In the manufacturing of printed circuit boards (PCBs), it is common to encounter solder bridging issues, where unexpected solder connections occur between adjacent pads. This is mainly due to improper pad setup, and if not addressed promptly, it can lead to circuit shorts, affecting normal functionality. So how do you choose pads? Perhaps you can … Read more
Like many other great inventions in history, the printed circuit board (PCB) as we know it today is built on the foundation of historical advancements. In our little corner of the world, we can trace the history of PCBs back over 130 years, when the great industrial machines of the world were just beginning to … Read more
Advertisement Divider PCB Network City News Professor Bai Rongsheng is well-known in the industry and has been writing articles related to circuit boards and their upstream and downstream since 1988. He has published more than ten professional books including “The Complete Book on PCB Wet Processes”, “PCB and Lead-Free Soldering”, “PCB Terminology Handbook”, “PCB Terminology … Read more
To properly place SMT components, the PCB must remain completely flat. For accurate placement, the pick-and-place machine must release the SMT components at the same height above the circuit board for all components. If the PCB is warped, meaning it is not flat, the machine cannot maintain a constant height when placing components on the … Read more
Purpose This article introduces the implementation principles of the ROS Robot Operating System, analyzing how ROS code is implemented from the lowest level. 1. Serialization Serializing the content of communication (i.e., messages) is the foundation of communication, so we first study serialization. Although I have been engaged in robotics learning and research for a long … Read more
When PCBA designers design circuit boards, they often leave process edges. Do you know why this is done? What are the benefits of designing process edges?Today, I will explain why PCBA needs to design process edges.The PCBA process edge, also known as the working edge, is a long strip of blank board edge set aside … Read more
Most Popular, Active, and Influential in the SMT Industry WeChat Official Account — SMT Top Networking Circle First Media for Mobile Internet Marketing in SMT Manufacturing SMT Top Networking Circle 1. What are the inspection standards for PCBA boards? First, let us understand the introduction of quality inspection standards. 1. Serious defects (CR): Any defect … Read more
PCBA Process Flow The PCBA process is quite complex and typically goes through nearly 50 procedures, including circuit board manufacturing, component procurement and inspection, SMT assembly, DIP insertion, PCBA testing, programming, and packaging. Among these, the circuit board manufacturing consists of 20 to 30 procedures, making it extremely complex. The following diagram illustrates the PCBA … Read more
From the level of the thoracic inlet to the main pulmonary artery window, and from below the tracheal bifurcation to the level of the hepatic vein, each layer includes the positioning plane, axial CT images, corresponding schematic diagrams, anatomical structure names, simplified diagrams, lymph nodes, and pulmonary segment names. It’s incredibly comprehensive! First Layer: Thoracic … Read more
1. Basic Actions 1. The first injection of plastic is done at low speed, moving the nozzle away from the cold material head before increasing the second-stage injection speed to fill the mold cavity. This shortens the time for the plastic to flow to the end of the gate, maintaining the lowest viscosity of the … Read more