PCB Corrosion Under A Coating: Practical Process Controls Modern electronics depend on boards that are assembled correctly the first time. Every product – a phone, a charger, a medical instrument or an industrial controller – relies on thousands of solder joints that must conduct current for years. This article explains…

High-Speed Backplane PCB Design: A Stage-by-Stage Process A backplane is the board everything else plugs into, and it is designed differently from any other board in the system. Its interfaces are defined by the modules it has to connect rather than by its own function, its mechanical envelope is set…

Back Drilling PCB Design: Stub Control for High-Speed Vias A via that runs from the top of a board to the bottom carries signal only for the part of its length that the signal actually needs. The remainder is a copper stub hanging off the trace, and at 25 Gb/s…

Injection Molding Machine Control PCB: Current, Heat and Noise An injection molding machine is a hydraulic press with a temperature problem. Its control board has to sequence the clamp, hold several heating zones along the barrel, drive the servo pumps that meter the melt, and read pressure and temperature signals…

Module Board Design: Partitioning, Interfaces and Shielding A module board is a small circuit that performs one function and connects to the rest of the system through a defined interface. Power modules, display drivers, radio transceivers, sensor front ends and motor controllers are all built this way. The approach reduces…

Hand Soldering on Aluminum Substrate PCBs: Practical Guidance Soldering by hand on an aluminum substrate is not difficult, but it is different from working on FR-4. The metal base pulls heat away from the joint far faster than a glass epoxy board, the dielectric layer underneath the pad has a…

FR-4 vs G-10 Laminate: Flame Retardant and Mechanical Differences FR-4 and G-10 are both glass fabric laminates bonded with epoxy resin, and they are often described as if one were simply a better version of the other. The real difference is narrow and specific: G-10 is the older, non flame…

PCB Area Estimation: How to Size a Board Before Layout The cheapest moment to change a board size is before layout starts. Once the outline, the connectors and the mounting holes are fixed, the enclosure and the mechanical parts are committed as well, and a late realisation that the circuit…

PCB Drop Test for A Product: What Happens When It Falls Buyers and engineers often focus on the finished product and forget the production line behind it. In practice, most field failures can be traced back to process decisions made during assembly. Understanding PCB drop test for a product gives…

Inside a Spectrum Analyzer: Board Design and Shielding A spectrum analyser is an instrument that measures amplitude against frequency, and it does so over an enormous dynamic range. It has to resolve a signal a hundred decibels below the strongest one present, sweep or capture across decades of frequency, and…