Precautions for the replacement and use of power amplifier audio potentiometers

Which potentiometer is more suitable for power amplifiers?

Potentiometers can be divided into three types: exponential, logarithmic, and linear based on the relationship between resistance and rotation angle. The characteristic of the exponential potentiometer is that the resistance change rate is small in the early stage and large in the later stage. Logarithmic potentiometers are the opposite. The linear potentiometer is the resistance change rate is proportional to the rotation angle.

The human ear has a characteristic. When the volume is low, the ear can detect a slight change in the volume, but at a high volume, even if the volume changes greatly, the ear can't detect it. That is to say, the ears are very sensitive to the volume when the volume is low, and dull when the volume is high. Based on this principle, the exponential type is most suitable for the audio volume potentiometer. In this way, when adjusting the volume, regardless of the volume position, the adjuster can feel that the rate of change of the volume is proportional to the angle of rotation. If other types are used, the adjuster will feel that the volume change is not proportional to the adjustment angle. , That's all, it will never have any impact on the electrical performance of the machine. What affects the electrical performance is the total resistance. However, there is a special volume potentiometer, that is, a four-pin potentiometer with a middle tap. Because the tap is used for equal-ring control, if the wrong type is used, the parameters of the equal-ring circuit will be affected. In this regard, There will be a certain impact on the sound quality.

Precautions for replacement of amplifier audio potentiometer

If it is a three-pin potentiometer, the three types can be interchanged, especially the linear type can be called "universal", even if it is used wrong, it will not have any adverse effects, but it feels "unused" when adjusting. If it is a four-pin potentiometer, it can still be interchanged in actual operation, because the adverse effect of the equivalent sound is not large. The problem of "the maximum volume has been reduced" will not occur.

Precautions for the use of power amplifier audio potentiometer

1. Do not use too much force on the adjustment of the power amplifier audio potentiometer, if it is too large, it will cause the potentiometer to be turned off and so on.

2. During the use of the power amplifier, be careful not to operate the volume adjustment with wet hands, so as not to cause accidents such as electric shock on the one hand, and on the other hand, if there is water droplets inside the potentiometer, it will cause the potentiometer to cause a short circuit failure. And other issues.

3. When installing the power amplifier audio potentiometer, make sure that the potentiometer is firmly installed, otherwise the use of the potentiometer will cause some problems such as poor contact.

4. Regarding the wiring of the audio potentiometer of the power amplifier, be careful not to make mistakes. Otherwise, once the power is turned on, the current between the lines is incompatible, which may easily lead to damage to the potentiometer.