1 Surface Mount 2W 6.35 mm Linear - Conductive Plastic Solder Lug ±10% 53C 22.2mm
RS庫存編號 831-8778
製造零件編號53C315K
BrandHoneywell
HK$139.05
單位
15 kΩ Rotary - 1 Panel Mount 2W 6.35 mm Linear - Conductive Plastic Solder Lug ±10% 53C 22.2mm
RS庫存編號 831-0487
製造零件編號380C310K
BrandHoneywell
HK$216.75
單位
10 kΩ Rotary - 1 Panel Mount 2W 6.35 mm Linear - Conductive Plastic Solder Lug ±10% 380 22.2mm
RS庫存編號 831-8750
製造零件編號53C3100
BrandHoneywell
HK$158.72
單位
100 Ω Rotary - 1 Panel Mount 2W 6.35 mm Linear - Conductive Plastic Solder Lug ±10% 53C 22.2mm
RS庫存編號 831-6687
製造零件編號53C12500
BrandHoneywell
HK$167.31
單位
2.5 kΩ Rotary - 1 Panel Mount 2W 6.35 mm Linear - Conductive Plastic Solder Lug ±10% 53C 19.1mm
RS庫存編號 831-8716
製造零件編號53C15MEG
BrandHoneywell
HK$163.28
單位
5 MΩ Rotary - 1 Panel Mount 2W 6.35 mm Linear - Conductive Plastic Solder Lug ±20% 53C 19.1mm
RS庫存編號 831-6772
製造零件編號JA1N056S102UA
BrandHoneywell
HK$780.12
單位
1 kΩ Rotary 1 1 Panel Mount 2W 6.35 mm Linear - Carbon Solder ±10% J 22.2mm
RS庫存編號 831-6782
製造零件編號JA1N056S251UA
BrandHoneywell
HK$771.67
單位
250 Ω Rotary - 1 Panel Mount 2.25W 6.35 mm Linear - Carbon Solder Lug - J 22.2mm
RS庫存編號 831-8829
製造零件編號574SX1M48F103SD
BrandHoneywell
HK$138.97
單位
10 kΩ Rotary - 1 - 0.5W 6.35 mm Linear - Conductive Plastic PC with Bracket ±20% 574 19.1mm
RS庫存編號 831-6690
製造零件編號53C125K
BrandHoneywell
HK$147.44
單位
25 kΩ Rotary - 1 Panel Mount 2W 6.35 mm Linear - Conductive Plastic Solder Lug ±10% 53C 19.1mm
RS庫存編號 831-8762
製造零件編號53C310K
BrandHoneywell
HK$135.46
單位
10 kΩ Rotary - 1 Panel Mount 2W 6.35 mm Linear - Conductive Plastic Solder Lug ±10% 53C 22.2mm
RS庫存編號 831-0490
製造零件編號380C32500
BrandHoneywell
HK$217.93
單位
2.5 kΩ Rotary - 1 Panel Mount 2W 6.35 mm Linear - Conductive Plastic Solder Lug ±10% 380 22.2mm
RS庫存編號 831-6662
製造零件編號53C1100
BrandHoneywell
HK$150.43
單位
100 Ω Rotary - 1 Panel Mount 2W 6.35 mm Linear - Conductive Plastic Solder Lug ±10% 53C 19.1mm
RS庫存編號 831-6791
製造零件編號JA1N056S252UA
BrandHoneywell
HK$765.42
單位
2.5 kΩ Rotary 1 1 Panel Mount 2W 6.35 mm Linear - Carbon Solder ±10% J 22.2mm
RS庫存編號 831-0686
製造零件編號73JA1K
BrandHoneywell
HK$590.05
單位
1 kΩ Rotary 10 1 Panel Mount 2W 6.35 mm Linear - Wirewound Solder Lug ±5% 73 20.6mm
RS庫存編號 831-0431
製造零件編號380C110K
BrandHoneywell
HK$211.70
單位
10 kΩ Rotary - 1 Panel Mount 2W 6.35 mm Linear - Conductive Plastic Solder Lug - 380 50.8mm
RS庫存編號 831-8813
製造零件編號53C350K
BrandHoneywell
HK$173.19
單位
50 kΩ Rotary - 1 Panel Mount 2W 6.35 mm Linear - Conductive Plastic Solder Lug ±10% 53C 22.2mm