P2026080543
Potentiometer with ON/OFF Switch - 100k
DZD 100.00
Potentiometers
78 results
Rotary potentiometers, adjustable trimmers and rheostats from 100 Ω to 500 kΩ, for setting a volume, a threshold, a speed or the output of a power supply.
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78 results
179 available
P2026080542
50k Potentiometer
DZD 65.00
P2026080540
Dual Potentiometer 100k
DZD 100.00
P2026080539
Dual Potentiometer 50k
DZD 100.00
DZD 200.00
DZD 250.00
DZD 450.00
Offer
P2026060107
Trimmer Potentiometer 10K
DZD 10.00
DZD 20.00
P2026060105
Mini Vertical Trimmer 20K WH188A
DZD 20.00
P2026060104
Mini Vertical Trimmer 2K WH188A
DZD 20.00
P2026060103
220R Single-Turn Horizontal Trimmer
DZD 30.00
P2026060102
7K5 Single-Turn Horizontal Trimmer
DZD 25.00
DZD 30.00
DZD 30.00
DZD 250.00
DZD 250.00
Choosing the right potentiometer
A potentiometer is a variable resistor with three pins: the two outer ones give the total value, the wiper gives an adjustable fraction. Wired this way, it forms a voltage divider; using only two pins, it becomes a simple variable resistor.
Three questions are usually enough: where the adjustment is made, what value, what power.
- Adjustment by the user: a 270° rotary with a shaft, such as the WH148-1A-2 (from B1K to B500K) or the horizontal PCB models Alps RK097N and PTV09A. For a stereo channel or two simultaneous adjustments, choose a dual potentiometer.
- Internal adjustment, set once: see the adjustable and trimmer range. A 3296W multiturn or a Bourns 3590S 10-turn allows fine calibration; a 3362 or 3319P single-turn is enough for a coarse adjustment.
- Power dissipation: trimmers can handle a few tenths of a watt. Beyond that, look at the power models or the wirewound rheostats, designed for current.
Also check the taper (B = linear, A = logarithmic for audio), the shaft diameter and the tolerance, often ±10% to ±20% on a trimmer. The rest of the components complete the build.
Frequently asked questions
What is the difference between a potentiometer and a rheostat?
The potentiometer is used with its three pins as a voltage divider, to deliver an adjustable voltage. The rheostat only uses two pins and is used to limit a current; it is generally wirewound and sized in watts.
What does the B in B10K mean?
The B indicates a linear taper: the resistance varies proportionally to the rotation angle. The A taper is logarithmic and is reserved for volume control, because the ear perceives sound logarithmically.
What value should be chosen for an Arduino analog input?
A value of 10 kΩ is suitable in most cases: low enough for the converter to read a stable voltage, high enough to limit current draw. Above 100 kΩ, the reading becomes sensitive to noise.
Why choose a multiturn like the 3296 over a single-turn?
The multiturn requires about ten turns of the screw to cover the full range, which makes the adjustment much finer and more stable. It is chosen to calibrate a threshold, an offset or a voltage reference.
What makes the price of a potentiometer vary?
The technology (carbon, cermet, wirewound), the precision and tolerance, the power rating, the number of turns and the manufacturer. A standard carbon trimmer and a precision wirewound potentiometer are not in the same range.