Bare Board Test: Finding Opens and Shorts Before Assembly A bare board is tested before any component is placed on it, and the purpose is to catch the faults that fabrication can produce: a broken trace, a short between two nets, a missing connection to an inner layer. Finding them…

LIN Bus Transceiver Circuit Design A LIN bus is a low speed single wire network used inside a vehicle, mostly to connect switches, sensors and small actuators to a body controller. The transceiver is the interface between the protocol controller and the wire, and it has to survive the electrical…

Cellular Module Board Design for Connected Products A product that connects over a mobile network carries a radio transmitter and a power amplifier on the same board as its logic. Cellular module board design is mostly about the supply, the antenna and the certification, because the radio itself is inside…

SMT Changeover and First Article Discipline A surface mount line produces a mixture of products, and every change from one to the next is an opportunity for an error. The stencil, the feeders, the program and the profile all have to change together, and a single item left behind produces…

Troubleshooting: Key Checks Before Release Troubleshooting a reflow defect is easy when the cause is obvious and slow when it is not. A structured sequence keeps the investigation from moving to the least likely cause first, which is usually where time is lost. Start With the Defect Class The class…

Wire Harness: Preparation, Placement and Process Control Where a wire harness meets a board, the electrical connection is only half of the problem. The harness is a mechanical object with mass, stiffness, and a routing path, and every movement of the product, every thermal cycle, and every pull on the…

Drop Test: Preparation, Placement and Process Control Dropping a product is one of the most severe mechanical events it can experience, and it happens in a fraction of a second. The acceleration involved can exceed a thousand times gravity, and the whole event is over before any protection circuit could…

PCB Stencil Defects: From Design to Repeatable Production 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 stencil defects gives you a practical advantage when you…

PCB Stencil Standards: From Design to Repeatable Production Electronics manufacturing has become a discipline of small details. Solder paste volumes, placement accuracy, temperature profiles and inspection limits all add up to the final result. This guide looks at PCB stencil standards from the perspective of a PCBA factory floor, covering…

PCB Stencil Training: Design, Process, and Quality Notes Electronics manufacturing has become a discipline of small details. Solder paste volumes, placement accuracy, temperature profiles and inspection limits all add up to the final result. This guide looks at PCB stencil training from the perspective of a PCBA factory floor, covering…