printed circuit boards - définition. Qu'est-ce que printed circuit boards
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Qu'est-ce (qui) est printed circuit boards - définition

BOARD TO SUPPORT AND CONNECT ELECTRONIC COMPONENTS
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  • via]], visible as a bright copper-colored band running between the top and bottom layers of the board.
  • A cordwood module
  • The two processing methods used to produce a double-sided PWB with plated-through holes
  • An example of hand-drawn etched traces on a PCB
  • Cordwood construction was used in [[proximity fuze]]s.
  • Proximity fuze Mark 53 production line 1944
  • Eyelets (hollow)
  • vias]] (the through-hole paths to the other surface), and some electronic components mounted using through-hole mounting
  • A PCB as a design on a computer (left) and realized as a board assembly populated with components (right). The board is double sided, with through-hole plating, green solder resist and a white legend. Both surface mount and through-hole components have been used.
  • A board designed in 1967; the sweeping curves in the traces are evidence of freehand design using adhesive tape
  • PCB of a DVD player. PCBs may be made in other colors.
  • PCB with test connection pads

printed circuit board         
<hardware> (PCB) A thin board to which electronic components are fixed by solder. Component leads and integrated circuit pins may pass through holes ("vias") in the board or they may be surface mounted, in which case no holes are required (though they may still be used to connect different layers). The simplest kind of PCB has components and wires on one side and interconnections (the printed circuit) on the other. PCBs may have components mounted on both sides and may have many internal layers, allowing more connections to fit in the same board area. Boards with internal conductor layers usually have "plated-through holes" to improve the electrical connection to the internal layers. The connections are metal strips (usually copper). The pattern of connections is often produced using photo-resist and acid etching. Boards, especially those for high frequency circuits such as modern microprocessors, usually have one or more "ground planes" and "power planes" which are large areas of copper for greater current carrying ability. A computer or other electronic system might be built from several PCBs, e.g. processor, memory, graphics controller, disk controller etc. These boards might all plug into a motherboard or backplane or be connected by a {ribbon cable}. (1995-05-01)
printed circuit board         
(printed circuit boards)
A printed circuit board is an electronic circuit in which some of the parts and connections consist of thin metal lines and shapes on a thin board. (TECHNICAL)
N-COUNT
Printed circuit board         
A printed circuit board (PCB; also printed wiring board or PWB) is a medium used in electrical and electronic engineering to connect electronic components to one another in a controlled manner. It takes the form of a laminated sandwich structure of conductive and insulating layers: each of the conductive layers is designed with an artwork pattern of traces, planes and other features (similar to wires on a flat surface) etched from one or more sheet layers of copper laminated onto and/or between sheet layers of a non-conductive substrate.

Wikipédia

Printed circuit board

A printed circuit board (PCB; also printed wiring board or PWB) is a medium used in electrical and electronic engineering to connect electronic components to one another in a controlled manner. It takes the form of a laminated sandwich structure of conductive and insulating layers: each of the conductive layers is designed with an artwork pattern of traces, planes and other features (similar to wires on a flat surface) etched from one or more sheet layers of copper laminated onto and/or between sheet layers of a non-conductive substrate. Electrical components may be fixed to conductive pads on the outer layers in the shape designed to accept the component's terminals, generally by means of soldering, to both electrically connect and mechanically fasten them to it. Another manufacturing process adds vias: plated-through holes that allow interconnections between layers.

Printed circuit boards are used in nearly all electronic products. 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. Electronic design automation 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 has to be done only 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 and is estimated to reach $79 billion by 2024.

Exemples du corpus de texte pour printed circuit boards
1. In addition, the printed circuit boards, as well as power supply and riser card, are halogen–free.
2. E–waste generally consists of obsolete devices such as DVDs, CDs, floppies, tapes and electronic components including chips, processors, mother boards, printed circuit boards and industrial electronics.
3. The Israeli manufacturer of inspection equipment for printed circuit boards, flat panel displays and other electronics announced yesterday it is buying all the shares of the U.S. producer of test equipment for LCD screens. (Shmuel Shuster) Higher interest rates will raise auto leasing prices by up to 10%, because leasing companies finance their purchases of new vehicles primarily through large loans.
4. Paul Jackson, engineering manager at Axis, said÷ "Even though we will continue to support a lead–containing process long into the future we would suffer as a business if we are not able to offer lead–free products as well and advise our customers properly." Graphic, a company that makes printed circuit boards for electronics, has also changed its processes.