Capacitors Blog

Round Trimming Potentiometers Features

(Single Turn/ Cermet/ Industrial)
(2 Terminal S tyles)

Round Trimming Potentiometers Electrical Characteristics

Standard Resistance Range 10Ω - 2MΩ
Resistance Tolerance ±30% std
Absolute Minimum Resistance 1% max (≤2K=30Ω)
Contact Resistance Variation 3% max
Resistance Essentially infinite
Adjustment Angle 235° nom

Round Trimming Potentiometers Contact

Fax #: 852 8208 6246
Email : info@suntan.com.hk

Suntan Technology Company Limited
----All Kinds of Capacitors

Trimming Potentiometers is used by more and more products, its application including satellite receivers, modems, LCD displays, set-top boxes, and meters and instruments, as well as entertainment devices, such as cameras, and MP3 players...

We can accept very small quantity with very competetive price , the delivery time is 2 weeks around. With our good support , our sales is keep increasing each month.

Suntan can offer all kinds of Trimming Potentiometers, as below:

TSR-3006 - Rectangular Trimming Potentiometers
TSR-3323 - 7 Terminal Square Trimming Potentiometers
TSR-3296 - 5 Terminal Square Trimming Potentiometers
TSR-3362 - 9 Terminal Square Trimming Potentiometers
TSR-3386 - 8 Terminal Square Trimming Potentiometers
TSR-3329 - Circularity Trimming Potentiometers
TSR-3266 - 5 Terminal Square Trimming Potentiometers
TSR-3318 - 6mm Phenolic Round Trimming Potentiometers
TSR-3306 - 6mm Cermet Round Trimming Potentiometers
TSR-3309 - 9mm Round Trimming Potentiometers
TSR-065 - Phenolic Trimming Potentiometers
TSR-3590 - Precision Multiturn Wirewoud Potentiometer
TSR-105H - 6 Terminal Trimming Potentiometers

A Potentiometer with a power rating of (say) 0.5W will have a maximum voltage that can exist across the pot before the rating is exceeded.

All power ratings are with the entire resistance element in circuit, so maximum dissipation reduces as the resistance is reduced (assuming series or "two terminal" rheostat wiring).

Let's look at the 0.5W pot, and 10k is a good value to start with for explanation.
If the maximum dissipation is 0.5W and the resistance is 10k, then the maximum current that may flow through the entire resistance element is determined by ...

P = I² R ... therefore
I =P / R ... so I = 7mA

In fact, 7mA is the maximum current that can flow in any part of the resistance element, so if the 10k pot were set to a resistance of 1k, current is still 7mA, and maximum power is now only 50mW, and not the 500mW we had before.

A potentiometer is an adjustable resistor. This is why some customers called potentiometer variable resistor. Resistor include fixed resistor and variable resistor. Variable resister (potentiometer) belongs to passive components. A potentiometer is constructed using resistive element comprising an arc of a circle and a sliding contact (wiper) travelling over that arc.

Trimmers come in a variety of sizes and levels of precision; for example, multi-turn trim potentiometers exist, in which it takes several turns of the adjustment screw to reach the end value, allowing for very high degrees of accuracy. Our Suntan has many types of Trimming Potentiometers ,for example TSR-3006  TSR-C3305 and so on ,these products is for our Suntan mark ,you can set your heart at rest ,we can guarantee our quality . f you have any questions please contact us, we can try our best to meet your requirements. For our website: www.suntan.com.hk  .You can find your best answer.

The reliability of a potentiometer depends on its ability to continue performing its intended function. Since the primary function is to provide a continuous and proportional voltage output, the primary reliability considerations are continuity and proportional voltage output. A failure in continuity is always catastrophic, as the device is no longer acting as a potentiometer.

The primary constituents of continuity are:

• Wiper contact to conductive surface
• Continuous conductive surface
• Wiper (output) and excitation terminal continuity

In analog computers, high precision potentiometers are used to scale intermediate results by desired constant factors, or to set initial conditions for a calculation. A motor-driven potentiometer may be used as a function generator, using a non-linear resistance card to supply approximations to trigonometric functions. For example, the shaft rotation might represent an angle, and the voltage division ratio can be made proportional to the cosine of the angle.

Suntan Technology Company Limited
----All Kinds of Capacitors

Potentiometers can be obtained with either linear or logarithmic laws (or "tapers").

Linear taper potentiometer

A linear taper potentiometer (Below Figure)has a resistive element of constant cross-section, resulting in a device where the resistance between the contact (wiper) and one end terminal is proportional to the distance between them. Linear taper describes the electrical characteristic of the device, not the geometry of the resistive element. Linear taper potentiometers are used when an approximately proportional relation is desired between shaft rotation and the division ratio of the potentiometer; for example, controls used for adjusting the centering of (an analog) cathode-ray oscilloscope.

Logarithmic potentiometer

A logarithmic taper potentiometer (Below Figure)has a resistive element that either 'tapers' in from one end to the other, or is made from a material whose resistively varies from one end to the other. This results in a device where output voltage is a logarithmic (or inverse logarithmic depending on type) function of the mechanical angle of the pot.

Logarithmic taper potentiometers are often used in connection with audio amplifiers. The most common use of a pot in audio is as a volume control. Since our hearing has a logarithmic response to sound pressure, it is important that the volume control should provide a smooth variation from soft to loud, such that a given change in position of the pot causes the same sensation of volume change at all levels.

In the early days, when an audio taper (logarithmic, or just log) was needed, the resistance element was indeed tapered, so that it provided a different resistively at different settings. By changing the physical taper, it was possible to make a pot provide the exact gradient of resistance needed. By definition, a linear pot has no taper as such (the resistance element is parallel sided), but the term has stuck, so we might as well get used to it.

The violet curve in Figure shows an antilog or reverse audio taper pot. These are quite uncommon, but used to be used for balance controls using a log/antilog dual section (commonly called dual gang) pot. It is shown on the graph mainly for its interest value, but they are generally an historical component now.

Suntan Technology Company Limited
----All Kinds of Capacitors

Trimming Potentiometers also come in many different shapes and sizes, with wattage ranging from 0.1W to 0.5W. Below shows several different trim pots, along with the symbol.

Resistance adjustments are made via a screwdriver. Exception is the trim pot on the lower right, which can be adjusted via a plastic shaft. Particularly fine adjusting can be achieved with the trim pot in the plastic rectangular casing (lower middle). Its slider is moved via a screw, so that several full turns is required to move the slider from one end to the other.

The upper model represents a stereo potentiometer. These are actually two pots in one casing, with sliders mounted on shared axis, so they move simultaneously. These are used in stereophonic amps for simultaneous regulation of both left and right channels, etc.

Lower left is the so called slider potentiometer.

Lower right is a wire-wound pot with a wattage of 20W, commonly used as rheostat (for regulating current while charging a battery etc).

For circuits that demand very accurate voltage and current values, trimmer potentiometers (or just trim pots) are used. These are small potentiometers with a slider that is adjusted via a screwdriver.