There are many kinds of potentiometers. When choosing potentiometers, we should consider its structure, use and parameters. The following chapters introduce the precautions for choosing potentiometers in detail. The specific contents are as follows:

1. Pay attention to structural requirements
When choosing 3386 potentiometer, we should pay attention to the size of potentiometer, the length of shaft shank and the style of shaft end, and whether the position of axis needs locking switch, single or multiple, single or multiple loops, etc. to make specific demands on the structure.
For 3386 potentiometer that need to be adjusted regularly, a potentiometer milling the axle end into a plane should be selected to install the knob. For potentiometers that do not need constant adjustment, the bourns 3296 potentiometer with grooves at the axle end can be selected so that the potentiometer can not rotate after adjustment with screwdriver, so as to maintain the relative stability of the working state. Potentiometers with locking devices should be selected for potentiometers requiring accuracy and no change after adjustment.

2. Change characteristics of resistance value according to use
The resistance variation characteristics of bourns 3296 potentiometers should be selected according to their uses. For example, the exponential potentiometer should be the first choice for volume control potentiometers, but linear potentiometers can be used instead of exponential potentiometers in the absence of exponential potentiometers, but logarithmic potentiometers can not be used, otherwise the vocabulary range will be reduced: linear potentiometers should be used for voltage dividing; potentiometers for voice control should be selected. Logarithmic potentiometer.

3. Select the type of potentiometer according to the requirement of use
In general, the synthetic carbon film potentiometer should be chosen first in the circuit with low requirements or in the occasion with good use environment. The synthetic carbon film potentiometer has the characteristics of high resolution, wide resistance range, complete variety and low price, but it has the shortcomings of poor moisture resistance and stability. It can be widely used in household appliances working indoors. For example, the switched volume potentiometer used in semiconductor radio can choose synthetic carbon film potentiometer; the direct sliding carbon film potentiometer can be used in the power regulating circuit of TV; and the high load and fine-tuning potentiometer in other household appliances can also choose synthetic carbon film potentiometer. In addition, the synthetic carbon film potentiometer has a long mechanical life and can be used in circuits requiring a long wear-resistant life.
If the circuit needs to be adjusted precisely and consumes more power, the wire wound potentiometer should be selected. Wire-wound potentiometer is only suitable for low-frequency circuit because of its large distribution parameters, so it is not suitable to choose wire-wound potentiometer in high-frequency circuit. In addition, the noise of wire-wound potentiometer is low, so this kind of potentiometer can be used for circuits requiring low noise.

4. Selection of potentiometer parameters according to circuit requirements
The parameters of 3386 potentiometer mainly include nominal resistance, rated power, maximum operating voltage, linear accuracy and mechanical life, which are the basis for selecting potentiometer. When the type of rape potentiometer is selected according to the use requirements, the technical and performance parameters of the bourns 3296 potentiometer should be selected according to the requirements of the circuit.
Different potentiometers have different mechanical life. Generally, synthetic carbon film potentiometers have the longest mechanical life, up to 200,000 weeks, while glazed potentiometers have only 100-200 weeks. When selecting potentiometers, potentiometers with different mechanical life parameters should be selected according to different requirements of wear resistance of circuits.