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Topic: Printed circuit board

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	Printed Circuit Board Fabrication and Assembly
		These Printed Circuits Boards (PCBs) are exposed to such extreme environments as high radiation, humidity, and cryogenic temperatures in a wide variety of experiments.
		The printed circuit board fabrication group produces custom circuit boards from the engineer’s initial design to the finished board, with the capability to produce features such as fine holes for via structures and components, ultra fine width and pitch conductive circuit traces.
		The circuit board assembly group in Instrumentation is a cost-effective means of assembling specialized custom circuit boards or for performing any kind of rework on existing fixtures or off-the-shelf electronics.
	www.inst.bnl.gov /facilities/pcbfabassy (762 words)

	Printed Circuit Board \| Terminology Glossary
		Edge Connector – is a connector on the circuit substrate edge in the form of plated pads or lines of coated holes used to connect other circuit board or electronic device.
		In-Circuit Test – is the electrical testing of individual components or parts of a circuit board rather than testing the whole circuit.
		Lamination - Many printed circuit boards are made up of multiple layers, these are referred to as multi-layer printed circuit boards.
	www.trianglecircuits.com /pcb-terms.html (972 words)

	Printed Circuit Board-Circuit Board
		Printed Circuit Board-Circuit Board For all kind of Printed Circuit Boards and Printed Wiring Boards.
		Printed Circuit Board-Circuit Board Sn-3.5Ag-0.7Cu is the most common alloy in Europe.
		It is often worth purchasing “bare” chips and con-necting them directly to the PCB with bonding wire.
	www.precoplat.com /printed_circuit_board-circuit_board.php (450 words)

	Printed circuit board - Wikipedia, the free encyclopedia
		In electronics, printed circuit boards, or PCBs, are used to mechanically support and electrically connect electronic components using conductive pathways, or traces, etched from copper sheets laminated onto a non-conductive substrate.
		Before printed circuits (and for a while after their invention), point-to-point construction was used.
		PCBs designed for use in vacuum or in zero gravity, as in spacecraft, being unable to rely on convection cooling, often have thick copper or aluminum cores to dissipate heat from electrical components.
	en.wikipedia.org /wiki/Printed_circuit_board (3739 words)

	PRINTED CIRCUIT BOARD RECYCLING
		Printed circuit boards are typically manufactured by laminating dry film on clean copper foil, which is supported on a fiberglass plate matrix.
		Printed circuit boards are potentially a difficult waste material to process since they generally have no usefulness once they are removed from the electrical component in which they were installed.
		The economics of printed circuit board recycling will be determined by many factors, including the characteristics of the boards to be recycled, market value of the reclaimed components/raw materials, volume of boards being recycled, and conditions of the hazardous waste/solid waste market.
	p2library.nfesc.navy.mil /P2_Opportunity_Handbook/2_II_8.html (948 words)

	Wikinfo \| Printed circuit board
		The simplest PCB is a layer of copper foil glued to a sheet of plastic, often an epoxy glue reinforced with fibreglass.
		Printed circuits were first used in World War II for rugged radios, but entered commercial use in the 1950s.
		The parts and pads of the PCB are designed so that the surface tension of the molten solder centers the parts on their copper pads.
	www.wikinfo.org /wiki.php?title=Printed_circuit_board (1131 words)

	Printed Circuit Board Manufacturing - Printed Circuit Boards Assembly
		Our PCB factory is principally engaged in the manufacturing of high density single sided, double sided and printed circuit board manufacturing up to 12 layers.
		After the pattern is made on the board by either the screen or pen, the circuit board is bathed in an etching solution.
		A newer process of printed circuit board manufacturing involves ultra-violet light, which sensitizes the areas on the circuit boards not have resist paint on them.
	www.eeurd.com /pages/printed_circuit_board_manufacturing.htm (403 words)

	Printed Circuit Board Assembly
		These printed circuit boards are highly complex with many fine-pitch devices and package types, IC’s on top and bottom, etc. and therefore are difficult to manufacturer with consistently high first-pass assembly yields.
		Printed circuit board assembly of these boards require the stringent control of line set-ups, solder paste application, reflow profiling and other key processes.
		For example, we recently completed a survey and comparative assessment of 16 telecom printed circuit board assembly sites in Mexico, China and SE Asia for a $500 million telecom infrastructure company that showed wide variation in-process yields and other performance factors.
	www.cmcseattle.com /printed_circuit_board_assembly.htm (226 words)

	Printed Circuit Board and Backpanel Fabrication (Site not responding. Last check: )
		Printed circuit boards and backplanes are platforms that connect semiconductors and other electronic components.
		As an industry leader, we have pioneered advances in the manufacture of complex, technologically advanced multi-layered printed circuit boards and custom-designed backpanel assemblies.
		We have the capabilities to produce printed circuit boards with up to 60 layers and circuit track widths as narrow as two mils.
	www.viasystems.com /dynamic_page.asp?page_symbol=pcb_backpanel_fabrication (191 words)

	Printed Circuit Boards Assembly - Printed Circuit Board Manufacturing
		Just trying to follow a circuit, known as a "tracer," along the board can be frustrating enough.
		It did not take long with the hobby version of the printer circuit kit and a resist pen to figure out that we would rather be drawing buildings and landscapes with that pen than drawing a printed circuit boards assembly.
		Our PCB factory is principally engaged in the manufacturing of high density single sided, double sided and printed circuit boards assembly up to 12 layers.
	www.eeurd.com /pages/printed_circuit_boards_assembly.htm (409 words)

	WMA for a Printed Circuit Board Manufacturer (Site not responding. Last check: )
		After etching, the panels are screen printed with a solder mask ink, then cured in a UV oven at 300 degrees F. This mask prevents the solder or "SealBrite" from adhering to undesired areas.
		After UV curing at 300 degrees F, the panels are screen printed with legend in fl ink on the under side of the board to identify circuit components.
		Boards from the punching operations described under Circuit Board Production are micro-etched in a tank with a heated solution (100 degrees F) consisting of sulfuric acid, hydrogen peroxide, and water.
	es.epa.gov /techinfo/research/reduce/rrel516.html (3262 words)

	Kapton Printed Circuit Board PCB Labels. (Site not responding. Last check: )
		Kapton©; bar code labels are commonly stuck to a printed circuit board before soldering to be used for automatic identification.
		The printed circuit board is heated thus activating the flux, melting the solder and bonding the components to the board.
		PCB labels must be carefully selected to meet thermal, chemical and optical requirements.
	www.fairfield-labels.co.uk /Printed_Circuit_Board_Labels.htm (423 words)

	Printed Circuit Board Software
		Print the layout on any PostScript compatible printer, either on regular paper to be photographed for a positive or negative, or on clear film to be used directly as a positive with other Datak products.
		It allows the user to make his schematic circuit into a printed circuit layout file and to use that file to print PC board artwork that is used to produce a finished PC board, solder masks and component side I.D. silk screens.
		PCDATAK circuits may be printed (or copied on a copy machine) directly onto a clear carrier sheet, such as those made for overhead projectors, and then used as a 1:1 "positive" in making a PC board.
	www.oselectronics.com /ose_p53.htm (656 words)

	Electrons - Printed Circuit Board (PCB) HOWTO: An Illustrated Guide
		When creating a PCB using a chemical etchant, you want to protect certain areas of copper from the chemical reaction (to form the pads and signal lines) and let the ferric chloride remove all the metal that remains exposed.
		A simple solution is to print a mirror image of our PCB traces on a material to which the toner will bind only mildly, then heat the material to remelt the toner and get it to stick to the board.
		Printing is fast and smooth and the resulting images are completely free of imperfections and artifacts.
	electrons.psychogenic.com /modules/arms/art/10/PrintedCircuitBoardPCBHOWTOAnIllustratedGuide.php (2643 words)

	Printed circuit board products
		Our presensitized boards are for positive artwork (fl lines on a clear background), this will allow you to copy your layout on clear film and expose the board.
		When the board is exposed through a positive or negative copy of the artwork and developed using a developer, it causes the sensitized covering to harden where the lines are to remain and the unhardened coating can be washed away leaving the hardened coating where copper is to remain.
		The positive system requires the board be exposed through a film with the circuit lines in fl and the area to be removed clear.
	www.gatewayelex.com /printedcir.htm (991 words)

	printed circuit board (Site not responding. Last check: )
		Background: In the manufacturing of printed circuit boards, the unwanted copper is etched away by acid solutions of cupric chloride.
		During the process the volume of solution increases steadily and the copper in the surplus liquor is precipitated as copper oxide and usually landfilled.
		The process development where the excess etchant is pumped to the recovery circuit and the copper is obtained in a recoverable form.
	www.p2pays.org /ref/11/10756.htm (428 words)

	PCB Assembly \| Printed Circuit Board Assembly
		Printed Circuit Board Assembly is a process requiring both innovative manufacturing concepts and flexible technology.
		At VR Industries, our PCB assembly process has been designed to accommodate all types of printed circuit boards, whether they be small, large, single-sided, double-sided, thin, thick, layered, or even requiring mixed technology.
		The result is a printed circuit board assembly that has been manufactured flawlessly according to the standards our customers dictate.
	www.vrindustries.com /services_pcb.html (173 words)

	Robot Room - Making Printed Circuit Boards
		When the circuit is ready for more permanent use, there are several methods of connecting components together that are appropriate for one-time designs in robots.
		Their boards are of higher quality (greater accuracy, plated through holes, and tin coating) than is usually possible to make at home.
		Although you want to cover the entire board with enough heat and pressure, the board edges just seem to be the most difficult to transfer correctly.
	www.robotroom.com /PCB.html (3587 words)

	Circuit Board Printed Circuit Board
		Circuit Board Printed Circuit Board The aperturetable or the explanation of the symbolism of the aperturetable is missing.
		Circuit Board Printed Circuit Board Flying Probe is a variant for an E-test.
		Also, all surrounding solder areas must be clear of component print for at least 250µ or imperfect print and printed solder areas may result.
	www.microcirtec.com /circuit_board_printed_circuit_board.php (505 words)

	WMA for Multilayered Printed Circuit Board Manufacturing (Site not responding. Last check: )
		After the circuit has been developed on each sheet, the multilayered board is produced by stocking the sheets through a bonding process using heat and pressure.
		As in all circuit board manufacture, the processes in this plant are complex, but certain key elements must be described to make the results of a WMAC assessment understandable when they are being summarized.
		Circuit patterns, after being transferred to each layer, are developed by etching unprotected copper from these layers.
	es.epa.gov /techinfo/research/reduce/rrel504.html (1718 words)

	Printed Circuit Board Etching Equipment – PCB Etching Equipment – PCB Milling Machine
		Today, we are the world's largest developer and supplier of PCB etching equipment for advanced electronic interconnect fabrication, with more than 15,000 units in operation.
		Our PCB etching and PCB milling systems are in production seven days a week, yielding over 99% quality printed circuit boards, and we remain uniquely skilled at providing solutions that meet or exceed the electronics industry's accelerating technology and productivity requirements:
		Our facility is outfitted with the latest Chemcut PCB etching and milling machines and staffed with experienced chemists and technicians who will work with you to apply chemical etching to meet your production needs.
	www.chemcut.net /ind-circuit-board.php (296 words)

	Circuitboards . com : Printed Circuit Board Manufacturer
		A protrusion of the Printed Circuit Board edge that is manufactured to a configuration to mate with a receptacle that provides electrical and/or mechanical junction between the Printed Circuit Board and other circuitry.
		A plated-thru hole in a Printed Circuit Board that is used to provide electrical connection between a trace on one side of the Printed Circuit Board to a trace on the other side.
		The alignment of a pad on one side of the Printed Circuit Board (or layers of a multi-layer board) to its mating pad on the opposite side.
	www.circuitboards.com /terms.php3 (651 words)

	Robot Room - Sandwich Printed Circuit Board
		However, a "-" is printed near one of the holes on the board in case you choose a polarized component.
		If you're etching your own board, the crosshairs can be used to align both sheets of the PCB transfer film before ironing them on to each side of the board.
		Molex connectors to allow the board to be removed from the container without having to remove the motors and switches that are connected to the container.
	www.robotroom.com /SandwichPCB.html (2515 words)

	Printed Circuit Board Manufacturing, Flexible circuit boards, rigid circuit boards, membrane switch manufacturing. ...
		Printed Circuit Board Manufacturing, Flexible circuit boards, rigid circuit boards, membrane switch manufacturing.
		Printed circuit boards are used in a wide variety of our other product lines.
		Miller Dial provides PCB (printed circuit board) assistance after design, engineering, life-cycle, and environmental testing, specification writing, and prepares unique manufacturing procedures for each board.
	www.millerdial.com /pc-system-boards.shtml (323 words)

	TechXclusives - Printed Circuit Board Considerations
		At today's high clock rates and fast signal transitions, the PC board performs a vital function in feeding stable supply voltages to the IC and in maintaining signal integrity between devices.
		A multi-layer PC board is a must, with four layers for the simplest circuits, 6 to 12 layers for typical boards.
		A PC board trace must be analyzed as a transmission line.
	www.xilinx.com /xlnx/xweb/xil_tx_display.jsp?sGlobalNavPick=&sSecondaryNavPick=&category=&iLanguageID=1&multPartNum=1&sTechX_ID=pa_printed_circuit (1192 words)

	Printed Circuit Board Glossary
		A PCB Laminate may be manufactured with more than two layers of copper tracks by using a sandwich construction.
		Unless the whole PCB is gold plated before etching, this technique is limited in its application, normally, to pads on the edge of a PCB, as an electrolytic plating bar must be attached to the pads, and then removed part way through the PCB manufacturing process.
		Where the IC die is attached direct to a PCB, and bond out wires from the IC connect directly to PCB lands.
	www.pdcamerica.com /glossary.htm (460 words)

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