I recently used a 6M crystal oscillator to phase-lock the frequency of an 18MHZ sine wave oscillator, but required the output amplitude to be constant, i.e., an automatic level control circuit. Could ...
I am doing an experiment on the Samsung arm9 s3c2410 learning board, but I find it very difficult. I don't know how to start when building the Linux platform, and I have no way to find out if there is...
www.z2comm.com is recruiting software engineers, the target group is fresh graduates or programmers with one to two years of coding experience. Basic requirements: Solid software foundation, familiar ...
A little off-topic: I thought I had summarized it, but today [url=home.php?mod=space&uid=615732]@5之丹公英[/url] asked me when I was going to summarize it, and I realized that I hadn't summarized it at al...
Nucleo-F429, a recently released board, sold at RMB 210 on Taobao, now resells at RMB 170MSP430FR5969, sold at RMB 180 on Taobao, now resells at RMB 130Discovery-F411, sold at RMB 140.7 on Taobao, now...
[i=s]This post was last edited by Xin Xin on 2014-1-4 18:40[/i] For the serial port, the most basic thing is to send and receive. Because of this example series and my personal style, I always only le...
System design is a complex process. It is not enough to just use ICs. There are many details to consider. This article uses a high-fidelity music playback system as an example to introduce how to s...[Details]
In public places such as schools, government agencies, factories and mines, as well as public corridors in residential areas, the phenomenon of long-burning lights is very common, which causes a h...[Details]
Battery life is critical for portable applications. For applications such as smoke detectors, security devices, and thermostats, factory-installed batteries need to last for more than 10 years. The...[Details]
In the previous series, we have listed some basic knowledge of C language in Tables 1 to 3. We hope that beginners can strengthen their memory of the above tables and gradually learn to use them wh...[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]
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]
Since the late 1990s, with the demand for higher system efficiency and lower power consumption, the technological update of telecommunications and data communication equipment has promoted the deve...[Details]
Traditional
virtual instruments
consist of a data acquisition
board
based on PCI bus and
corresponding software. However, with
the rapid development of
computer
network techno...[Details]
1 Introduction
Ultrasound refers to elastic vibration with a frequency higher than the audible frequency limit (i.e., in the frequency band above 20 kHz). The propagation process of this vib...[Details]
0 Introduction
Ultrasonic waves
are mechanical waves with a frequency of more than 20KHz, and the propagation speed in the air is about 340 m/s (at 20°C). Ultrasonic waves can be gene...[Details]
In the "digital pressure measurement" experimental device of applied physics, the subject technical knowledge of analog circuits, digital circuits, sensors and single-chip microcomputers is used. In o...[Details]
People who often surf the Internet until late at night, their families always complain that turning on the big lights in the living room affects their rest, but some people don't have keyboard ligh...[Details]
Rated capacity refers to the maximum output power of the UPS (the product of voltage V and current A).
Usually, the UPS power supplies sold on the market are marked with "W" (watt) for smaller...[Details]
The most important components of new energy electric vehicles are power batteries, electric motors and energy conversion control systems. The power battery must achieve high performance such as fas...[Details]
1 Introduction
CAN (Controller Area Network) bus is a kind of field bus. It is used in many industrial sectors due to its outstanding advantages such as high performance, high reliability, high...[Details]