I am testing a 24-bit DAC chip PCM1789 recently (PCM1804 will be tested next). The output noise is very large, close to 100mV. I added a low-pass filter to the output, but the effect is still not idea...
Hello everyone! I'm working on the gprs module to access the Internet recently, but I've encountered some problems. I hope you can help me. I'll be grateful! I'm using the Siemens MC39I GPRS module, u...
I can locate the device normally using the positioning software, but when I use the hyperterminal to adjust the baud rate to 38400, the code is garbled. I have tried all the baud rates but none of the...
I recently wrote a program to test the reading and writing of the LPC1788 on-chip EEPROM. The program runs normally when downloaded to the on-chip FLASH, and the initialization and reading and writing...
With the promotion of the construction of intelligent communities in the country, anti-theft systems have become essential equipment for intelligent communities. Especially in recent years, the urg...[Details]
This program is written to simulate the serial port hardware mechanism. When used, a timed interrupt can be set with a time interval of 1/4 baud rate. The receiving function is called once for ea...[Details]
A single-chip microcomputer is also called a single-chip microcontroller. It is not a chip that completes a certain logical function, but a computer system integrated into one chip. In general, a c...[Details]
In recent years, the market for mobile/portable devices such as smartphones and laptops has continued to grow rapidly. While these products continue to integrate more new features to enhance the ...[Details]
1. Introduction
Light control circuit plays a vital role in urban street lamps or corridor lighting. With light control circuit, the lights can be automatically turned on and off according to ...[Details]
DSP (digital signal processor) is used more and more frequently in today's engineering applications. There are three main reasons for this: first, it has powerful computing power and is capable of ...[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]
We know that the inverter consists of two parts: the main circuit and the control circuit. Due to the nonlinearity of the main circuit (switching action), the inverter itself is a source of harmoni...[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]
The production process of lithium batteries does not mention the previous processes such as material preparation, winding, liquid injection, and packaging, but only talks about the final formation ...[Details]
Leakage current is generated by parasitic resistance paths between the measurement circuit and a nearby voltage source. This current can significantly reduce the accuracy of low current measurement...[Details]
Introduction
my country's rapid economic growth is mainly due to the development of manufacturing and the acceleration of urbanization. However, urbanization cannot be achieved at the expense ...[Details]
introduction
Belt drive is a common transmission device used in industrial production. Its commonly used speed detection device is a photoelectric encoder installed at the rotating end of th...[Details]
1. Brief Introduction
With the continuous development and improvement of single-chip microcomputer technology, single-chip microcomputers have been widely used in all walks of life, and ...[Details]
1. Basic principles of organic/polymer solar cells
The basic principle of organic/polymer solar cells is to use the photovoltaic effect generated by light incident on the heterojunction of sem...[Details]
PCB Design
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