Smart Speaker PCB and PCBA Design Notes What Is Inside a Smart Speaker A smart speaker packs an audio system, a radio, a microphone array, and a processor into a small enclosure. The main board carries the system-on-chip that runs the assistant, a codec for analog conversion, a class-D amplifier,…

AS9100 for Aerospace PCB Manufacturing What AS9100 Is AS9100 is the quality management system standard for the aerospace, space, and defence industries. It is built on ISO 9001, which means it contains everything that standard requires, and it adds the requirements that the aerospace supply chain found it needed on…

Smart Agriculture PCB: Design for Harsh Outdoor Deployment What These Boards Have to Survive Agricultural electronics are deployed where consumer electronics are never expected to go. A soil sensor sits in wet ground for years, an irrigation controller is mounted on a post beside a field, and a livestock tracker…

Spectrum Analyzer PCB: RF Design and Manufacturing Why the Board Sets the Noise Floor In a spectrum analyzer, the printed circuit board is not a passive carrier for the design. At gigahertz frequencies the geometry of a trace is part of the circuit: its width sets the impedance, its length…

Ceramic PCB Manufacturing: Materials, Processes and Cost Why Ceramic Instead of FR-4 Ceramic substrates exist because laminate hits a wall on three fronts at once. Thermal conductivity of FR-4 is around 0.3 watts per metre-kelvin, its dielectric strength is modest compared with a ceramic, and its coefficient of thermal expansion…

Power Plane Design in Multilayer PCBs What a Power Plane Is A power plane is a continuous layer of copper inside a multilayer board dedicated to one supply voltage. Instead of routing a supply net as a trace from one part of the board to another, the designer assigns an…

Medical Electronics PCB: Design and Manufacturing Requirements What Sets Medical Boards Apart A medical board is not defined by a special material or a unique manufacturing step. It is defined by consequence and by oversight. The equipment runs continuously for years, it is often attached to a patient, and its…

Safety-Critical PCB Manufacturing: Standards and Process What Makes a Board Safety Critical A safety-critical board is one whose failure can injure a person, destroy equipment, or interrupt something that other people depend on. The definition is about consequence rather than about technology, which is why an ordinary-looking four-layer controller in…

IPC Standards for PCB Design and Manufacturing What IPC Is IPC is the industry association that writes the standards the electronics manufacturing world works to. Its full name, IPC Association Connecting Electronics Industries, reflects the role it has held since 1957: bringing fabricators, assemblers, equipment makers, and their customers onto…

Black FR4 PCB: Material, Solder Mask and Manufacturing Notes What Black FR4 Actually Means Black FR4 is an ordinary glass-reinforced epoxy board wearing a black solder mask. The laminate underneath is the same FR-4 that green boards use, and the electrical performance of the two is essentially identical. The colour…