Abstract

Polychlorinated biphenyls (PCBs) are a family of aromatic compounds consisting of a biphenyl molecule which has been chlorinated to form a large number of possible congeners. The number of chlorine atoms they can contain (from 1 to 10) varies, as does the placement of the chlorine atoms on the biphenyl molecule. Thus, a polychlorinated biphenyl is one of 209 compounds having the formula: C12H10–nCln. Due to their excellent heat stability, fire retardance and electrical insulating properties, they gained widespread use as dielectric fluid incorporated in electrical transformers and capacitors. They were also incorporated in products as various as plastics, hydraulic fluids, surface coatings, inks, paints, pesticides, lubricants, and carbonless copy paper.

Printed Circuit Board (PCB) First Article Assembly

Bittele Electronics offers printed circuit board (PCB) first article assembly at the most reasonable prices than any other electronic contract manufacturers. The most significant step for successful layout designing of the PCB is the first article approval of circuit board by the client. As the approved first article circuit board resolves most of the queries pertaining to fabrication, PCB assembling and its testing. We provide first article assembly for different technology boards.

We have engaged our expert team to cater to the customer needs for varied technologies such as we have an ability to handle extra-large through-hole circuit board, Surface-mount and mixed-technology PCBs. We offer superior quality along with fast response for any PCB assembly related queries. On final decision of a technology, further cost can be decided with us.

So as to benefit the customers, Bittele’s first article assembly service offers the most suitable cost structure for reducing the prototyping costs. Our staff puts their extensive knowledge to serve every client by giving necessary ideas and suggestions on design to improve the manufacturing process as an additional way to reduce costs and proceed for placement of order.

We as the most efficient electronic contract manufactures accepts orders through various channels i.e. the orders can be placed via email, on telephone or through our respective website with a specific details for first article assembly. Furthermore, the instant online quote tool for PCB assembly can be used to get the idea of the pricing of PCB assembly and get information pertaining to inspection methods adopted.

The first article circuit board assembly process is the significant step. Even a small error in assembly machine setup will lead to multiplication of errors in all circuit boards of current work order. Hence the use of stringent quality inspection techniques plays a pivotal role to get the required first article assembled. Our engineers are well trained to get the PCB on a test bench along with evidence of concept validation. Our inspection monitoring team recurrently supervises the PCB assembly process with demonstrated methods for statistical process control. We use modern techniques such as X-Ray inspection for Leadless & BGA components to check the joint soldering. Automatic Optical Inspection (AOI) is used for verification of solder joints, component placement and orientation, etc. If you need any added information regarding quality methods and shipping charges, you can send an email to sales team at sales@7pcb.com.

Unlike other circuit board assemblers we do not burdened our clients with any additional charges. And this is relevant from the fact that we do not charge any extra prices for quick shipping of first assembled PCB in addition to modification of services.
We avoid charging additional costs for any modification of services for remaining circuit board assembling. Once the customer receives first article PCB assembly boards, it is required to test the boards and inform us about any changes required by preferred communication method. The modifications are done with no additional costs for programming or set-up for circuit board assembly. Different means of communication can be used for further coordination and can also contact us for online quote queries.

For effective end delivery, we coordinate with our customers through various channels by means of our specialized team. We arrange an online teleconference with the client for reviewing the circuit board assembled and discuss the probable changes with respect to Design for Manufacturability (DFM). We also use other communication methods to discuss any assembling issues along with meeting the specific requirements of our clients.

Source "http://blog.7pcb.com/pcb-first-article-assembly/"

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Printed circuit boards (PCBs) have long been the foundation of electrical engineering, serving as the “brains” of any powered device. Designing PCBs is to electrical engineering as HTML is to web development—the backbone that makes it all possible. That’s because no powered device works without a PCB of some sort. From cell phones and remote controls to robotics and toys, PCBs provide electricity and connectivity between the components of a device, allowing it to function the way it was designed.

Here’s a look at what goes into this technology and what you need to know to get started prototyping a PCB for your next embedded system project.

PCBS ON THE RISE: POWERING THE CONNECTED DEVICES OF THE IOT

PCB design has been around for decades, but its relevance is back in the spotlight. They originally came about to answer the need for smaller, more efficient ways to power electronics. In the age of the Internet of Things (IoT) where everyday devices with embedded systems are becoming Internet-connected devices, PCB design is still meeting that need, while growing more advanced, and more in demand.

The IoT has brought us the ability to control everyday objects and devices remotely, from our phones. All of a sudden, household objects are mini-computers, able to be turned on through a mobile app. Wearables track our steps, and smart thermostats track our environments. Cars can monitor themselves, and bridges can sense structural failure. All of this requires hardware, software, and power.

For many of these devices to be “smart,” they need to have PCBs. So what are PCBs exactly, and how are they made? Let’s break down the basics.

WHAT IS A PRINTED CIRCUIT BOARD?
Printed circuit boards are physical components of electronic devices. They’re made up of a board, which is typically resin or plastic, and solder, the conductive metal parts that channel energy, usually made of copper. The solder makes the electrical connections between the PCB and the parts of the device possible. There’s also a silkscreen layer on top of the board that indicates what goes where, like a roadmap.

PCBs don’t just supply power; they also support the mechanics of a device. That’s because they not only route power, they route signals to different components. This is why a PCB acts like the brain of a device—and a device can’t function without it.

A PCB board is usually talked about in terms of how many layers it has, which can be anywhere from one to 10 layers. The more complex a device is the more layers the PCB will have. They can also be single- or double-sided, with copper layers on both sides. The more copper there is for connecting components, the more components you can have–hence, the more complex the device.

To get a PCB designed and manufactured, there are a few steps: schematic design, board design with EDA software, manufacturing, assembly, and testing.
DESIGNING, PRINTING, AND MANUFACTURING A PCB

A PCB design expert can assist you in assembling a top-quality PCB catered to your specific technological needs. A PCB designer will provide an in-depth analysis of your device’s requirements to ensure your product has the support necessary to excel in the competitive tech market. They’ll have access to all of the latest software and are well-versed in the best design strategies.

Once you have a PCB designer and you’ve gotten them up to speed on your project requirements, there are a few steps they’ll go through. Here’s a quick overview of the process.

1. THE SCHEMATIC FOR THE CIRCUIT IS DESIGNED.

First, a designer will create the schematic. A schematic is a crucial step before designing the board itself and should never be overlooked. A schematic is like a roadmap for a circuit, containing a series of symbols that represent aspects of the circuit: switches, resistors, diodes, nodes, and more. This is also helpful later on for troubleshooting any issues with your PCB.

2. USING EDA (OR, ECAD) SOFTWARE, THE BOARD DESIGN IS LAID OUT.

After the circuit design is captured in a schematic, it’s translated into an electronic design automation (EDA) software package like Altium Designer, KiCAD, Eagle, Allegro, or ExpressPCB. The design has to be exported into an industry standard format (e.g., the Gerber format, the default “language” used to describe PCB components). The resulting file acts as a set of instructions for the production phase of a PCB.

3. THE PCB IS PRINTED, FABRICATED, AND ASSEMBLED.

Once you have a Gerber or CAD file, you can manufacture your PCB. The dimensions of the PCB—along with how many layers it will be—are decided, and all of the components are positioned, ground, and laid out, and signal traces dictated by the Gerber file. There are different requirements for different boards, so your PCB designer will be able to tell you whether you need surface mount (SMT), thru-hole, single- or double-sided fabrication, and more.

If you’re looking to rapidly prototype a PCB, using a 3D printer is an efficient way to whip up designs and test them on the fly. Learn more about 3D printing in this article.

4. TEST A PCB FOR FUNCTIONALITY.

Finally, white-box testing will make sure your PCB is structured properly once it’s been fabricated. The goal here is to test every possible output to ensure the PCB is functioning as the designer intended it to. Compared with black box testing, which only tests inputs and outputs without looking at the specifics, white box testing focuses on the each possible pathway of the PCB to make sure there are no failures.

Source"https://www.upwork.com/hiring/design/printed-circuit-board-design/"