Potentiometers

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.

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.


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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 Stock No. 162-776
Mfr. Part No.404802692032
HK$151.55
Each
units
100 Ω Rotary 1 1 Panel Mount 2W 6.35 mm Linear - Cermet Pin ±10% M 25.4mm
RS Stock No. 164-5242
Mfr. Part No.27ESA103MMF50NF
HK$26.02
Each (In a Box of 100)
units
10 kΩ Rotary 1 2 Panel Mount 0.4W 4 mm Linear - Carbon Solder ±20% 27 50mm
RS Stock No. 807-7171
Mfr. Part No.27ESA103MMF50NF
HK$32.54
Each
units
10 kΩ Rotary 1 2 Panel Mount 0.4W 4 mm Linear - Carbon Solder ±20% 27 50mm
RS Stock No. 136-1812
Mfr. Part No.TW1253KA
HK$61.10
Each (In a Box of 500)
units
25 kΩ Rotary 1 1 Panel Mount 1W 6.35 mm Linear - Wirewound Solder Lug ±10% TW 15mm
RS Stock No. 502-8643
Mfr. Part No.TW1253KA
HK$83.93
Each
units
25 kΩ Rotary 1 1 Panel Mount 1W 6.35 mm Linear - Wirewound Solder Lug ±10% TW 15mm
RS Stock No. 135-5049
Mfr. Part No.TW1103KA
HK$57.906
Each (In a Box of 500)
units
10 kΩ Rotary 1 1 Panel Mount 1W 6.35 mm Linear - Wirewound Solder Lug ±10% TW 15mm
RS Stock No. 387-739
Mfr. Part No.1624139-2
HK$23.03
Each
units
4.7 kΩ Rotary 1 1 Panel Mount 0.4W 6.35 mm Linear - Carbon Solder Lug ±20% 23 50mm
RS Stock No. 135-4477
Mfr. Part No.1624139-2
HK$22.269
Each (In a Box of 200)
units
4.7 kΩ Rotary 1 1 Panel Mount 0.4W 6.35 mm Linear - Carbon Solder Lug ±20% 23 50mm
RS Stock No. 161-5120
Mfr. Part No.27ESA103MMF50N
HK$28.167
Each (In a Box of 100)
units
10 kΩ Rotary 1 2 Panel Mount 0.4W 6.35 mm Linear - Carbon Solder Lug ±20% 27 50mm
RS Stock No. 168-140
Mfr. Part No.1623760-2
HK$31.45
Each
units
10 kΩ Rotary 1 1 Panel Mount 0.4W 6.35 mm Linear - Carbon Solder Lug ±20% 23 50mm
RS Stock No. 135-4432
Mfr. Part No.1623760-2
HK$27.97
Each (In a Box of 200)
units
10 kΩ Rotary 1 1 Panel Mount 0.4W 6.35 mm Linear - Carbon Solder Lug ±20% 23 50mm
RS Stock No. 168-364
Mfr. Part No.27ESA103MMF50N
HK$34.73
Each
units
10 kΩ Rotary 1 2 Panel Mount 0.4W 6.35 mm Linear - Carbon Solder Lug ±20% 27 50mm
RS Stock No. 502-8637
Mfr. Part No.TW1103KA
HK$80.24
Each
units
10 kΩ Rotary 1 1 Panel Mount 1W 6.35 mm Linear - Wirewound Solder Lug ±10% TW 15mm
RS Stock No. 135-4478
Mfr. Part No.1623757-2
HK$25.049
Each (In a Box of 200)
units
1 kΩ Rotary 1 1 Panel Mount 0.4W 6.35 mm Linear - Carbon Solder Lug ±20% 23 50mm
RS Stock No. 387-745
Mfr. Part No.1623757-2
HK$37.38
Each
units
1 kΩ Rotary 1 1 Panel Mount 0.4W 6.35 mm Linear - Carbon Solder Lug ±20% 23 50mm
RS Stock No. 162-883
Mfr. Part No.404802692030
HK$130.66
Each
units
470 kΩ Rotary 1 1 Panel Mount 2W 6.35 mm Linear - Cermet Pin ±10% M 25mm
RS Stock No. 168-320
Mfr. Part No.27ESB103MMF50N
HK$32.36
Each
units
10 kΩ Rotary 1 2 Panel Mount 0.2W 6.35 mm Logarithmic - Carbon Solder Lug ±20% 27 50mm
RS Stock No. 162-861
Mfr. Part No.404802692031
HK$148.19
Each
units
100 kΩ Rotary 1 1 Panel Mount 2W 6.35 mm Linear - Cermet Pin ±10% M 25.4mm
RS Stock No. 161-5122
Mfr. Part No.27ESB103MMF50N
HK$23.01
Each (In a Box of 100)
units
10 kΩ Rotary 1 2 Panel Mount 0.2W 6.35 mm Logarithmic - Carbon Solder Lug ±20% 27 50mm
RS Stock No. 893-7329
Mfr. Part No.SP2-50
HK$2,055.09
Each
units
10 kΩ Linear - - Bracket Mount 2W 4.19 mm Linear - Conductive Plastic Cable ±10% SP2 12.7mm