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News on the evening of April 15th, ZTE today released its 2021 flagship mobile phones Axon 30 Pro and Axon 30 Ultra 5G (hereinafter referred to as Axon 30U), with imaging function as the main s...[Details]
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With the development of society, people's awareness of medical care is getting stronger and stronger, so the training of doctors has become a very important link. As a major aspect of doctor traini...[Details]
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There are many adjustable rectifier power supplies on the market that can output 3-12V voltage. However, most of these power supplies have rough workmanship and many problems. This time we will ma...[Details]
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The HDLC (High Level Date Link Control) protocol is one of the most widely used protocols in the field of communications. It is a bit-oriented high-level data link control procedure with powerful e...[Details]
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Netizens often ask this question: In system design, a very confusing question is how to choose a reasonable and applicable isolator. Two days ago, the author interviewed Zhou Xiaoqi, a senior appli...[Details]
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The power of the transistor is that it can control a large current through a small current. The principle of amplification is to control a large static DC through a small AC input. Suppose the transi...[Details]
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PCB is a key component of electronic products and is used in almost all electronic products. It is a key interconnection part for assembling electronic parts. It not only provides electrical connecti...[Details]
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The high energy consumption of large public buildings has become a bottleneck in the development of building energy conservation. In order to achieve energy-saving heating temperature control, this p...[Details]
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Samsung Electronics continues to produce LCD panels. In this regard, Xie Qinyi, senior research director of Omdia's display department, said that SDC mainly supplies Samsung LCD TVs, which has little...[Details]
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The development of new energy vehicles as a whole has entered a new normal. I got some insurance data for October from a friend. Let’s take BYD as an example to see the changes since July. 1) Overa...[Details]
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pre name="code" class="html" #include "stm32f10x.h" int main(void) { //1.PA.0 works in push-pull output, 50MHZ; PA.8 input floating input GPIOA- CRL=0X03; GPIOA- CRH=0X04; //2. PA.0 outpu...[Details]
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Why can ordinary audio amplifiers directly listen to FM radio in some cases? How do they restore the sound after amplifying and detecting the high-frequency electromagnetic waves propagating in spa...[Details]
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I. Overview
As data communication becomes more and more common, more and more data needs to be displayed through two or even more Vis. However, for an interface, in most cases we only need t...[Details]
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Since the performance of a microcontroller is vastly different from that of a computer, no matter in terms of space resources, memory resources, or operating frequency, they are incomparable. When pr...[Details]
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A composite switching power supply circuit diagram with power-off protection function
Figure 1. A composite switching power supply circuit with power-off protection function
具有掉电保护功能的复合型开关电...[Details]