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PCB Etch Process Control in Outer Layer Fabrication

By Frank guo
2026年 9月 13日
PCB Assembly
No Comments

PCB Etch Process Control in Outer Layer Fabrication Etching is the step that turns a plated image into copper conductors, and it is the last chance the process has to hold the line width that the design assumed. Controlling the etch process means controlling chemistry, equipment and the steps that…

ESD Damage Investigation and Control Verification

By Frank guo
2026年 9月 13日
PCB Assembly
No Comments

ESD Damage Investigation and Control Verification Electrostatic damage is difficult to prove because the damage is often invisible and the event leaves no record. A device that fails after handling may have been damaged weeks earlier, or it may have been damaged by the test fixture that is now measuring…

Solder Mask Dam And Sliver Defects

By Frank guo
2026年 9月 13日
PCB Assembly
No Comments

Solder Mask Dam And Sliver Defects Solder mask is not a blanket that covers the whole board. It is a patterned layer that has to stop short of every pad that will be soldered, and the strip of mask left between two adjacent pads is called a dam. When that…

Piezoelectric Sensor Vibration Interface

By Frank guo
2026年 9月 13日
PCB Assembly
No Comments

Piezoelectric Sensor Vibration Interface A piezoelectric accelerometer produces a charge proportional to acceleration, and the interface circuit decides what part of that charge survives the trip from the sensor to the electronics. Cable capacitance, insulation resistance and input noise are the three numbers that set the usable range of the…

High Layer Count PCB Fabrication Challenges and Controls

By Frank guo
2026年 9月 13日
PCB Assembly
No Comments

High Layer Count PCB Fabrication Challenges and Controls Boards with ten, twenty or more layers are built on the same principles as a four layer board, but every tolerance that was comfortable at four layers becomes tight. A high layer count pcb concentrates the difficulty in registration, lamination and drilling.…

PCB Footprint Library Naming and Management Practice

By Frank guo
2026年 9月 13日
PCB Assembly
No Comments

PCB Footprint Library Naming and Management Practice Searching a component library by part number looks obvious until the first thousand pad layouts are filed under package names instead. A workable footprint library is organised by the physical package, and that decision shapes how it is named, reviewed and maintained. Footprints…

Microcontroller Clock System Design and Clock Source Selection

By Frank guo
2026年 9月 13日
PCB Assembly
No Comments

Microcontroller Clock System Design and Clock Source Selection Every microcontroller peripheral is timed from the same tree, so the microcontroller clock system design decides start up time, accuracy, power consumption and electromagnetic behaviour at once. The choice of clock source is therefore a system decision rather than a component decision.…

Resolver Interface Circuit Design

By Frank guo
2026年 9月 13日
PCB Assembly
No Comments

Resolver Interface Circuit Design A resolver is a rotating transformer whose two secondary windings report the shaft angle as a pair of amplitude modulated signals. It survives heat, vibration and radiation that would destroy an optical encoder, and in exchange the electronics has to excite it and then recover an…

Digital Clock PCB Design From Schematic to Enclosure

By Frank guo
2026年 9月 13日
PCB Assembly
No Comments

Digital Clock PCB Design From Schematic to Enclosure A clock is one of the classic microcontroller projects, and it is a good example of how much of a digital clock pcb is decided by the display and the enclosure rather than by the firmware. The board has to be readable…

Planar Coil PCB Design for Inductive Sensing and Power

By Frank guo
2026年 9月 13日
PCB Assembly
No Comments

Planar Coil PCB Design for Inductive Sensing and Power Some boards exist to carry components, and some exist to be the component. A planar coil replaces a wound inductor with copper windings etched into the layers, and the reason to do that is repeatability as much as size. What a…

PCB Etch Process Control in Outer Layer Fabrication

ESD Damage Investigation and Control Verification

Solder Mask Dam And Sliver Defects

Piezoelectric Sensor Vibration Interface

High Layer Count PCB Fabrication Challenges and Controls

PCB Footprint Library Naming and Management Practice

Microcontroller Clock System Design and Clock Source Selection

Resolver Interface Circuit Design

Digital Clock PCB Design From Schematic to Enclosure

Planar Coil PCB Design for Inductive Sensing and Power

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