Thumbwheel Potentiometers (Thumbwheel Potentiometers) as a kind of precision electronic regulation device, its position in modern electronic technology can not be underestimated. It changes the resistance value in the circuit by rotating the dial wheel, so as to achieve accurate control of current or voltage. This kind of potentiometer usually consists of a rotating shaft and a fixed resistance element, one end of the shaft is connected to a contact arm, as the shaft rotates, the contact arm slides over the resistance element, changing the length of the resistance path, and thus adjusting the size of the resistance. In the circuit, the rotary potentiometer mainly plays the role of regulator, by changing the resistance value to affect the current distribution and voltage drop in the circuit, to achieve the fine tuning of the circuit parameters. This adjustment method is not only flexible and convenient, but also has high precision, and can meet the needs of a variety of complex circuits.

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