MAVESNIMACENYMB electrical components Germany MAVESNIMACENYMB model MAVESNIMACENYMB price

MAVESNIMACENYMB electrical component is a sensor resistor whose resistance value changes with temperature. According to different temperature coefficients, it is divided into positive temperature coefficient thermistors and negative temperature coefficient thermistors. The resistance value of a positive temperature coefficient thermistor increases as the temperature rises, while the resistance value of a negative temperature coefficient thermistor decreases as the temperature rises; both belong to semiconductor devices.

MAVESNIMACENYMB electrical component principle

When high-frequency current flows through a conductor, an electric field and a magnetic field are generated in the surrounding space. According to the distribution characteristics of the electromagnetic field in space, it can be divided into the near zone, intermediate zone, and far zone. Let R be the distance from a point in space to the conductor. The region where R ﹤﹤ λ/2π is called the near zone, where the electromagnetic field is closely related to the current and voltage in the conductor. The region where R﹥﹥λ/2π is called the far zone, where the electromagnetic field can leave the conductor and propagate into space. Its change lags behind the current and voltage on the conductor for a period of time, and the propagated electromagnetic wave is no longer directly related to the current and voltage on the wire. The electromagnetic field in this region is called the radiation field. It must be pointed out that when the length of the wire L is much smaller than the wavelength λ, the radiation is very weak; when the length of the wire L increases to be comparable to the wavelength, the current on the wire will increase significantly, thus forming stronger radiation. Transmitting antennas utilize this property of the radiation field, allowing the transmitted signal to radiate fully into space after passing through the transmitting antenna. How to make a conductor an effective radiating system? Here we first analyze the situation on the transmission line. On a parallel two-wire transmission line, to ensure only energy transmission without radiation, it is necessary to ensure that the two-wire structure is symmetrical, the current magnitude at corresponding points on the lines is opposite in direction, and the distance between the two lines<π. To effectively radiate the electromagnetic field, this symmetry of the transmission line must be broken. For example, separating the two conductors at a certain angle or removing one side can break the conductor symmetry and produce radiation. Separating the open-circuit transmission line or the conductor at a distance of π/4 from the terminal in a straight line, the current on the terminal conductor is no longer in anti-phase but in phase, so that the radiation fields of this segment of the conductor at spatial points superimpose in phase, constituting an effective radiation system. This is the simplest and most basic unit antenna, called a half-wave symmetric dipole antenna, with a characteristic impedance of 83Ω. After the electromagnetic wave is radiated from the transmitting antenna, it propagates in all directions. If a symmetric dipole is placed in the direction of electromagnetic wave propagation, an induced electromotive force will be generated on the antenna dipole under the action of the electromagnetic wave. If the antenna is connected to receiving equipment at this time, high-frequency current will be generated at the input end of the receiving equipment. In this way, the antenna plays a receiving role and converts electromagnetic waves into high-frequency current, meaning the antenna acts as a receiving antenna. The quality of reception depends not only on the strength of the radio wave but also on the directivity of the antenna and the matching between the half-wave symmetric dipole and the receiving equipment.

MAVESNIMACENYMB electrical component features

1, the function of a varactor diode is based on the principle that the capacitance between the PN junction is variable. It is a semiconductor device used as a variable capacitor in high-frequency tuning, communication, and other circuits. A varactor diode belongs to reverse-biased diodes. Changing the reverse bias voltage on its PN junction changes the PN junction capacitance. The higher the reverse bias voltage, the lower the junction capacitance. The relationship between reverse bias voltage and junction capacitance is nonlinear. 8, graphical representation of the relationship between varactor diode capacitance and reverse bias voltage: (a) Increased reverse bias causes decreased capacitance; (b) Decreased reverse bias causes increased capacitance. The capacitance tolerance range is a specified capacitance range for a varactor diode. The datasheet will display the minimum, nominal, and maximum values, which are often plotted on the graph.

MAVESNIMACENYMB 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 divided 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 have two structures: rod-shaped and cup-shaped. In discharge tubes with rod-shaped electrodes, a cylindrical heat shield is installed between the electrode and the tube wall. This heat shield ensures uniform heating of the ceramic tube body, preventing local overheating that could cause tube fracture. The heat 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 element is installed 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 add a nickel-chromium-cobalt alloy cylinder as the third electrode, i.e., the ground electrode.

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