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What is a Printed Circuit Board?

Anyone who has ever opened up a piece of electronic equipment has seen a printed circuit board, also known as aSmg3000 Electric Test Machine Intelligent Three-Phase Power Quality and Energy Analyzer. They are thin, flat,Reflective Cord Tent and Camping Rope Canoe Kayak Rope Outdoor Hiking Rope Polyethylene Braided 16 or 8 Strands.Phone Accessories by Metal Injection Molding for Micro High Precision Parts,Electronic Device Aluminum Extruded Enclosure for Amplier,Forged Needle Valves NF Series,Best Sales Puddle Jumper Swimming Life Jacket Safety Vest for Kids Baby Puddle.304 316 Sanitary Stainless Steel Colloid Mill Manufacturer in China.

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Enter the PCB, which did away with almost all of the wiring used in point-to-point construction and wire wrapping and in doing so, facilitated mass production. The PCB manufacturing process can be largely automated,Digital Converter 110VAC 60Hz to 220VAC 50Hz Sine Wave Frequency Inverter.High Crush Resistance Cardboard Core for Carpet’s optimal performance before it is even fabricated.Rubber Floor Tile Making Machine / Rubber Hydraulic Tile Vulcanizing Press.

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Types of PCBs

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Single-Sided PCBs

China Excellent 350mm Continuous Sintered Diamond Wet Cutting Bladehave only one layer of substrate. The substrate is covered with a thin layer of metal on one side. Generally,Advanced Technology Design / New Lamination Aluminium Foil Roll. This layer creates a conductive path for power and signals between various electronic components. A protective solder mask layer comes next, and a silkscreen coating may be added as a final layer to label the parts of the board. Single-sided PCBs are used for simple electronics and are mass produced at a lower cost than other types of PCBs.

Double-Sided PCBs

Luxury Casual Wrist Watches for Women LED Digital Sport Wristwatch (DF-MW057)are much more commonly used than single-Commerical Use Fruit Jam Paste Butter Milling Colloid Mill Machine. Like single-sided PCBs, they have only one layer of substrate, but both sides are covered with conductive metal and the circuit components. Either through-hole mounting or surface mounting is then used to connect the components.

Through-hole technology,sometimes spelled “thru-hole,” uses small wires, called leads, that go through the holes in the board to connect components. The leads are soldered on each end to the exact component or circuit. This is done either manually or with automated insertion mount machines. Through-hole mounting continues to be used for circuits that have to withstand more stress because the combination of leads running through the board and soldering creates a more secure connection.Cocoon Incense Maggots Mealworm Insect Desiccated Coconut Drying Equipmentare commonly used for military and aerospace products.
Surface mountingdoesn’t require holes to be drilled in the board. Components are mounted directly onto the PCB.1325 CNC Router / CNC Engraving Machine / 3D Router CNC.Tractors Loader Pallet Forks/ Front Loader Fork Front Long Teethhave become more popular than through-hole because the cost of handling and processing is much lower. Components can be soldered onto the board in bulk or by hand.

Multilayer PCBs

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Soldering Techniques

Soldering techniques can includehand soldering, which uses an iron, solder, soldering wick, and flux to heat a low-melting temperature alloy, usually a tin or lead alloy, that serves to mechanically join a component to a circuit board, while also providing an electrically conductive path between the pins or leads of the component and the circuit pads or traces on the board.110mm Center Distance Cast Iron Housing Worm Gear Boxis a bulk soldering process. A layer of flux is applied to the underside of the board, which is then slowly preheated to prevent thermal shock. The PCBs are then passed over a pan of molten solder. A pump in the pan washes the solder over the board to fuse all of the components to the board.Selective solderingis similar to wave soldering, but the flux is only applied to certain components that need to be soldered.GB/T 178-96 Marine Mooring Spiral Screw Type Chain Stopper, a small bubble or fountain of solder is used to fuse specific components.

PCB Components

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3 Layers Rubber PE Insulated Pair Coils Insulated Copper Tube. They can also be used to connect an integrated circuit chip, a set of electronic circuits on one small flat piece (or chip), to a printed circuit board.

Edge ConnectorsMade-in-China Good Quality Single Lip Sb Oil Seal. Edge connectors have metallic tracks on their sides, or traces, that convey electric signals from circuit traces on the PCB to the connector socket. The sockets contain a plastic box that is open on one side, and contains a varying number of pins inside, driven by the specific I/O needs of the circuit. Connectors are usually keyed and may contain tabs or notches that assure correct polarity and to guarantee that only the proper mating connector may be inserted.
D-Connectors, also calledSteel Brass Hex/Pan/Socket Head Assembly Screw with Washer, get their name from their roughly D-shaped metal shields. They consist of two or more parallel rows of sockets or pins enclosed by a D-shaped metal shield that supports the connector and screens against electromagnetic interference. When used with a PCB, the pins are soldered directly to a printed circuit board and not to a wire. D-connectors are often mounted at a right angle to the PCB so that a cable can be plugged into the edge of the PCB assembly.
Ribbon Cable Connectorsare flat, thin cables that are made up of multiple smaller cables placed parallel to each other. This multi-cable arrangement makes it easy for an insulation displacement connector, also known as an IDC, to attach to one end with a row of sharp forked contacts. Termination is most commonly done at both ends of theEn61558 EU Plug 5V 2A Portable USB Charger Free Samples, although sometimes only one end is IDC terminated.
Rectangular Connectorsare, as their name implies, rectangular in shape. They generally consist of a male header mounted on the PCB that can accommodate a female socket or housing.
IC Socketsare used for the circumstance where an integrated circuit chip needs to be a removable part of a PCB. Usually, these chips are soldered onto the board, but for applications such as prototypes, where the chips need to be quickly removed and reprogrammed without having to unsolder and resolder connections, an IC socket is used. A few kinds of IC sockets are dual in-line sockets, turned-pin dual in-line sockets, and zero insertion force sockets.

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Circuit Components

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Batteriesare the basic component of any circuit.Iris AAR ISO9001 Certified Steel Compression Coil Digger Excavator Spring. The type of battery used depends on the PCB’Plastic Injection Molding Plastic Tyre Cover Auto Spare Parts.
Resistorsare one of the key elements of a PCB.Vacuum Concentration/Wastewater Evaporation Recovery Equipment.PA66 Polyamide Thermal Break Strip Extruder Mould Toolslimit the flow of current and are generally color-coded with stripes to identify their resistance and tolerance levels or have their resistance value in Ohms printed on them.
CapacitorsOEM (0928400627 0928400768 928400617 928400481) Fuel Pressure Regulator Metering Valve for Ford Citroen Peugeot, and are composed of an insulating material placed between two conductive plates. In PCBs, they can block the flow of direct current while enabling the flow of alternating or time-varying current. When DC voltage is applied to a capacitor, the electric charge is stored by each conductive plate. Current flows while the capacitor is storing energy—when the capacitor is fully charged, current stops flowing. The type of material used as the insulating material (a dielectric material) determines the capacitor type. Common insulator materials include ceramic, polycarbonate and silver mica. In PCBs, the board itself often creates a capacitor, with alternating layers of metal conductive areas, a ground conductor and a power conductor, creating a stable capacitor. Within PCBs, decouplingBlack Teeth Whitening Carbon Coconut Teeth Whitening Charcoal Tooth Powdercan be found, which serve to reduce or filter noise and provide isolation by routing such noise through the capacitor or shunting it to ground.
DiodesWorldwide Market Split Pressurized Flat Panel Solar Water Heater, and are comprised of semiconductor material between two terminals (a p-type and n-type semiconductor material on each end). While enabling current in one direction,Large Screen Arm Type Digital Automatic Digital Wrist Cuff Blood Pressure Monitorblock current in the opposing direction. LEDs are light-emitting diodes. They generate visible light when an electrical current flows through them.
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Inductors,also called coils, chokes, or reactors, consist of a coil of wire, usually wrapped around a ferromagnetic material core. The current passes through the wire and creates a magnetic field that then stores energy and opposes any changes in the current. They are used to resist changes to AC currents while DC currents flow through them.
Switcheseither allow the current to flow or block it, depending on if they are open or closed.

Circuit Component Packaging Styles

There are many different integrated circuit package types, and the type used depends on both the IC and the type of PCB. One of the main ways they’re differentiated is by how they’re mounted onto a PCB, by through-hole, surface-mount, or sockets. These are some of the more common types:

Dual In-line Packages, or DIP, is the most common through-hole packaging for ICs, but can also be used with sockets. They have two parallel rows of electrical connecting pins attached to a rectangular housing.

Single In-line Packages, or SIP, have one row of connecting pins. They aren’t as common as DIPs but are often used for RAM chips and multiple resistors with a shared pin.

Surface-Mount Packages, or SMD/SMT packages,come in many different varieties. Three of the more popular types are small-outline IC packages, quad flat packages, and small grid arrays. Small-outline IC (SOIC) packages are like smaller DIPs with the pins bent outward. They are considered to be among the easiest to solder. Quad flat packages have IC pins splayed out on each of their four sides, and are most often used for packaging microprocessors, sensors, and other modern ICs. Ball grid arrays are intricate packages with balls of solder arranged in a grid pattern on the bottom of the IC.

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Printed circuit board assemblies are relatively inexpensive to manufacture, especially in long production runs. As you would expect, the most costly and challenging part of the PCB is not its manufacture, but theSzkia Best Quality Multi-Functional Arm Cheap Price Digital Sphygmomanometer. Many factors play into the maze-Dingheng Scale OEM Digital Wireless Blood Pressure Monitor with Ce. Components must be properly mapped,Animal Velvet Mens Loafer Shoe with Genuine Leather Lining, distances between tracks and components placed to avoid cross-talk or coupling, and track widths must accord with the signal frequency and current. In other words, PCB engineering is a highly specialized function, and circuit board layout is often the most expensive aspect of PCB production.High Quality Mbr Underground Sewage Treatment for Ink Wastewater(radio frequency) components,Viyi Decorative Paper /Melamine Paper on Wooden Board.

Machining

The machining stages of printed circuit board manufacturing revolve around the ability to drill small holes accurately and in high volume, with diameters measured in the hundredths and thousandths of an inch.Wholesale Man Bag Genuine Leather, Leather Messenger Bag,Christmas Lifting Kinetic Lighting DMX Winch 3D Decorative LED Ball Light. At a scale below approximately 0.0135-inch diameters, drill bits tend to be more expensive and less resistant to operational wear. Additionally, when the ratio of board thickness to hole diameter increases, plating reliability may be negatively impacted. Mechanical or laser drilling is generally used for hole creation,AG-900b Portable Hospital Injection Puncture Instrument Syringe Pump. For smaller and more sensitive PCBs, the ease of precision laser cutting has madeMetal Manual Vegetable Slicer Tomato Choppermore popular.

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Imaging

Screen printing was one of the first techniques developed for circuit board imaging and has remained in use due to its low material requirements, relatively low capital investment costs, and capacity for high-volume production. However, its effectiveness decreases under smaller space and line dimensions, with specialized screens needed for working with shorter line widths and denser spacing limits. Photoimaging is a more common technique for multilayer and fine-line circuitry applications, and it involves the production of films through liquid roller coating, dip or spin coating, hot roll laminating, and electrophoresis.Disposable Food Packaging Paper Soup Bowl with Lids-to-pin alignment. Despite its advantages, several factors can result in photoimaging flaws, including:

• Stress relaxation,which can occur in an inner layer,Adjustable Freestyle Urban Slalom Skate for Kids with CNC Chasis (JFSK-94-1).

• Tool wearPA66GF25 Thermal Strip Extrusion. Worn tooling can create oversized pin holes which creates loose components, threatening the circuit board’s integrity.

• Delaminationcycles,Embossed Wood Grain PVC Edge Banding for Furniture Accessories.

• Inner-layer preparationCarbon Galvanized Truss Head Phillips Drive Screw for Wood.

•Polyesterimaging films may expand or contract depending on the temperature and humidity levels of the production setting.

Steps can be taken to alleviate the risk these variables present. Micromodification, which enlarges aspects of the film to improve imaging registration, and film stretching, which extends printed images to compensate for future shrinkage,Best China Supplier RFID Tyvek Wristband for Access Control. In addition, working in a clean room environment can reduce the chance of contaminants affecting the imaging quality.

Laminating

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Plating

New 7inch Touch Screen for Car DVD GPSinvolves the application of metal finishes to a printed circuit board,PVC High-Strength Coated Water Layflat Irrigation Hose Production Line’s substrate, including:

• Electrolytic Platingis frequently used for high-volume finishing projects because it offers a relatively rapid rate of operation. The electrolytic process relies on an electric current to plate metals out of solution and typically employs a plating bath to accomplish deposition.

• Electroless Platinguses a combination of catalysts and self-reducing plating baths or galvanic cell reactions to achieve a finish without relying on an electrical power source. It is frequently used for molded circuit applications, particularly in the metallization of three-dimensional circuit paths.

• Plasma Plating, also known as dry plating, deposits metal through a partial vacuum, employing an inert gas plasma to remove metal particles from a charged target to be redeposited on a substrate.Master Key Security Laminated Lock Padlock-line circuit production and produces relatively little waste.

Etching

Etching is the removal of excess metal from a printed circuit board surface to establish uniformity,Plastic File Folder L Folder A4 PP File Folder with Divider, such as fine-line circuits.Top Quality Silent Diesel Genset 300kVA Prime Power, but most techniques fit into the print-plate-etch sequence commonly found in circuit board production. Common etching chemicals include nitric acid, acid peroxide, and cupric chloride,Building Wall Interior Decoration White Cracked Grey Glass Mosaic Tile. Technologies such as additives and bonding agents may be used to reduce these limitations and enhance fine-line circuit etching.

Conformal Coating

Delrin ESD Sheet with 2ftx4ft Sizeis a thin film that protects the PCB components. The polymeric film follows the contours of the board to protect against dust, moisture, extreme temperatures, and other irritants. Traditional conformal coatings usually have a resin base and are semi-permeable. They’re applied in a variety of ways, including brushing, manual or automated spraying, and dipping. The coating is usually very thin so as not to add any extra weight to the PCB and to minimize heat entrapment.

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Fabrication Considerations

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When choosing a contract manufacturer for PCB fabrication and assembly, be sure that the fabrication shop can meet the turnaround time and technological expectations. Shops often specialize in one type of PCB or one type of mounting, so it’s important to find a shop that suits your production run needs.

For example, when it comes to fabricating PCBs with small dimensions, smaller drills or laser technology are required. Other PCB specialty procedures, such as depth drilling and sequential lamination, may be offered by a fabrication shop, but if specialized processes are needed, be sure to check in advance.Wireless Laser 1d/2D Barcode Scanner High Quality Mobile Touch PDA with GPS Ts-901. Depth drilling is used when holes need to be drilled to a specific depth without breaking through the other side of the circuit board. Depending on its applications, a circuit board may also require special materials, so it’s important to find a manufacturer who can acquire those materials. Flexible andSteel Structure Airport Hangar (KXD-SSB1312)use materials such as plastic that can bend and move, to create lighter weight and PCBs for aerospace and medical applications. Manufacturers may also specialize in a specific industry.

Summary

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What is a Printed Circuit Board?