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Knowledge of the potentiometers with switches
Date:2018-11-14 Views:57
1. Working principle of potentiometer with switch

The rotary switch potentiometer has two fixed ends. By manually adjusting the rotating shaft or sliding handle to change the position of the moving contact on the resistor, the resistance value between the moving contact and any fixed end is changed, thus the magnitude of voltage and current is changed.

The rotary switch potentiometer is an adjustable electronic component. It consists of a resistor body and a rotating or sliding system. When a voltage is applied between the two fixed contacts of the resistor, the position of the contacts on the resistor is changed by rotating or sliding system, and a voltage related to the position of the moving contacts can be obtained between the moving contacts and the fixed contacts. It is mostly used as voltage divider, and the trimmer potentiometer is a four terminal element. The switched potentiometer is basically a sliding rheostat. There are several types of switched potentiometer. It is generally used in speaker volume switch and laser head power adjustment. The switched potentiometer is an adjustable electronic component.

2. Application fields of potentiometer with switch

Variable resistor for voltage divider. One or two movable metal contacts are tightly pressed on the bare resistor body. The contact position determines the resistance between any end of the resistor body and the contact point. According to material winding, carbon film, solid core trimmer potentiometer, linear switching potentiometer and functional switching potentiometer according to the relationship between output and input voltage ratio and rotation angle. The main parameters are resistance, tolerance and rated power. Widely used in electronic equipment, in the sound and receiver for volume control.

3. adjusting method of potentiometer with switch

In general, rotary switch potentiometer has positive and negative symmetrical power supply in the circuit. First, when the central contact C of the potentiometer slides to the potentiometer A terminal, the output voltage of OUT is + 12V. On the contrary, when the central contact C of the potentiometer slides to the potentiometer B terminal, the output voltage of OUT is - 12V. At this time, the C of the potentiometer can be adjusted within the range of 0- V. Therefore, the volume of the potentiometer's central contact C is the smallest when it slides to potentiometer B, and the volume of the potentiometer's central contact C is the largest when it slides to potentiometer A. Finally, when the trimmer potentiometer's central contact C reaches to potentiometer B, it will lead to poor contact and other phenomena, which will cause the regulated volume of the potentiometer can not be closed.