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The potentiometer is introduced in detail and its working principle

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The potentiometer is introduced in detail and its working principle

Date of release:2018-09-20 Author: Click:

A potentiometer is a variable resistor for partial voltage. One or two movable metal contacts are pressed tightly against the exposed resistance. The position of the contact determines the resistance between either end of the resistance body and the contact. Wire winding, carbon film, solid core potentiometer according to material; According to the output and input voltage ratio and rotation Angle of the relationship between linear potentiometer (a linear relationship), function potentiometer (a curve relationship). The main parameters are resistance, tolerance and rated power. Widely used in electronic equipment, instrumentation, audio and receiver for volume control.



When a voltage is applied between two fixed contacts of the resistance body, the position of the contact on the resistance body can be changed by rotating or sliding system, and a voltage which is related to the position of the moving contact can be obtained between the moving contact and the fixed contact.



It is mostly used as a voltage divider and this potentiometer is a three-terminal element. Potentiometers are basically sliding rheostats, available in several styles, commonly used in speaker volume switches and laser head power adjustments.




Potentiometer structure classification



Large structure can be divided into two categories: rotary potentiometer, straight - slip potentiometer


Ordinary potentiometer without switch: used for general potential adjustment.


Ordinary potentiometer with switch: used for radio, instrument, and other general household appliances


Micro-potentiometer/semi-variable potentiometer: used for internal regulating potential of electronic equipment, home appliances and instruments.


Straight slip potentiometer: this is a long strip of visual more intuitive. In the random sound listens, the sound system USES is quite common.


Multi-turn potentiometer/precision potentiometer: multi-turn internal wire wound, glass glaze and other materials made, generally more than 10 turns, mainly used in instruments, electronic equipment to do precision adjustment.


Dual potentiometer: it is a kind of potentiometer with two sets of resistance substrates to make synchronous adjustment, such as double channel sound, if you use two ordinary potentiometers to adjust the volume, it is a very troublesome thing, using the dual potentiometer to adjust the volume is very convenient.


Multiple potentiometer: it is also a kind of synchronous potentiometer, which can be made into any number of potentiometers. It is widely used in audio and electronic equipment to realize synchronous adjustment.


Sliding rheostat: it is a potentiometer commonly used in the laboratory. This potentiometer is large in size, high in power and can be used as a current limiter.


Wire-wound potentiometer: the resistance body of wire-wound potentiometer is composed of resistance wires wound on the insulation. There are many kinds of resistance wires: general wire-wound resistor, precision wire-wound resistor, high-power wire-wound resistor and high-frequency wire-wound resistor. The material of the resistance wire is based on the structure of the potentiometer, the space to hold the resistance wire, the resistance value and. Temperature coefficients. The thinner the resistance wire, the greater the resistance value and resolution within a given space. However, the resistance wire is too thin, easy to disconnect in the process of use, affecting the life of the sensor. Widely used in electronic equipment, welding machines, motors, and other occasions.



Usage of potentiometer:



The circuit has positive and negative symmetrical power supply. For example, when the center contact C of the potentiometer slides to the A end of the potentiometer, the OUT output voltage to the ground is +12V; when the center contact C of the potentiometer slides to the B end of the potentiometer, the OUT output voltage to the ground is -12v.


A potentiometer is an adjustable electronic element. It consists of a resistive body and a rotating or sliding system. When a voltage is applied between two fixed contacts of the resistance body, the position of the contact on the resistance body can be changed by rotating or sliding system, and a voltage which is related to the position of the moving contact can be obtained between the moving contact and the fixed contact.

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