Printed circuit board | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-27

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Printed_circuit_board


00:02:36 1 History
00:11:18 2 Overview
00:17:02 3 Characteristics
00:17:11 3.1 Through-hole technology
00:18:55 3.2 Surface-mount technology
00:20:27 3.3 Circuit properties of the PCB
00:21:43 3.4 Materials
00:21:52 3.4.1 RoHS compliant PCB
00:22:34 3.4.2 Laminates
00:25:32 3.4.3 Key substrate parameters
00:30:45 3.4.4 Common substrates
00:35:35 3.4.5 Copper thickness
00:37:01 3.4.6 Safety certification (US)
00:37:36 4 Design
00:40:11 5 Manufacturing
00:40:26 5.1 PCB CAM
00:41:18 5.2 Panelization
00:42:53 5.3 Copper patterning
00:44:55 5.3.1 Large volume
00:45:13 5.3.2 Small volume
00:45:41 5.3.3 Hobbyist
00:46:12 5.4 Subtractive, additive and semi-additive processes
00:48:26 5.5 Chemical etching
00:51:02 5.6 Lamination
00:52:20 5.7 Drilling
00:55:23 5.8 Plating and coating
00:59:04 5.9 Solder resist application
01:00:13 5.10 Silkscreen printing
01:01:12 5.11 Bare-board test
01:02:26 5.12 Assembly
01:07:44 5.13 Protection and packaging
01:09:33 6 Cordwood construction
01:11:36 7 Multiwire boards
01:13:12 8 See also



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SUMMARY
=======
A printed circuit board (PCB) mechanically supports and electrically connects electronic components or electrical components using conductive tracks, pads and other features etched from one or more sheet layers of copper laminated onto and/or between sheet layers of a non-conductive substrate. Components are generally soldered onto the PCB to both electrically connect and mechanically fasten them to it.
Printed circuit boards are used in all but the simplest electronic products. They are also used in some electrical products, such as passive switch boxes.
Alternatives to PCBs include wire wrap and point-to-point construction, both once popular but now rarely used. PCBs require additional design effort to lay out the circuit, but manufacturing and assembly can be automated. Specialized CAD software is available to do much of the work of layout. Mass-producing circuits with PCBs is cheaper and faster than with other wiring methods, as components are mounted and wired in one operation.  Large numbers of PCBs can be fabricated at the same time, and the layout only has to be done once.  PCBs can also be made manually in small quantities, with reduced benefits.
PCBs can be single-sided (one copper layer), double-sided (two copper layers on both sides of one substrate layer), or multi-layer (outer and inner layers of copper, alternating with layers of substrate).  Multi-layer PCBs allow for much higher component density, because circuit traces on the inner layers would otherwise take up surface space between components.  The rise in popularity of multilayer PCBs with more than two, and especially with more than four, copper planes was concurrent with the adoption of surface mount technology.  However, multilayer PCBs make repair, analysis, and field modification of circuits much more difficult and usually impractical.
The world market for bare PCBs exceeded $60.2 billion in 2014. In 2018, the Global Single Sided Printed Circuit Board Market Analysis Report estimated that the PCB market would reach $79 billion by 2024.