Several types of organic solid potentiometers

　　Organic solid potentiometer Organic solid potentiometer is a new type of potentiometer, which uses the method of heating plastic pressing to press organic resistance powder in the groove of the insulator. Compared with carbon film potentiometer, organic solid potentiometer has the advantages of good heat resistance, high power, high reliability and good wear resistance. However, the temperature coefficient is large, the dynamic noise is large, the moisture resistance performance is poor, the manufacturing process is complex, and the precision of the resistance value is poor. It is used to regulate voltage and current in miniaturized, highly reliable and highly wear-resistant electronic equipment and AC and DC circuits.

　　The names of ordinary carbon film potentiometers are messy, but there are three types: logarithmic, exponential, and linear (that is, linear). What do these three really mean? The following is the general explanation, this small information is also left after learning before the collection, after reading, I hope to make friends who are not very clear to understand more, so as to choose a more appropriate use:

　　When the potentiometer is rotating, its corresponding resistance value changes with the rotation Angle, and can be divided into X, Z, and D types according to the change law. Type X is the linear type said above, and its resistance changes linearly according to the rotation Angle (see the change curve diagram), this potentiometer is suitable for partial voltage regulation current, field frequency adjustment in television, etc.

　　Type Z is an exponential type, and its resistance changes exponentially according to the rotation Angle (see change curve chart). It is often used in the volume adjustment circuit, because the hearing characteristics of the human ear for sound are close to the logarithmic relationship (this logarithmic relationship refers to the attenuation decibel value change relation 20logX, not refers to the resistance change, pay attention to the following D potentiometer), when the volume from zero gradually becomes larger in the process, the human ear is the most sensitive to the volume change hearing, When the volume increases to a certain extent, the human ear gradually becomes dull. Therefore, the volume adjustment generally uses an exponential potentiometer to make the volume change sound smooth and comfortable.

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