Structural features and selection instructions of adjustable resistors

Adjustable resistors are one of the most widely used electronic components. The commonly used specifications include ceramic adjustable resistor RM085G-V5, carbon film adjustable resistor RM065-V1, ceramic adjustable resistor RM065G-H3, carbon film adjustable resistor Adjustable resistor RM065-V5, ceramic adjustable resistor RM065G-V4, carbon film adjustable resistor RM085X-V1, ceramic adjustable resistor RM085G-H5, carbon film adjustable resistor RM085C-V1, etc. Adjustable resistors are classified according to materials, mainly ceramic adjustable resistors, carbon film adjustable resistors, precision adjustable resistors, etc. There are many specifications and models of adjustable resistors. It is recommended that you choose according to your actual needs and under the guidance of relevant technical personnel when purchasing!

　　 1. Structural characteristics of adjustable resistors:

(1) The shape and structure of the adjustable resistor is usually a slender and long cylindrical shape, about 1cm in length and 0.3cm in diameter. The volume of the adjustable resistor is also different. The larger the volume, the adjustable resistor The greater the power, the volume of the metal film resistor at the same power is smaller than the volume of the carbon film adjustable resistor.

(2) Color ring adjustable resistors are usually used more often. There are four color rings on the resistor, in addition to 3 and 5, these color rings are used to indicate the adjustable resistor Resistance size and error level. For non-color ring adjustable resistors, the resistance value and other parameters will be directly marked on the resistor.

(3) The adjustable resistor has only two pins. The two pins are not divided into positive and negative polarity. The two pins of common adjustable resistors extend along the axis and can be bent for installation on the circuit board. .

　　 Two. Selection instructions for adjustable resistors:

　　(1) Usually used in high gain amplifier circuits, it is recommended to use resistors with low noise electromotive force, such as carbon film adjustable resistors and metal film adjustable resistors.

　　 (2) Resistors in high frequency circuits require their distribution parameters to be as small as possible. However, if in some high-frequency circuits up to hundreds of MHz, the wire-wound resistance is far from compatible with operation, so you need to choose a metal oxide film resistor. But in UHF circuits, UHF carbon film adjustable resistors should be used.

　　(3) In the case of higher requirements for the operating frequency of the circuit, wire-wound adjustable resistors are recommended, because the wire-wound resistance has a large distribution parameter, which is suitable for working in high-frequency circuits. However, in the circuit below 50kHz, the distribution parameters of the resistance have little effect on the operation of the circuit. It is recommended to use a wire-wound adjustable resistor for the rear.

　　 Three, the meaning of the suffix letters of adjustable resistors:

　　 (1) The meaning of the prefix letters: conventional resistors are generally marked with corresponding letters before them, and the prefix letters are usually used to identify the product specifications. For example, the prefix R indicates a resistor, and W indicates a potentiometer.

(2) Description of the serial number: The serial number of the resistance suffix is generally expressed by numbers, and its meaning means that there are different specifications and varieties in the same product, and the appearance size and performance indicators of the products distinguished by the post-position The difference is different. For example: RM065 type is a carbon film adjustable resistor.

(3) Classification of specifications: The classification of resistance products will be distinguished according to the number identification, such as: 1-normal, 2-normal, 3-ultra-high frequency, 4-high resistance, 5-high temperature, 6-precision, 7 -Precision, 8-high voltage, 9-special, G-high power, T-adjustable.

　　(4) Material identification: The conventionally distinguished resistor bodies of adjustable resistors will be based on the material, and the rear part will be distinguished with several specifications and materials. For example: N-inorganic solid, J-metal film, T-carbon film, H-synthetic carbon film, S-organic solid, Y-oxide film, C-deposited film, I-glass glaze film, etc.

　　 We all know that adjustable resistors are composed of a resistor body and a rolling or sliding system. Its working principle is not much different from that of a potentiometer. The above is the relevant introduction about the structural characteristics of adjustable resistors, the selection instructions of adjustable resistors, the meaning analysis of suffix letters, etc. If you have any questions, you can contact our customer service staff for consultation! Our products are not only The specifications and models are complete, and the quality is guaranteed. Friends are welcome to consult and purchase!