750104 in stock German 750104 electrical components 750104 inventory

750104 electrical components refer to the aggregate of service equipment provided to a specific group of traffic sources, such as trunk lines, switching devices, and control systems. The fundamental research content of traffic theory is the relationship between traffic volume, call loss, and bundle capacity; therefore, the line bundle is an important basic concept in traffic theory. A traffic source is the service object of the line bundle, usually referring to user equipment; broadly speaking, the upper-level equipment is the traffic source for the lower-level equipment. In telephone communication, the traffic source is also called the call source. The number of service devices contained in the line bundle is called the bundle capacity. Figure 1 is a schematic diagram of the line bundle. The capacity of this line bundle is V, and it provides service to N traffic sources. Any traffic source initiating a call can occupy an idle service device in the line bundle.

750104 electrical component applications

PN junction photodiodes, like other types of photodetectors, are widely used in devices such as photoresistors, charge-coupled devices, and photomultiplier tubes. They can output corresponding analog electrical signals based on the illuminance of the received light or switch between different states in digital circuits. Photodiodes are also applied in consumer electronics, such as CD players, smoke detectors, and infrared remote control devices for televisions and air conditioners. For many applications, photodiodes or other photoconductive materials can be used. They are both suitable for measuring light and are often used in camera exposure meters, automatic brightness adjustment for street lights, etc. All types of optical sensors can be used to detect sudden illumination or to detect light emission within the same circuit system. Photodiodes are often combined with light-emitting devices to form a module, which is commonly referred to as an optocoupler. This allows the analysis of the motion of external mechanical components by analyzing the received light conditions. Another function of photodiodes is to act as an intermediary between analog and digital circuits, allowing the two circuit sections to be coupled via optical signals, which improves circuit safety. In scientific research and industry, photodiodes are often used for precise measurement of light intensity because they have better linearity than other photoconductive materials. In medical application equipment, photodiodes are also widely used, such as in X ray computed tomography and pulse detectors. PIN junction photodiodes are generally not used to measure very low light intensities. If high-sensitivity detectors are required under weak light conditions, avalanche photodiodes, charge-coupled devices, or photomultiplier tubes can play a role, such as in astronomy, spectroscopy, night vision equipment, laser rangefinders, and other applications.

750104 electrical component classification

For different application scenarios, the purpose of using varistors varies, and the voltage/current stress applied to the varistor is not the same, so the requirements for the varistor also differ. Paying attention to these differences is very important for correct usage. According to different purposes, varistors can be divided into two categories: protection varistors and circuit function varistors. ① Protection varistors: 1, distinguish between power supply protection and signal line/data line protection varistors, as they must meet different technical standard requirements. 2, according to the different continuous operating voltages applied to the varistor, varistors across power lines can be divided into AC type or DC type. The aging characteristics of varistors under these two voltage stresses are different. 7, according to the different abnormal overvoltage characteristics withstand by the varistor, varistors can be divided into three types: surge suppression type, high power type, and high energy type. ② Surge suppression type: refers to varistors used to suppress transient overvoltages such as lightning overvoltage and switching overvoltage. The occurrence of this transient overvoltage is random and non-periodic, and the peak current and voltage may be very high. The vast majority of varistors belong to this category. ③ High power type: refers to varistors used to absorb continuous pulse groups that appear periodically, such as varistors connected in parallel to switching power supply converters. Here, the impact voltage appears periodically, and the period is known. The energy value can generally be calculated. The voltage peak is not large, but due to the high frequency of occurrence, the average power is quite high. ④ High energy type: refers to varistors used to absorb magnetic energy in large inductive coils such as generator excitation coils and lifting electromagnet coils. For such applications, the main technical indicator is energy absorption capacity. The protective function of varistors can be repeated multiple times in most application scenarios, but sometimes they are made into one-time protective devices like current fuses. For example, varistors with short-circuit contacts connected in parallel to the load of certain current transformers.

750104 electrical component classification

1, fusible resistors: also called fuse resistors, they serve the dual function of a resistor and a fuse under normal conditions. When a circuit fault causes their power to exceed the rated power, they will blow like a fuse, disconnecting the connected circuit. Fusible resistors generally have small resistance values and low power ratings. 8, sensitive resistors: refer to resistors whose resistance value has sensitivity to certain physical quantities (such as temperature, humidity, light, voltage, mechanical force, and gas concentration). When these physical quantities change, the resistance value of the sensitive resistor changes accordingly, presenting different resistance values. Based on sensitivity to different physical quantities, sensitive resistors can be divided into thermistors, humidity-sensitive resistors, photoresistors, varistors, force-sensitive resistors, magnetoresistors, and gas-sensitive resistors. The materials used for sensitive resistors are almost all semiconductor materials, so these resistors are also called semiconductor resistors. The resistance of a thermistor changes with temperature; if the resistance decreases as temperature rises, it is a negative temperature coefficient thermistor. Negative temperature coefficient thermistors are widely used and can be further divided into general-purpose NTC thermistors, voltage-stabilizing NTC thermistors, and temperature-measuring NTC thermistors. The resistance of a photoresistor changes with the intensity of incident light; when the incident light increases, the resistance of the photoresistor decreases, and when the incident light weakens, the resistance value increases.

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