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1、 Structural characteristics of adjustable resistors:
(1) The external structure of an adjustable resistor is usually a thin and long cylindrical shape, about 1cm long and with a diameter of about 0.3cm. The volume size of adjustable resistors also varies. The larger the volume, the greater the power of the adjustable resistor. At the same power, the volume of metal film resistors is smaller than that of carbon film adjustable resistors.
(2) Adjustable resistors have only two pins, which do not have positive or negative polarity. The two pins of a common adjustable resistor extend along the axis direction and can be bent for installation on a circuit board.
2、 Selection criteria for adjustable resistors:
(1) Usually used in high gain amplification circuits, it is recommended to choose resistors with low noise electromotive force. For example, carbon film adjustable resistors and metal film adjustable resistors.
(2) The smaller the distribution parameters of resistors in high-frequency circuits, the better. However, in some high-frequency circuits up to several hundred megahertz, their wire wound resistance is far from compatible for operation. Therefore, metal oxide film resistors need to be selected, but in high-frequency circuits, high-frequency carbon film adjustable resistors should be used.
(3) When there are high requirements for the operating frequency of the circuit, it is recommended to use a wire wound adjustable resistor because its wire wound resistance distribution parameters are large and suitable for working in high-frequency circuits. However, in circuits below 50kHz, the distribution parameters of its resistance have little impact on the circuit operation, and it is recommended to use wire wound adjustable resistors.
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