How to choose a potentiometer2021

The potentiometer is a kind of precision electronic components, which is widely used in the circuits of various industries. However, there are thousands of potentiometers on the market. How to choose the right potentiometer? From a general perspective, it should be followed The following three points:

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The potentiometer needs to be selected according to the requirements of the circuit, such as some resistance materials, specifications, structure types and adjustment methods of the potentiometer.

(1) Choose a potentiometer that is suitable for choosing reasonable electrical parameters

After the equipment and circuit requirements are determined, the type and specifications of the positioner are selected, and the electrical parameters of the positioner should be reasonably selected according to the requirements of the circuit. The electrical parameters of the potentiometer mainly include rated power, nominal resistance, allowable deviation, Resolution, maximum operating voltage, dynamic noise, etc.

(2) Select the potentiometer by the law of resistance change

The voltage adjustment in different power circuits, the adjustment of the operating point of the amplifying circuit, and the potentiometer for auxiliary brightness adjustment should use linear potentiometers. The potentiometer used for sound control adjustment in audio equipment should use the inverted logarithmic potentiometer, but the logarithmic potentiometer can be used for the volume control potentiometer.

(3) Choose the potentiometer according to the actual use requirements

For example, some precision instruments and other circuits should use high-precision wirewound potentiometers and precision multi-turn potentiometers; medium and high-frequency circuits can use carbon film potentiometers; the volume adjustment and power switch of semiconductor radios can choose small rotary switches. Carbon film potentiometer; dual-axis potentiometer can be used for volume control of stereo audio amplifier; direct sliding potentiometer can be used for tone control of audio system; fine-tuning potentiometer should be used for reference voltage adjustment of power circuit; communication equipment and computer The potentiometer used can be a patch type multi-turn potentiometer or a single-turn potentiometer.