Classification of precision potentiometers and analysis of precautions for use

In life, you may have come into contact with various Electronic products, then you may not know some of its components, such as the precision potentiometer it may contain, then let Xiaobian lead you to learn about precision potentiometers . A precision potentiometer is a variable resistor that can adjust its own resistance value with high precision.

Classification of precision potentiometers

1. Precision potentiometer with switch, with switch device attached to the precision potentiometer. The switch is coaxial with the precision potentiometer. The movement and control methods of the switch are divided into two types: rotary type and push-pull type.

2. Solid precision potentiometer, which is made of quartz powder, graphite, carbon black, organic binder, etc., mixed and heated, pressed on the plastic substrate, and then heated and polymerized. Advantages: wide resistance design, good wear resistance, high resolution, high reliability, small size; Disadvantages: high noise, poor high temperature resistance. Solid precision potentiometers can be divided into logarithmic solid precision potentiometers, linear solid precision potentiometers and small solid precision potentiometers.

3. Metal film precision potentiometer, the resistor body is made of metal composite film, metal oxide film, metal alloy film, tantalum oxide film and other materials, which are deposited on the ceramic substrate by vacuum technology. Advantages: high resolution, lower sliding noise than carbon film precision potentiometers; Disadvantages: poor wear resistance, small resistance design.

4. Single-turn precision potentiometer and multi-turn precision potentiometer, the sliding arm of single-turn precision potentiometer can only rotate in the plane within 3600, and is generally used for volume control. Each time the shaft of a multi-turn precision potentiometer rotates, the contact point of the sliding arm changes only a small part of the resistance, and when the sliding arm moves from one extreme position to another extreme position, the shaft needs to change many times.

5. Wire-wound precision potentiometer, the resistance body is made of resistance wire wound on non-metallic plate or metal coated with insulating material. The advantages are: high precision, low noise, high power and good stability; the disadvantages are: poor high frequency characteristics. Wire-wound precision potentiometers are divided into straight-slip precision multi-turn wire-wound precision potentiometers, ordinary wire-wound precision potentiometers, precision multi-turn wire-wound precision potentiometers, ordinary multi-turn wire-wound precision potentiometers, and functional precision multi-turn wires.Precision potentiometer peripherals, etc.

6. The composition of carbon film precision potentiometer is a kind of precision potentiometer widely used at that time. The resistor body is made of quartz powder, carbon black, graphite, organic binder, etc., and is coated on bakelite or glass fiber board. Advantages: high resolution, wide resistance design; Disadvantages: large sliding noise, poor heat and humidity resistance. Carbon film precision potentiometers are divided into straight sliding carbon film precision potentiometers, ordinary carbon film precision potentiometers, small carbon film precision potentiometers with switches, dual-axis non-switch/switch precision potentiometers, stand-alone with switch/non-switch precision potentiometers , dual coaxial non-switch/with switch precision potentiometer, small precision composite carbon film precision potentiometer, push-pull switch composite carbon film precision potentiometer, precision multi-turn composite carbon film precision potentiometer, etc.

7. Double precision potentiometer and single precision potentiometer, double precision potentiometer usually install two precision potentiometers of the same specification on the same axis. When arranging the shaft, the sliding contacts of the two precision potentiometers change synchronously. There are also double precision potentiometers for asynchronous off-axis; a single precision potentiometer controls a group of precision potentiometers by an independent axis.

Features and applications of precision potentiometers

Precision potentiometer, also called precision adjustable potentiometer, is a variable resistor that can adjust its own resistance with higher precision. There are pointer type and non-pointer type, etc., and the adjustment circles are 5 circles, 10 circles, etc. The potentiometer has the same characteristics as the wire wound potentiometer, but also has the advantages of good linearity and fine adjustment. It can be widely used in the occasion of precise adjustment of resistance. The main parameters are resistance, tolerance and rated power. Widely used in volume control of speakers and receivers in electronic equipment.

Precautions for the use of precision potentiometers

1. When the precision potentiometer is placed and stored, it should not be squeezed and stored too tightly, so as not to cause the adjusting rod of the precision potentiometer to fall off. At the same time, attention should also be paid to its storage environment. It should not be stored in a place that is too humid, so as not to cause the internal components of the potentiometer to be damp.

2. In the use of the precision potentiometer, do not operate too hard relative to its adjustment strength, otherwise it may cause the adjustment rod of the precision potentiometer to be damaged or fall off. The adjustment of the potentiometer may cause the phenomenon of not closing or being stuck.

3. Do not mobilize the resistance value of the potentiometer casually, otherwise, the resistance value deviation will be too large in the use of the potentiometer, which will cause the circuit current to be too large and damage the potentiometer.

I believe that by reading the above content, everyone has a preliminary understanding of precision potentiometers, and I also hope that everyone can make a good summary in the learning process, so as to continuously improve their design level.