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 Printing circuit board (PCB) is the basis of most electronic products. The PCB structure is simple. The most common connection of PCB is computer hardware. However, it is also used for radio, TV, mobile phone, etc. The performance of PCB depends on various factors, such as manufacturing materials, costs, manufacturing, prototypes, etc. In addition, PCB thickness also has a very important impact on the overall performance and durability, which affects the resistance and conductivity of PCB; therefore, it is necessary to work in perfect thickness. Whenever we talk about "standard" features or some projects, we talk about the characteristics of "standards" or some projects. When the benchmark is measured, we refer to the perfect feature we want to achieve. Therefore, our products have undergone and passed all performance, weight, durability, reliability and the most important quality testing. PCB slices: PCB sheets do not have a fixed standard thickness measurement va

 For the majority of PCB customers, how to choose a PCB manufacturer that can realize its design needs is a headache. When customers do not understand the strength of the manufacturer, they often log in to the official website of various manufacturers to check the information of various corporate information before making an order. However, too much and false information on the website often affects the judgment of customers, leading to unpleasant experiences in the process of cooperation with manufacturers, such as delays, unable to reach the process, and quality problems. So, how to choose the right PCB prototype manufacturer? 1. high -quality production equipment production equipment is an important factor in ensuring product quality. Choosing a manufacturer with advanced production equipment can ensure the accuracy and stability of the product. In addition, the update of production equipment also helps improve production efficiency and product quality. 2. Perfect quality control sy

 In the SMT patch processing process of the PCBA industry, the AOI detector is essential. It is a new piece of equipment that has only become popular in recent years. It can automatically inspect, automatically alarm, show anomalies, and fully automate. AOI detection can better detect problems with problems to ensure product quality. Next, I will introduce the principles and benefits of AOI detection. AOI detection principle Take SMT detection as an example. When automatically detected, the machine automatically scans the PCB through the camera, collects images, and compares the tested solder joints with the qualified parameters in the database. After image processing, the sign displayed/marked the defect for repair. Of course, AOI detection can be used not only for SMT detection, but also for the following processes: 1. After printing tin paste, it mainly checks the printing of welded paste; 2. After the SMT stickers are placed, check the correctness of the patch, you can find errors

 LM339 (Four-Way Differential Motion Comparison) is a common integrated circuit with four independent voltage comparators inside the voltage comparator chip. It is mainly used in high voltage digital logic gate circuits. LM339 can easily form various voltage comparator circuits and oscillator circuits. Characteristic (1) The breakdown voltage is small, the typical value is 2mv; (2) The range of the power supply voltage is wide, the single power supply is 2-36V, and the dual power supply voltage is ± 1V-± 18V; (3) The internal resistance of the comparator signal source is relatively large; (4) The common modular range is large, 0 ~ (ucc-1.5V) vo; (5) Differential input voltage range is large, which can be equal to the power supply voltage; (6) The output potential can be selected flexibly and easily. LM339 application (1) This type of circuit is very widely used in non-steady-state multi-resonant circuit, used in single-state trigger, TTL/MOS logic converter. "And" door circui

 In PCB board design, circuit design is the most basic for engineers. However, many engineers often be cautious when designing with complex and difficult PCB boards, but ignore some places to pay attention to when the basic PCB board design, which leads to errors. It can cause a perfect circuit diagram to have problems when converted into a PCB board or break completely. Therefore, in order to help engineers reduce design changes in PCB board design and improve work efficiency, several aspects should be paid attention to during the PCB board design process. 1. Make physical border The closed physical boundary is important for future component layout and wiring, and it must be accurate, otherwise installation problems will occur in the future. In the corner, it is best to use the arc. On the one hand, it can avoid scratching workers with sharp corners, and at the same time, it can reduce the stress effect. 2 component layout The layout of components has a great impact on the quality of

 The overlapping layer refers to a collection of copper layers and PCB insulating layers before finalizing the circuit board design. It is necessary to be compact electronic products, which is why the PCB layer stacked in the electronics field is crucial. In order to make electronic products have a compact design, designers believe that PCBs containing a multi-layered design and 3D appearance need to be installed. Multi-layers help improve the board's ability to distribute energy, high-speed support signals, eliminate electromagnetic interference, and minimize cross-interference. Why do I need to perform the PCB layer? 1. Continuous development As the current technology is becoming more and more developed, the requirements of electronic products have become higher and higher. I hope PCB is small and light, and also hope to have better functionality and reliability and longer life. This will lead to multilayer PCBs. Stack two or more single-sided and/or double-sided PCBs together, a

 Electronic products are already very popular in our daily lives, occupying very important positions in life, such as mobile phones, computers, TVs, etc. These devices are made up of tens of millions of electronic components. What are the common electronic components we often use? Let's take a look today. 1. Commonly used electronic components First of all, let's take a look at the commonly used electronic components. Generally, commonly used electronic components are: capacitors, resistors, electric sensors, potentiocators, diodes, triode, electronics, relays, transformers, connectors, various sensitive components, resonators, filters, switches, etc. 2. the top 10 rankings of commonly used electronic components Next, let's look at the top 10 rankings of commonly used electronic components to see which component can become the boss. 10Third place: Transformer. The working principle of the transformer is to use the principle of electromagnetic induction to change the AC vo