One, LED digital tube. LED digital tube also known as semiconductor digital tube ( Figure 1-1-5 ), it is a number of light-emitting diodes arranged in a fixed pattern and packaged together the most commonly used digital display one of the …

1.現在の増幅率ベータ電流増幅率は電流増幅率であり、トランジスタの増幅力を示すために使用されます。トライオードの動作状態に応じて、現在の増幅率はDC増幅率とAC増幅率に分けられます。DC増幅率は、静的信号が送信されていないときのコレクター電流Icと…

XC3S1400A-5FGG484C XC3S1400A-5FGG484C ALLICDATA ELECTRONICS LIMITED is a component supplier composed of professional electronic technicians. We are specialized in selling electronic components such as integrated circuits, diodes, thyristor…

The failure of the timer usually occurs on the reed and the contact point. Due to the frequent contact of the contacts of the timer, the contact instantaneous current is very large, and the contact often occurs oxidation, corrosion and oth…

( 1 ) Characteristics of digital circuit digital logic gate circuit referred to as digital circuit, which has the following characteristics : 1 ) strict logic. 2 ) Strict timing. 3 ) There are only two logical levels ( or pulses ). 4 ) The…

Humidity sensitive resistors mainly include lithium chloride humidity sensitive resistor, carbon humidity sensitive resistor and oxide humidity sensitive resistor. It is composed of humidity sensitive layer, electrode and insulator. Its se…

( 1 ) Working frequency Transformer core loss has a great relationship with frequency, so it should be designed and used according to the frequency, this frequency is called the operating frequency. ( 2 ) Under specified frequency and volt…

White LED has a place in the field of lighting, but in order to replace the traditional lighting equipment, the related technologies need to be improved. In view of the current challenges faced by white-light LED, its development trends ca…

A photoresistor is a type of special resistor that changes resistance with light. Detection method of the photosensitive resistor: 1). Use a piece of black paper to cover the transmittance window of the photosensitive resistor. At this tim…

Cell phone sensorCell phone sensors can also identify which sensors the phone hardware supports and provide sensing tools that play an important role in our daily lives. The distance sensor consists of an infrared LED light and an infrared…

Is the notebook cooler a single fan or a fan?The fan is actually useless. The key is that the fan should be in contact with the suction port at the bottom of the notebook. Multiple fans may not be right. Single fans are generally large fan…

MAP sensorMAP is the intake pressure sensor. The intake pressure sensor detects the absolute pressure of the intake manifold behind the throttle. It detects the change of the absolute pressure in the manifold according to the engine speed …

Is the LED display a liquid crystal display?The LCD is a liquid crystal, and the backlight has two ways, namely a cathode ray CCFL and a light-emitting diode LED, both of which are LCD liquid crystals.These two methods have no advantages a…

First, the whole machine inspection. Inspection refers to the measurement, inspection, test, or measurement of one or more characteristics of an entity, and the result and the national standard, to determine the eligibility of each feature…

( 2 ) Climate testClimate test is used to check the design, process, and structure of products to prevent or weaken adverse weather conditions on raw materials, measures for the impact of components and machine parameters. Climate test can…

1. Wooden cases packed in wooden cases are generally used for mechanical and electromechanical products of larger size and heavier weight. However, in order to better protect the environment and save wood, modern product packaging presents…

The principle of the radio analysis1. The block diagram of the superheterodyne radio is relative to the direct amplification of the radio, the superheterodyne amplifier is shown in the block diagram of the structure as shown in 3-1-1 The s…

1 Welding temperature. For Sn-Cu, Sn-Ag, Sn AgCu solder, the melting point is above 220C, and the melting point is about 40C, this requires a higher welding temperature, so higher requirements for the heat resistance of equipment, tools, e…

Ask 6. What is an electromagnet?An electromagnet is a component that converts electromagnetic energy into mechanical energy, which is divided into a direct current electromagnet and an alternating current electromagnet. (1) the structure p…

Q 5. How to test the replacement of the microwave high voltage power transformer?The RX1 gear is used to measure the cold resistance of the transformer. The secondary winding is usually a few ohms; if it is too small, there may be inter tu…

Question 3. how to detect and replace the magnetron?( 1 ) The magnetron detects the high voltage leads on the filament terminal of the magnetron, and uses the multimeter to measure the cold resistance of the filament, normal is less than 1…

Q1：What is the magnetron of the microwave oven? The magnetron can be divided into continuous wave magnetron and pulse magnetron. The former is mainly used in household microwave oven, medical microwave therapy machine, scalpel and other s…

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Q3. How to repair the loudspeaker after it is damaged? From the outside, it is observed that whether the iron frame of the loudspeaker is rusty : whether the paper basin is damp or not, ( 1 ) Check and develop the teaching equipment from t…

what is a loudspeaker?Ask 1. what is a loudspeaker? What is the effect?Loudspeaker, also known as loudspeaker, is an electroacoustic converter that converts analog speech signals into sound.Wave. It is widely used in various electronic dev…

Ask 1. what is a surface wave filter?Surface acoustic wave filter (SAWF) is an integrated filter. Its characteristics are small volume, light weight, simple manufacturing process, high center frequency, wide relative bandwidth, and rectang…

Q5. How to detect ceramic filters? ( 1 ) It is estimated that the resistance value of RX10k2 is infinite, and if the measured value deviates too much, the reading is very small, which belongs to short circuit fault. (2). The Darlington tub…

1.3 Inductance coil of inductor is wound around the insulating tube by wire, and the wires are insulated from each other, and the insulating tube can be hollow, it can also contain an iron core or a core, or inductance. Using L, they have …

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The main characteristic of the diode is Danxian. First, the main parameters of the diode.1.Maximum current.It refers to the maximum positive current allowed to pass through the diode during long-term operation, which is related to PN junct…