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Potentiometer manufacturers teach you potentiometer selection ideas

Potentiometer is a commonly used in the circuit of electronic components, purchasing potentiometer friends in the selection of potentiometer often only look at the surface without a real in-depth understanding of the potentiometer, potentiometer selection, should be the first from the following aspects to consider: the type of potentiometer, select the change in the resistance characteristics of the potentiometer parameters, the structure of the requirements.

1. Select the type of potentiometer according to the use requirements

In the general requirements of the circuit is not high, or the use of better environmental conditions, should be the first choice of synthetic carbon film potentiometers. Synthetic carbon film potentiometers have high resolution, wide range of resistance, variety of models, cheap features, but there are poor moisture resistance and poor stability shortcomings, can be widely used in indoor work on household appliances and equipment. For example, semiconductor radio with Switch volume potentiometers, can choose synthetic carbon film potentiometers; TV in the power adjustment circuit can choose straight slip carbon film potentiometers; other household appliances in the high load and fine-tuning potentiometers can also choose synthetic carbon film potentiometers. In addition, synthetic carbon film potentiometers have a long mechanical life, can be used in the requirements of long wear life of the circuit.

If the circuit needs to be adjusted precisely and consumes more power, wire-wound potentiometers should be used. Wire-wound potentiometers are only suitable for low-frequency circuits due to their large distribution parameters, so it is not advisable to use wire-wound potentiometers in high-frequency circuits. In addition, wire-wound potentiometer noise is small, the requirements of low noise circuit can be selected from this type of potentiometer.

Metal vitreous enamel potentiometer resistance range is wide, high reliability, high-frequency characteristics, temperature, humidity resistance is good, is a higher frequency circuit and precision electronic equipment preferred potentiometer type. In addition, metal glass glaze trimmer potentiometer can be used in small electronic equipment.

2. should be selected according to the use of resistance change characteristics

Potentiometer resistance change characteristics, should be selected according to the use. For example, the volume control potentiometer should be preferred index type potentiometer, in the absence of index type potentiometer can be used instead of linear potentiometer, but can not choose the logarithmic potentiometer, otherwise it will make the volume adjustment range becomes smaller; for the voltage divider potentiometer should be selected with a straight line potentiometer; for the pitch control potentiometer should be selected with a logarithmic potentiometer.

3. According to the requirements of the circuit to choose the parameters of the potentiometer

Potentiometer parameters are mainly nominal resistance, rated power, maximum operating voltage, linear accuracy and mechanical life, they are the basis for the selection of potentiometer. When the type of potentiometer is selected according to the requirements of use, the technical and performance parameters of the potentiometer should be selected according to the requirements of the circuit.

Different potentiometer mechanical life is not the same, generally synthetic carbon film potentiometer mechanical life is the longest, can be as high as 200,000 weeks, and vitreous enamel potentiometer mechanical life is only 100-200 weeks. Selection of potentiometers, should be based on the different requirements of the circuit on wear resistance, the selection of different mechanical life parameters of the potentiometer.

4. Pay attention to the structure of the requirements

Selection of potentiometers, pay attention to the size of the potentiometer size, the length of the shaft handle and shaft end style, as well as the position of the shaft whether the need to lock the switch, a single or multiple, single or multi-turn, etc., on the structure of the specific requirements.

For potentiometers that require frequent adjustment, select potentiometers with the shaft end milled into a flat surface for mounting the knob. For potentiometers that do not need to be adjusted frequently, choose potentiometers with grooves at the shaft end so that they will not rotate after adjustment with a screwdriver to maintain the relative stability of the working condition. For the requirement of accurate and once adjusted no longer change the potentiometer, should choose the potentiometer with locking device.

Potentiometer with switch, the switch part of the circuit power supply for on-off control, while the potentiometer part of the power for the adjustment. Switch potentiometer with switch switch form of single-knife single-throw, single-knife double-throw and double-knife double-throw, etc., the choice should be based on the need to determine. Potentiometer with switch is divided into push-pull switch potentiometer and rotary switch potentiometer two kinds. Push-pull switch potentiometer in the switching action, its moving contacts do not participate in the action, the advantage of doing so is: one to the resistor body without wear, and will not change the position of the installed potentiometer. Rotary potentiometer switch every action, the moving contacts to slide in the resistor body once, so wear and tear, will affect the service life of the potentiometer.

Single potentiometers are used for the adjustment of a single volume, and double potentiometers should be selected for the adjustment of the volume and pitch of the two channels in recorders, CD players and other stereo audio equipment.

In precision electronic equipment, automatic control devices and computer servo control circuits, should all use multi-turn potentiometer.

In the design of electronic equipment, in order to beautify the layout of the whole panel or save the area occupied by the potentiometer on the panel, generally should be used straight slide potentiometer.

KKG is 27 years old potentiometer manufacturers, specialising in the production of various types of potentiometers: rotary potentiometers, straight slip potentiometers, rocker potentiometers, potentiometers with switches, potentiometers with motors, etc., potentiometer models and specifications of the full range of perfect replacements for domestic and foreign brands of potentiometers. Years old potentiometer manufacturers can be customised according to the customer's shaft type, shaft length and working part length, bushing type, bushing length, full resistance value and its error value linearity. Find potentiometers manufacturers to find KKG.