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The three major A-share indices opened high and ended low, with industry sectors rising and falling. The semiconductor sector led the gains strongly, with many semiconductor stocks hitting the daily ...[Details]
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The Wien bridge sine oscillator circuit uses the junction field effect tube 2N5457 as the variable resistor of the amplifier feedback circuit, which will produce a slight distortion, and the constant...[Details]
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Asynchronous motor, also known as AC induction motor, is a type of electric motor and one of the most common types of motors. It works by applying an AC voltage to the stator windings. Unlike tradi...[Details]
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“含有苯环的封装材料最终都会发生老化”。在日前召开的“2006年LED技术研讨会”上，三垦电气技术本部LED业务部长大塚康二表示，作为高功率LED封装材料，树脂类材料可能无法避免老化问题。不过，这只是需要高功率和超长寿命时的情况，假如是寿命约2万小时的产品，通过在不会形成界面的树脂材料上下功夫，完全可以使用树脂封装。
大塚表示，要想使LED成为照明等通用光源，“需要一些技术上的突破”。其中...[Details]
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1. Strictly avoid collision, severe vibration, heavy dust, moisture, oil, strong magnetism, etc. 2. Please store the sensor in the box immediately after use. 3. When the battery voltage is insuff...[Details]
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Today I debugged the ADC of stm32f407, everything went smoothly, but when I used the serial port to send the ADC results, they were all hexadecimal numbers, which was very annoying. So I decided to us...[Details]
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Based on the theoretical design, Protues software is used to perform simulation debugging and testing, and the results of debugging and testing are used to verify the reliability and correctness of...[Details]
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With the rapid development of electronic technology, electronic equipment is also developing towards functional integration and miniaturization, which brings us many conveniences, but electromagnetic...[Details]
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1. The code of the operating system software cannot be too long. Due to the relative lack of system hardware resources of the 51 series microcontrollers, if the code of the operating system is larger...[Details]
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For each electrical parameter, the frequency range over which its value is valid must be considered.
The series resistance
of a transmission line
is no exception. Like the other parameter...[Details]
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introduction
In high power factor correction AC/DC circuits, dedicated control chips such as UC3842 and UC3855A are widely used to achieve power factor correction, while in phase-shifted full-...[Details]
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Digital healthcare refers to the digitization, networking and informatization of medical services. It refers to the collection, storage, processing, extraction and data exchange of patient and mana...[Details]
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During a shooting, two acoustic events occur—the muzzle blast and the supersonic shock wave. Acoustic sensors, such as single or array microphones, can capture these sounds and use them to estimate t...[Details]
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Sanitary napkin absorption speed tester The sanitary napkin absorption speed tester consists of a standard test module, an arc-shaped sample holder, an automatic liquid adding device and an automatic...[Details]
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On October 30, the highly anticipated iQOO latest flagship phone,
iQOO 13, known as the "light of performance", was launched in Shenzhen.
This model is exclusively supplied by BOE (BOE Tech...[Details]
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