I found a CD4013 push button switch circuit on the Internet, and replaced the pnp with a P-channel field effect MOS tube AOD417. I connected the pins as marked in the figure and connected it to a 12v ...
The weak current market is indeed too chaotic. I have been designing building intelligent systems for 6 years. I have designed all kinds of weak current systems and have never received a single cent o...
Today I watched an expert soldering DSP, it was very exciting. He used the drag soldering method, feeding a lot of tin, because it is lead-free, so after the lead was turned, the chrome iron head was ...
The topic is very simple: Assume that a system has 1 to 4 users; Each user has some data that needs to be retained after power failure. They (assuming temporarily) are char x_flag; int account; short ...
The development board finally arrived as expected. I unpacked it eagerly and found that it was still in the familiar packaging style, as shown in Figure 1.Figure 1 Development board packaging
After op...
[size=4]The test program is obviously not the main body of pmsm3_1, but there are many places that are difficult to understand. The following is my personal opinion. There may be some mistakes. I hope...
In early 2002, I started to write a working program for an IC card prepaid electricity meter. The meter used Philips' 8-bit 51-expanded single-chip microcomputer
87LPC764
, and wa...[Details]
0 Introduction
With the development of society, people pay more and more attention to security work. Monitoring products have been used in various fields instead of being used only in importan...[Details]
We know that microcontroller development tools generally include real-time online emulators and programmers. Among them, online emulators are very good tools, but they are also more expensive...[Details]
1. System Structure
This system is a simulation system of indoor air-conditioning temperature/humidity control system. The data acquisition and control center collects temperature/humidity...[Details]
LED lamps and bulbs are now rapidly replacing incandescent, halogen and CFL (compact fluorescent lamp) light sources in many general lighting applications. Flyback DC/DC converters are the power su...[Details]
Printed circuit boards ( PCBs
)
are used in most electrical products
. If a PCB has low
insulation resistance
(IR), the performance of the circuits on the PCB will be greatly reduced...[Details]
Since AC mains power may experience power outages, voltage sags and surges, continuous undervoltage and overvoltage, and frequency fluctuations during supply, these factors will affect the continuous ...[Details]
At present, how various communication technologies will evolve after 3G is a focus of great concern in the industry. Especially for TD-SCDMA, whether it can achieve smooth evolution to the next gen...[Details]
With the rapid development of cities and the improvement of citizens' living standards, the number of various vehicles in cities is growing, and the demand for parking spaces in major commercial an...[Details]
1 What is an LED floodlight?
LED downlights are also called spotlights, projection lamps, and spotlights. They are mainly used for architectural decorative lighting and commercial space lighti...[Details]
Against the backdrop of global warming, energy conservation and emission reduction have become a global hotspot and focus, which has also sounded the clarion call for the take-off of the LED lighti...[Details]
Electric bicycles have long been a means of transportation for lower-income groups due to their affordability. The largest concentrated expense in the use of electric vehicles is the cost of replac...[Details]
1 Load Regulation
Changes in power supply load will cause changes in power supply output. When the load increases, the output decreases, and vice versa, when the load decreases, the output inc...[Details]
In order to prevent the lithium battery from being damaged by abnormal conditions such as overcharge, over discharge, and overcurrent, a lithium battery protection device is usually used to prevent...[Details]