With the rapid update of electronic products, the waste of printed circuit boards (PCB), the main component of electronic waste, is also increasing. The pollution caused by PCB waste to the environment has attracted the attention of many countries. In the waste PCB, it contains lead, mercury, hexavalent chromium and other heavy metals. In the [...]
With the scrapping of a large number of household appliances, the amount of waste circuit boards is increasing, and its recycling value has attracted the attention of many investors, becoming a promising industry. The composition of the waste circuit board is complex, difficult to recover and treat, and the circuit board in the production process [...]
In order to solve the problem of time-consuming calibration, measurement equipment manufacturers have introduced Ecal electronic calibration method [7], which is a transmission standard. The calibration accuracy is mainly determined by the original calibration parts. Meanwhile, the stability of the test cable, the repeatability of the test fixture device and the interpolation algorithm of test [...]
How to achieve a simple water-based cleaning process? - heming technology Key words: circuit board cleaning, circuit board cleaning, PCBA circuit board water-based cleaning, PCBA circuit board water-based cleaning, water-based cleaning technology Introduction: electronic circuit board to achieve water-based cleaning components in the current electronic manufacturing process to achieve the direction of high reliability technical [...]
The IPC - ESD - 2020 Electrostatic discharge control program development joint standard. Including the design, establishment, implementation and maintenance of electrostatic discharge control program. Based on the historical experience of some military organizations and commercial organizations, it provides guidance for the treatment and protection during the sensitive period of electrostatic discharge. The IPC - [...]
The IPC/EIAJ - STD - 005 Specification requirements for solder paste I include appendix I. The characteristics and technical requirements of solder paste are listed, as well as the test method and standard of metal content, as well as the viscosity, collapse, solder ball, viscosity and solder paste's tin coating performance. The IPC/EIAJ - STD [...]
Like any other project you do, designing a printed circuit board requires a lot of trial and error to find the perfect PCB. As a student, it's important to try out some designs and see which one works best for the project you're working on. Fortunately, with free PCB Artist software provided by Advanced Circuits, [...]
First, the failure caused by capacitor damage is the highest in electronic equipment, especially in the electrolytic capacitor damage is the most common. Capacitance damage is shown as: capacity decreases; Total loss of capacity; The leakage; Short circuit. Capacitors play different roles in the circuit and the faults caused by them have their own characteristics. [...]
The design of printed circuit board (SMT) is one of the important components of SMT SMT assembly technology. The design quality of printed circuit board (PCB) is an important symbol to measure the technical level of surface assembly and one of the primary conditions to ensure the quality of surface assembly. Design for Manufacturing (DFM) [...]
Waste electrical and electronic products are also growing rapidly. As the core and foundation of electrical and electronic products, the casual abandonment and irregular recycling of circuit boards has brought serious environmental problems. On the other hand, waste circuit boards contain a large number of metals and non-metals with recycling value. Lvjie environmental protection circuit [...]