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Definition of Potentiometer

The information comes from:the Internet posted on:2023-06-27

definition
Potentiometer is a kind of variable resistor. Usually composed of a resistive body and a rotating or sliding system, that is, by moving a moving contact on the resistive body, a partial voltage output is obtained.
The function of Potentiometer is to adjust the voltage (including DC voltage and signal voltage) and current.
The structural feature of Potentiometer - the resistance body of Potentiometer has two fixed ends. By manually adjusting the rotating shaft or sliding handle, changing the position of the moving contact on the resistance body changes the resistance value between the moving contact and any fixed end, thus changing the voltage and current.
Potentiometer is an adjustable electronic component. It is composed of a resistor and a rotating or sliding system. When a voltage is applied between the two fixed contacts of a resistor, the position of the contacts on the resistor can be changed by rotating or sliding the system, and a voltage that is related to the position of the moving contact can be obtained between the moving contact and the fixed contact. It is mostly used as a voltage divider. At this time, the Potentiometer is a four terminal element. Potentiometer is basically a sliding rheostat, which has several styles. It is generally used to adjust the volume switch of the speaker and the power of the laser head. Potentiometer is an adjustable electronic component.
A variable resistor used for voltage division. On the exposed resistor, one to two movable metal contacts are tightly pressed. The contact position determines the resistance value between either end of the resistor and the contact. Wire winding, carbon film, solid core Potentiometer according to material; According to the relationship between the output and input voltage ratio and the rotation angle, there are linear Potentiometer and function Potentiometer. The main parameters are resistance, tolerance, and rated power. Widely used in electronic devices for volume control in audio and receivers.
recognition
Further analysis of the right waveform and expansion according to the time axis shows that although the left and right waveforms of the pulse Potentiometer are the same. But when turning left, in the first state, foot 1 first becomes low-level compared to foot 2; In the second state, pin 2 also becomes low level; In the third state, pin 1 first becomes higher than pin 2; In the fourth state, pin 2 also becomes high; When the pulse Potentiometer rotates to the right, the change rule of the output waveform of foot 1 and foot 2 is just opposite to that of the left. Therefore, whether the pulse Potentiometer rotates left or right can be identified according to the time identification method (compare the time difference between the occurrence and end of P1.0 and P1.1 low level). In dynamic scanning, it is difficult to measure the waveforms of P1.0 and P1.1 due to factors such as sampling frequency and operating speed; It is also difficult to accurately measure the time difference between the appearance and end of low-level P1.0 and P1.1, and it is only possible to quickly sample the P1.0 and P1.1 levels. Correspondingly, the waveform shown in Figure 1 is unfolded along the time axis. Whenever the combined levels of P1.0 and P1.1 are 01 00 10 11, and four status codes form a byte called 4BH, it indicates that the left rotation volume decreases by 1 bit. Whenever the combined levels of P1.0 and P1.1 are 10 00 01 11, four status codes form a byte, which is 87H; It means turning one digit to the right and increasing the volume by 1. Here, "4BH" is referred to as a left-handed one bit feature code, and "87H" is referred to as a right-handed one bit feature code