PCB substrate selection from the electrical performance, reliability, processing process requirements, economic indicators, etc. There are many substrates used for PCB, mainly including two categories: organic and inorganic. Organic substrates are made of reinforced materials such as glass fiber cloth impregnated with resin binder, then coated with Copper foil after drying, through high temperature and [...]
In PCB industry, there are many ion pollution tests for ion concentration, and more testing methods. There are many cleaning agents to clean residual ions. With the rapid development of the electronic industry, the integration of electronic products is getting higher and higher, the density of components on the circuit board is getting higher and [...]
The circuit graphics on PCB board are completed by PCB manufacturers using exposure imaging and development etching technology. Both PCB multi-layer board and flexible circuit board need exposure imaging and development technology when making circuit graphics. The following is a detailed introduction of the processing characteristics and principles of the two processes. (1) exposure. Due [...]
FPC flexible circuit board is a printed circuit board with high wiring density, light weight and thin thickness, which is made of polyimide or polyester film. It is mainly used in mobile phones, tablet computers, medical devices, LED, automotive electronics, smart wear and other products. FPC types can be divided into single-sided FPC, double-sided FPC, [...]
For a newly designed circuit board template, debugging will often encounter some difficulties, especially when the board is larger, more components, often do not know where to start. But if master a set of reasonable debugging methods, debugging will be twice the result with half the effort. PCB sample debugging generally follows the following steps: [...]
1, using diode unidirectional conductivity to prevent the input voltage reverse connection, such a good circuit is simple, the cost is low, but a little loss, because the diode have pressure drop and pressure drop at least 0.2 SS14, but also good, the advantages of schottky diode itself lies in the forward bias voltage is [...]
Overview of printed circuit board HDI high density technology, application of HDI circuit board manufacturing technology (1) fine wire technology in the future high fine wire width/spacing will be 0.20mm-o.13mm-0.08mm-0.05mm, to meet the requirements of SMT and Multichip Package (MCP). The following techniques are therefore required. (1) due to the thin wire width of the [...]
In the electronic market, various kinds of circuit boards are covered with various shapes and colors of electronic components, safety capacitor is one of the most important members, safety Y capacitor and safety X2 capacitor, respectively blue wafer and yellow box. Safety Y capacitor is flame retardant epoxy resin, safety X2 capacitor is polypropylene or [...]
Circuit board debugging: for a new design of the circuit board, debugging often encounter some difficulties, especially when the board is larger, more components, often do not know how to start. But if master a set of reasonable debugging methods, debugging will be twice the result with half the effort. For the new PCB we [...]
How to detect faults quickly? 1. Look at the state of components Get a faulty circuit board, first observe the circuit board has no obvious component damage, such as electrolytic capacitor burn and bulge, resistance burn out and power device burn out. 2. Look at the welding of the circuit board If there is no [...]