Polarized components require special attention throughout the PCBA (Printed Circuit Board Assembly) processing, as incorrect orientation of polarized components can lead to mass failures and the complete failure of the PCBA board. Therefore, it is crucial for engineering and production personnel to understand SMT polarized components. 1. Definition of Polarity Polarity refers to the positive … Read more
The wiring formation process should include a formal design evaluation of the wiring details, with participation from as many relevant departments as possible within the company, such as manufacturing, assembly, and testing. The wiring scheme approved by representatives from the affected departments ensures that production-related factors have been considered in the design. The success of … Read more
The main purpose of thermal management is to ensure that all electronic components, especially BGA, are maintained within their functional and maximum allowable limits. The functional temperature limit defines the range of environmental temperatures or component package temperatures that allow electronic circuits to operate normally. It is essential to understand the cooling technologies that the … Read more
Reflow Soldering Reflow soldering is an important soldering technology in the field of electronic manufacturing, primarily used to solder surface mount devices (SMD) onto printed circuit boards (PCB). The basic principle of reflow soldering: The core principle of reflow soldering is to re-melt the solder paste (a mixture of solder and flux) that is pre-distributed … Read more
1. Price Secrets: The Triple Game Behind Every Gram of Silver In April 2025, the silver paste recycling market in Beijing showed a “polarized” pattern: Photovoltaic silver paste waste (containing 80%-95% silver): real-time price of 6.8-7.2 yuan / gram, up 22% compared to the same period last year, mainly driven by the explosive growth in … Read more
1. Brain-Piercing Electrical Fault Effects Last week, while using video editing software to create an unboxing video for a digital product, I had a sudden idea to adjust the charging cable footage to create a signal interference effect. The operation is simpler than cooking instant noodles: 1. Import any material (even a video of your … Read more
Considerations for Renovating Old Electrical Circuits It is necessary to replace all wiring with copper core; partial modifications are not recommended; Old aluminum wiring within walls is prone to oxidation and overheating, posing hidden dangers; Old air switches should be replaced with new models with leakage protection; Increase the number of sockets to avoid overloading … Read more
The role of the FAI first article tester is to conduct comprehensive testing on the first product produced before mass production begins, ensuring it meets quality standards before large-scale manufacturing starts. This mechanism effectively reduces the risk of incorrect items, lowers the probability of errors, and improves the overall quality of production. Through first article … Read more
From: Michelle’s LabLDM #401: Boeing 747 digital fuel quantity indicator – teardown, reverse engineering and testIntroductionInterface DisplayLabel InformationConnectorPinout of the Aviation ConnectorOpening the InstrumentFrom Altera’s CPLD, EPM7160 1MHz Crystal OscillatorPower Board (LT1074)Reverse Engineering: Power SupplyPower SupplyReverse Engineering: Dimmer Circuits0-5V, 400Hz AC Voltage Rectification Comparison 8-bit Sent to CPLDReverse Engineering: ARINC 429 InterfaceOptocoupler (an ARINC 429 … Read more
The basic task of interference immunity design is to ensure that the system or device does not malfunction or lose functionality due to external electromagnetic interference, and does not emit excessive noise interference to avoid affecting the normal operation of other systems or devices. Therefore, improving the system’s interference immunity is also an important aspect … Read more