Technical parameters for potentiometer selection, a must-see2021

There are many types, structures, installation methods and technical parameters of potentiometers. When choosing a potentiometer, circuit designers should first determine the performance indicators according to the function of the potentiometer in the circuit. The following are the first technical indicators to consider when selecting a potentiometer. , Everyone can pay attention to it.

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1. Rated power. The maximum power allowed to be dissipated on the two fixed ends of the potentiometer is the rated power of the potentiometer. It should be noted that the rated power is not equal to the power of the center tap and the fixed end.

2. Nominal resistance. The series of the nominal resistance value marked on the product is similar to the series of resistance.

3. Allowable error level. The error range between the measured resistance and the nominal resistance can allow ±20%, ±10%, ±5%, ±2%, ±1% errors according to different accuracy levels. The precision of the precision potentiometer can reach ±0.1%.

4. The law of resistance change. Refers to the relationship between the resistance value and the rotation angle (or sliding stroke) of the sliding contact. This relationship can be in any functional form. Commonly used are linear, logarithmic and reverse logarithmic (exponential). In use, linear potentiometers are suitable for voltage dividers; inverted logarithmic (exponential) potentiometers are suitable for volume controllers in radios, tape recorders, record players, and televisions. If you cannot find similar products during maintenance, you can use linear instead of logarithmic instead. Logarithmic potentiometers are only suitable for tone control, etc.