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Linux follows allocation, mapping and use for port IO usage
struct resource *request_mem_region(unsigned long start,unsigned long len,char *name);
Returns NULL if the application fails, o...[Details]
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The range self-switching frequency meter is controlled by AT89C51 single-chip microcomputer, and is mainly composed of five modules: signal amplification and shaping circuit, single-chip microcom...[Details]
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The simplest white light LED is obtained by adding phosphor to blue light LED, also known as 1-PCLED (Phosphor Converted LED), and its basic structure is shown in Figure 1. Because this LED is encapsu...[Details]
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On the morning of March 20, Dunhuang City and Xinjiang Guanghui Group held a symposium in Xinjiang. Han Shifa, Party Secretary and Executive Vice President of Xinjiang Guanghui Group, leaders of China...[Details]
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In recent years, with the development of intelligence and networking, car manufacturers have racked their brains in the design of interior center consoles. In addition to the previously popular float...[Details]
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It is already known that Samsung will launch the new Galaxy S21 series at the end of February, but whether the Galaxy Note series, which has disappeared for nearly two years, will return is also a co...[Details]
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A programmable amplifier with a gain of 40 to 90 dB can be selected in 10 dB increments.
Function of the circuit
When using an OP amplifier for high-multiple AC amplification, if the voltage d...[Details]
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Ripple: Ideally, the DC voltage output by the power supply should be a fixed value, but in many cases it is obtained by rectifying and filtering the AC voltage. Due to unclean filtering, there will b...[Details]
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Lithium-ion batteries, which have the advantages of high voltage, high capacity, long cycle life and good safety performance, have broad application prospects in portable electronic devices, electr...[Details]
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Fluke's electrical measuring instruments are recognized around the world for their ruggedness, reliability, accuracy and reproducibility. The 8808a five-and-a-half-digit digital multimeter is also a ...[Details]
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On October 28, Tuhu Auto Service signed a strategic cooperation agreement with Teladian, a subsidiary of Trede. The two parties announced that they would innovate the cooperation model of charging ...[Details]
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0 Introduction
I've been learning MQTT recently and found that MQTT is quite useful, so I spent some time making a simple application example, hoping to give some reference to those who need to do th...[Details]
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choose The voltage specification of the IGBT module is closely related to the input power supply of the device used, that is, the test power supply voltage. The relationship between them is shown in ...[Details]
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Data released by the China Association of Automobile Manufacturers showed that domestic automobile production and sales in May were 2.04 million and 2.128 million units, down 8.7% and 5.5% month-on-m...[Details]
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~ Helping improve the efficiency of vehicle-mounted electric compressors and industrial equipment inverters~
ROHM (headquartered in Kyoto, Japan), a world-renowned semiconductor manufa...[Details]
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