[font=微软雅黑][size=3]The in-ear headphones I bought on JD.com a while ago broke after being used for almost a year. I usually use them carefully, but occasionally when I make or receive phone calls, the...
I just made a clock (thanks to the enthusiastic friends who helped me modify the program). After installing and running it, I found that it would be about 5 minutes faster every hour, which is almost ...
Recently, this situation occurred when exporting the BOM table. The specific situation is as follows: 1. Operating system Win7; 2. Using Altium Designer 13; 3. Office version is 2013; 4. You can use t...
I am a student who is interested in reading. I would like to ask you a question. The data read from the chip by the programmer is all in hexadecimal. The ASCII code is very messy. How can I read it? ?...
Hello everyone. Now I want to use 2440's GPIO to simulate SPI communication. The main controller is 2440 motherboard, and the slave device is LCD screen driver. 2440 main frequency works at 400Mhz. LC...
Today, with the increasing integration of functions, mobile phones can also be used as portable media players (PMP), digital cameras, handheld computers (PDAs), and even global positioning systems ...[Details]
introduction
Throughout the history of automotive lighting, power has always played an important role. Initially, cars only needed headlights to see the road in the dark. Later, other light so...[Details]
1 Introduction
Intelligent control instruments are one of the most commonly used controllers in industrial control. They are mainly aimed at a specific parameter (such as pressure, tempera...[Details]
General LED lighting has a current limiting resistor in the driving circuit, and the power consumed by the resistor has nothing to do with the LED light emission. In order to improve efficiency, a...[Details]
I've been studying dot matrix recently. It looks simple, but it takes a while to master it completely! The 8*8 dot matrix hardware circuit I'm making now is like this. The row is driven by 74HC138 + t...[Details]
Abstract: With the development and construction of BeiDou II system, China will shift from the situation dominated by GPS to the situation dominated by BeiDou II global navigation system independen...[Details]
With the widespread application of new services and technologies in the communications industry, the scale and capacity of operators' network construction are getting larger and larger, and the ris...[Details]
Introduction
As the country increases its efforts to control the atmospheric environment, motorcycle emission regulations will become stricter year by year, and motorcycles that do not meet the...[Details]
The power consumption of a switching power supply includes fixed losses caused by parasitic resistances such as semiconductor switches, magnetic components, and wiring, as well as switching losses ...[Details]
1 Introduction
At present, people have higher and higher requirements for the quality of life. When people are busy with work, soymilk machine is a new type of household beverage machine. It uses so...[Details]
introduction
The air compressor unit in the operating area of a lead-zinc mine in Guangdong is a key equipment in mining production. There are six imported Ingersoll Rand CENTAC air compress...[Details]
1 Introduction
The stepper motor is an actuator of an open-loop servo motion system, which is controlled in a pulse mode and outputs angular displacement. Compared with AC servo motors and DC servo ...[Details]
Introduction
The LED market has seen tremendous growth over the past few years. Advances in thermal dissipation, packaging, and processing have resulted in higher brightness, higher efficien...[Details]
Any power system that operates from an AC source has an associated power factor, which is defined as the way it draws current from the AC source. The power factor of an AC power system is defined a...[Details]
This article examines some of the requirements that need to be met when designing DC/DC converters used in telecom and distributed power systems (DPS). Telecom DC/DC converters have an input voltag...[Details]
Mobile and portable
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