Autre

:PCB placement checklist: 13 review points covering cabling, component clearance, thermal spacing, cooling, signal routing, interference, mechanical strength.

:PCB fabrication anti-pollution measures: wastewater, exhaust gas, waste residue, 24-hour monitoring, 60% water reuse, and zero Cu-Etchant discharge.

:PCB board pollution: wastewater contaminants (copper, organic matter, ammonia, COD 10-20g/L), marine bioaccumulation, and environmental treatment trends.

:High-speed PCB hole design: blind, buried, through-hole types, impedance discontinuity, signal reflection, and 5 layout guidelines for reducing parasitics.

:PCB copy processing manual: scanning, component demounting and BOM, soldering temperature, image conversion, and copper thickness measurement.

:PCB layout modes: right-angled (avoid in high-speed), differential (anti-interference, length matching), and S-shaped (delay adjustment, timing retention).

:PCB reverse engineering process: obtaining schematics and BOM, 5-step workflow, secondary development, new product design, and breaking technical barriers.

:China PCB industry: output value ranking, key challenges (standards, brands, R&D, environmental), and growth drivers from 3G and government stimulus.

:Rigid-flex PCB: materials (FR4, PI, PET, epoxy), advantages, applications in folding phones, cameras, automotive, and global industry distribution.

:Flexible PCB classification: single-sided, double-sided, multilayer, plastic vs non-plastic, polyimide CCL, coverlay, and portable electronics applications.

:HDI PCB definition: High Density Interconnector with Microvia, buried vias, sequential lamination, impedance control, and consumer electronics applications.

:Metal core PCB classification: aluminum, copper, iron, silicon steel bases, thermal dissipation, temperature limits, and automotive applications.

:Multilayer PCB construction, advantages (high density, small size, impedance, shielding), disadvantages (cost, cycle time), and high-speed circuit use.

:Three scenarios for outside PCB services: component handoff, partially completed boards, and full outsourcing, plus quality control and PCB testing.

:How to choose a PCB manufacturer: capabilities, experience, credibility, prototyping, and quality standards for PTH and SMT assembly.