ansmann electrical components Germany ansmann model ansmann price

ansmann electrical components are electronic devices with conductivity between that of good conductors and insulators, utilizing the special electrical properties of semiconductor materials to perform specific functions. They can be used to generate, control, receive, transform, and amplify signals, as well as perform energy conversion. The semiconductor materials in semiconductor devices are silicon, germanium, or gallium arsenide, and they can be used as rectifiers, oscillators, light emitters, amplifiers, photodetectors, and other equipment. To distinguish them from integrated circuits, they are sometimes referred to as discrete devices. The basic structure of most two-terminal devices (i.e., crystal diodes) is a PN junction. Semiconductor devices typically utilize different semiconductor materials, processes, and geometric structures, resulting in a wide variety of crystal diodes with diverse functions and applications. The frequency coverage of crystal diodes ranges from low frequency, high frequency, microwave, millimeter wave, infrared, up to light waves. Three-terminal devices are generally active devices, with typical representatives being various transistors (also known as crystal triodes). Transistors can be divided into bipolar junction transistors and field-effect transistors. Depending on the application, transistors can be classified into power transistors, microwave transistors, and low-noise transistors. In addition to general-purpose transistors used for amplification, oscillation, and switching, there are transistors for special purposes, such as phototransistors, magnetosensitive transistors, and field-effect sensors. These devices can convert information about environmental factors into electrical signals and also provide amplification like general transistors to obtain larger output signals. Furthermore, there are other special devices, such as unijunction transistors which can be used to generate sawtooth waves, thyristors which can be used in various high-current control circuits, and charge-coupled devices which can be used as imaging devices or information storage devices. In military equipment such as communications and radar, weak signals are mainly received by high-sensitivity, low-noise semiconductor receiving devices. With the rapid development of microwave communication technology, low-noise microwave semiconductor devices have developed rapidly, with increasing operating frequencies and decreasing noise figures. Due to their excellent performance, small size, light weight, and low power consumption, microwave semiconductor devices have been widely applied in air defense and anti-missile systems, electronic warfare systems, etc.

ansmann electrical component principles

A resistor consists of three parts: the resistive element, the backbone, and the leads (in solid-core resistors, the resistive element and backbone are combined into one), and only the resistive element determines the resistance value. The volt-ampere characteristic is represented by a graphical curve showing the relationship between voltage and current at the resistor terminals. When voltage and current are proportional (the characteristic is a straight line), it is called a linear resistor; otherwise, it is called a non-linear resistor. The maximum power dissipation allowed for a resistor to operate continuously at the rated temperature (maximum ambient temperature) tR. For each type of resistor, a maximum working voltage is also specified; that is, when the resistance value is high, the maximum working voltage must not be exceeded even if the rated power is not reached. The rated power of a resistor refers to the maximum power allowed to be consumed during long-term continuous operation in DC or AC circuits. Load characteristics: When the ambient working temperature is below tR, the resistor must not exceed its rated power; when it exceeds tR, the load power must be derated. Each type of resistor has specified load characteristics. In addition, the allowable load is correspondingly reduced under low pressure. Under pulse load, the average pulse power is much lower than the rated power, and separate specifications generally apply.

ansmann electrical component principles

A Schottky diode is a metal-semiconductor device made using noble metals (gold, silver, aluminum, platinum, etc.) A as the anode and N-type semiconductor B as the cathode, utilizing the rectifying properties of the barrier formed at the contact surface between the two. Because there are a large number of electrons in the N-type semiconductor and only a very small number of free electrons in the noble metal, electrons diffuse from the high-concentration B to the low-concentration A. Obviously, there are no holes in the metal A, so there is no diffusion movement of holes from A to B. As electrons continuously diffuse from B to A, the electron concentration on the surface of B gradually decreases, destroying surface electrical neutrality, thus forming a barrier whose electric field direction is B → A. However, under the influence of this electric field, electrons in A also produce a drift motion from A → B, thereby weakening the electric field formed by the diffusion motion. After a space charge region of a certain width is established, the electron drift motion caused by the electric field and the electron diffusion motion caused by the concentration difference reach a relative balance, forming the Schottky barrier. The internal circuit structure of a typical Schottky rectifier uses N-type semiconductor as the substrate, on which an N-epitaxial layer doped with arsenic is formed. The anode uses materials such as molybdenum or aluminum to form a barrier layer. Silicon dioxide is used to eliminate the electric field in the edge region, improving the voltage withstand value of the tube. The N-type substrate has a very small on-state resistance, and its doping concentration is 103% times higher than that of the H-layer. An N+ cathode layer is formed under the substrate to reduce the contact resistance of the cathode. By adjusting structural parameters, a Schottky barrier is formed between the N-type substrate and the anode metal.

ansmann electrical component structure

The simplest switch has two pieces of metal called "contacts". When the two contacts touch, they form a current loop; when they do not touch, the current path is open. When selecting contact metals, their resistance to corrosion must be considered, because most metals form insulating oxides after oxidation, preventing the contacts from working properly. Factors such as electrical conductivity, hardness, mechanical strength, cost, and toxicity must also be considered when selecting contact metals. Sometimes, corrosion-resistant metals are plated onto the contacts. Plating is generally applied to the contact surfaces to avoid performance degradation due to oxides. Sometimes, non-metallic conductive materials, such as conductive plastics, are also used for contact surfaces. In addition to contacts, switches have movable parts that make or break the contact. Switches can be classified into lever switches, push-button switches, rocker switches, etc., based on the different movable parts, and the movable parts can also be other types of mechanical linkages.

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