1. What is a Dielectric? A dielectric refers to a substance or space that can transmit force, energy, or information under specific conditions. In physics and engineering, dielectrics typically refer to solids, liquids, or gases that can transmit mechanical waves, electromagnetic waves, etc. For example, in acoustics, air, water, and solids can serve as media … Read more
In PCB (Printed Circuit Board) design, factors such as signal transmission stability and impedance matching are typically considered. Choosing the appropriate stacking scheme is crucial to meet design requirements. In certain cases, especially when designing six-layer boards, a special design scheme known as ‘pseudo eight-layer’ may be adopted. The ‘pseudo eight-layer’ actually refers to a … Read more
1. Problem Description A certain dashcam requires an external adapter for testing. During power-on testing, it was found to exceed standards, specifically at frequencies of 84MHz, 144MHz, and 168MHz. The cause of the excessive radiation needs to be analyzed, and corresponding countermeasures should be provided. The radiation test data is as follows:2. Analysis of Radiation … Read more
Capacitors play a crucial role in high-speed PCB design and are typically the most used components on a PCB. In PCBs, capacitors are generally categorized into filtering capacitors, decoupling capacitors, and energy storage capacitors. 1. Power Output Capacitors, Filtering Capacitors We usually refer to the capacitors in the input and output circuits of the power … Read more
PCB, known as printed circuit board, is an essential interconnection component in electronic products, often referred to as the “mother of electronic products.”As the foundation of the electronic information industry, the PCB printed circuit board market is vast. According to the report published by the China Business Industry Research Institute titled “2023-2028 Development Trends and … Read more
During the reflow soldering process, circuit boards are often prone to warping and bending. In severe cases, this can lead to issues such as cold solder joints and component misalignment. How can we overcome these challenges? 1. The Dangers of PCB Deformation In automated surface mount lines, if the circuit board is not flat, it … Read more
1. Purpose Standardize the PCB pad design process for products, specifying the relevant parameters of the PCB pad design process, ensuring that the PCB design meets the technical specifications for manufacturability, testability, safety regulations, EMC, EMI, etc., and building the process, technology, quality, and cost advantages of the product during the design process. 2. Scope … Read more
Previously, I wrote an article on my blog titled “Why Convert PCB Files to GERBER Files and Drill Data for PCB Manufacturers”. That article simply explained why this is necessary. In this article, I will discuss how to convert PCB design files into the corresponding Gerber files and some common pitfalls to avoid. Many engineers … Read more
After designing the PCB, we send it to the PCB manufacturer for prototyping or mass production. When placing an order with the manufacturer, we include a PCB processing technology specification document, which specifies the type of PCB surface treatment process to be used. Different PCB surface treatment processes can significantly affect the final PCB processing … Read more
Today, someone sent a picture to Lao Wu, asking about the several white translucent substances on the fixed seat of the PCB shown in the image. He didn’t know what they were or why they appeared on the PCB. I looked at the picture and thought it should be hot melt adhesive used for fixing … Read more