PCB DFM Review Checklist: Reading the Design First 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…

PCB Design Review Meeting: The Questions Before the Build 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 design review meeting gives you a practical advantage…

PCB DRC Rule Setup: Teaching the Tool 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 DRC rule setup from the perspective of a PCBA factory floor, covering…

3D Printed PCB Prototyping: What It Can Do Printing a circuit instead of etching one has moved from a laboratory demonstration to a practical prototyping method for some applications. The technology works, but its resolution, materials and electrical behaviour differ from a conventional board in ways that decide where it…

Crystal and Oscillator Layout: Load Capacitance and Jitter A crystal oscillating at twenty megahertz is a resonator with a very high quality factor, and it will oscillate at whatever frequency the circuit around it presents. The layout is part of that circuit. How the Oscillator Works The crystal sits in…

Thermal Shock Testing of Plated Holes and Vias on PCBs Thermal shock testing exposes plated holes to repeated changes in temperature and then inspects them for cracks, and it is the standard way to demonstrate that a barrel can survive the assembly process. The test is simple to describe and…

Inductive Proximity Sensor Circuit Design An inductive proximity sensor detects a metal target without touching it, using a coil that generates an alternating magnetic field and a circuit that notices when the field loses energy to a nearby conductor. It works in dust, oil and water where optical sensors fail,…

Placement Force and Z-Axis Control on SMT Placement Machines Placement accuracy is usually discussed in the X and Y directions, because that is what vision systems measure. The Z-axis, which controls how far the nozzle travels down and how hard it presses, receives far less attention and causes a surprising…

PCB Audio Circuit Layout: Keeping Analog Quiet Audio is usually the last subsystem to receive attention on a dense board and the first that a user notices. A receiver that hisses, a headphone output that clicks when the radio transmits or a speaker that distorts at high volume are layout…

Ultrasonic Sensor Interface Circuit Design An ultrasonic sensor measures distance by timing how long a burst of sound takes to travel out and back, which means the electronics has to do two quite different jobs. It has to drive a transducer with enough energy to produce a detectable echo, and…