hagemann electrical components German hagemann models hagemann prices

hagemann electrical components are resistive devices with nonlinear voltage-current characteristics, primarily used for voltage clamping when circuits experience overvoltage, absorbing excess current to protect sensitive components. The resistive body material of varistors is semiconductor, making them a type of semiconductor resistor. The widely used "zinc oxide" varistor has a main body composed of divalent zinc and hexavalent oxygen. Therefore, from a materials perspective, zinc oxide varistors are a type of "II-VI group oxide semiconductor." In Taiwan, varistors are called "surge absorbers," and are sometimes also referred to as "electric shock (surge) suppressors (absorbers)." Varistors are voltage-limiting protection devices. Utilizing the nonlinear characteristics of varistors, when overvoltage appears across the two poles of a varistor, it can clamp the voltage to a relatively fixed value, thereby protecting downstream circuits. The main parameters of varistors include: varistor voltage, current handling capacity, junction capacitance, response time, etc. The response time of varistors is in the ns range, faster than gas discharge tubes but slightly slower than TVS tubes; generally, this response speed meets the requirements for overvoltage protection in electronic circuits. The junction capacitance of varistors is typically in the range of hundreds to thousands of Pf, making them often unsuitable for direct application in high-frequency signal line protection. When applied in AC circuit protection, their larger junction capacitance increases leakage current, which must be fully considered in protection circuit design. Varistors have a large current handling capacity, though smaller than that of gas discharge tubes. Varistors, abbreviated as VDR, are voltage-sensitive nonlinear overvoltage protection semiconductor components.

hagemann electrical component principles

Mainly consists of LC circuits composed of capacitors and inductors, generating free oscillation through the mutual conversion of electric field energy and magnetic field energy. To sustain oscillation, an amplifier circuit with positive feedback is required. LC oscillators are further divided into transformer-coupled and three-point oscillators. Many applications use quartz crystal oscillators, and there are also LC oscillators composed of integrated operational amplifiers. Since component parameters cannot be perfectly identical, the states of the two transistors change at the moment of power-up. This change becomes increasingly intense due to positive feedback, leading to a quasi-stable state. During the quasi-stable period, the other transistor gradually charges via the capacitor and then conducts or cuts off, causing the state to flip and reach another quasi-stable state. This cycle repeats to form oscillation.

hagemann electrical component characteristics

(1) loudspeakers have two terminals (two lead wires). When a single loudspeaker is used, the two pins have no polarity distinction; when multiple loudspeakers are used simultaneously, the two pins have polarity distinctions. (2) loudspeakers have a paper cone, which is usually black, but can also be white. (3) loudspeakers come in several major shapes, such as circular, square, and oval. (4) loudspeaker paper cones have magnets on the back. With external magnet loudspeakers, you can feel the presence of magnetism when touching the magnet with a metal screwdriver; internal magnet loudspeakers do not give this sensation, but there is indeed a magnet inside the housing. (5) loudspeakers are mounted on machine panels or inside speaker enclosures.

hagemann electrical component principles

In information technology, digital integrated circuits are the mainstay, processing information carried by digital signals, which take discrete values in terms of time and magnitude. However, signals in nature change continuously in time and magnitude, such as wind sound and water flow; such signals are called analog signals. Correspondingly, circuits that process analog signals are called analog circuits, and integrated circuits used to process analog signals are called analog integrated circuits. Obviously, digital circuits cannot directly interface with the natural world; merely for the convenience of processing or transmission, and to fully utilize the advantages of digital systems, analog signals are first converted into digital signals, input into modern digital systems with large capacity, high speed, strong anti-interference ability, and good confidentiality for processing, and then reconverted into analog signals for output. The mainstay of integrated circuits is the transistor, and analog integrated circuits are no exception, except that they utilize the amplification effect of transistors, whereas digital integrated circuits utilize the switching effect of transistors. Early analog integrated circuits mostly used bipolar transistors. Due to the maturity of CMOS technology, the disadvantage of slow speed in early CMOS circuits was overcome, and it offers the advantages of low power consumption and convenient process upgrades (CMOS scaling). Today, analog integrated circuits and mixed-signal integrated circuits (integrating digital and analog circuits) are also commonly designed and implemented using CMOS.

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