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sigma electrical components are Schottky barrier diodes named after their inventor, Dr. Schottky. Schottky barrier diodes are not made using the principle of forming a PN junction by contact between P-type semiconductor and N-type semiconductor, but rather using the principle of a metal-semiconductor junction formed by contact between metal and semiconductor. Therefore, Schottky barrier diodes are also called metal-semiconductor (contact) diodes or surface barrier diodes; they are a type of hot-carrier diode.

sigma electrical component structure

Inductors generally consist of a bobbin, winding, shield, encapsulation material, magnetic core, or iron core. 1, Bobbin The bobbin refers to the support for winding the coil. For some larger fixed inductors or adjustable inductors (such as oscillator coils, chokes, etc.), enameled wire (or silk-covered wire) is mostly wound around the bobbin, and then a magnetic core, copper core, or iron core is inserted into the inner cavity of the bobbin to increase its inductance. Bobbins are usually made of plastic, bakelite, or ceramic, and can be made into different shapes according to actual needs. Small inductors (such as color-code inductors) generally do not use bobbins, but directly wind enameled wire onto the magnetic core. Air-core inductors (also called formerless coils or air-core coils, mostly used in high-frequency circuits) do not use magnetic cores, bobbins, or shields; instead, they are first wound on a mold, which is then removed, and the turns of the coil are spaced apart by a certain distance. 2, Winding A winding refers to a set of coils with specified functions; it is the basic component of an inductor. Windings are divided into single-layer and multi-layer types. Single-layer windings come in two forms: close-wound (where each turn of wire is next to the previous one during winding) and space-wound (where there is a certain distance between each turn of wire during winding); multi-layer windings include layered flat winding, random winding, honeycomb winding, and other methods. 3, Magnetic Core and Magnetic Rod Magnetic cores and magnetic rods are generally made of materials such as nickel-zinc ferrite or manganese-zinc ferrite, and come in various shapes such as "I" shape, cylindrical, cap shape, "E" shape, pot shape, etc. 4, Iron Core Iron core materials mainly include silicon steel sheets, permalloy, etc., and their shape is mostly "E" type. 5, Shield To prevent the magnetic field generated by some inductors during operation from affecting the normal operation of other circuits and components, a metal shield is added (such as the oscillator coil in semiconductor radios). Using a shield increases coil loss, reducing the Q value. 11, Encapsulation Material After some inductors (such as color-code inductors, color-ring inductors, etc.) are wound, the coil and magnetic core are sealed with encapsulation material. Encapsulation materials include plastic or epoxy resin.

sigma electrical component characteristics

Sensitivity refers to the ratio of the change in output to the change in input of a sensor under steady-state operating conditions. It is the slope of the output-input characteristic curve. If the relationship between the sensor's output and input is linear, then the sensitivity S is a constant. Otherwise, it will vary with changes in the input. The dimension of sensitivity is the ratio of the dimensions of the output and input quantities. When the dimensions of the sensor's output and input quantities are the same, sensitivity can be understood as the amplification factor. Increasing sensitivity yields higher measurement accuracy. However, the higher the sensitivity, the narrower the measurement range, and stability is often poorer.

sigma electrical component structure

Some gas discharge tubes use glass as the tube enclosure, while others use ceramic as the enclosure. The discharge tube is filled with inert gases with stable electrical properties (such as argon and neon). Common discharge tubes have two or three discharge electrodes, separated by inert gas. Based on the number of electrodes, discharge tubes can be classified into two-electrode and three-electrode discharge tubes. Ceramic two-electrode discharge tubes consist mainly of pure iron electrodes, nickel-chromium-cobalt alloy caps, silver-copper welding caps, and ceramic tube bodies. The discharge electrodes inside the tube are coated with radioactive oxides, and the inner wall of the tube body is also coated with radioactive elements to improve discharge characteristics. Discharge electrodes mainly come in rod and cup structures. In discharge tubes with rod-shaped electrodes, a cylindrical thermal shield is installed between the electrode and the tube wall. This thermal shield helps distribute heat evenly across the ceramic tube body, preventing local overheating that could cause the tube to crack. The thermal shield is also coated with radioactive oxides to further reduce discharge dispersion. In discharge tubes with cup-shaped electrodes, a molybdenum mesh is installed at the cup opening, and cesium is placed inside the cup, also serving to reduce discharge dispersion. Three-electrode discharge tubes are also composed of pure iron electrodes, nickel-chromium-cobalt alloy caps, silver-copper welding caps, and ceramic tube bodies. Unlike two-electrode discharge tubes, three-electrode discharge tubes include a nickel-chromium-cobalt alloy cylinder as the third electrode, i.e., the ground electrode.

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