Wonderful PCB Manufacturing Services

As one of the leading printed circuit board manufacturers based in Shenzhen China, Wonderful PCB has been offering world market with quickturn high-quality PCB prototype to production services at a reasonable price for 18 years. To provide customers with more professional and advanced circuits board, we're committed to adhering to the strictest standards during our PCB manufacturing process, we're fully compliant with the ISO 9001 ISO 14001 quality management system. We're capable to provide an instant quotation for your custom PCB. Additionally, we offer PCB making inspirations, PCB layout tips from top PCB design companies and PCB news on our website from time to time. Our customers are satisfied with our fine product quality, on-time delivery, fair pricing and superior service.

Most PCB manufacturers only allow one customer design to be processed per production sheet because of the complex and technical challenges found with different customer's orders. This is expensive because the set-up costs for each sheet manufactured are charged entirely to each client.  Furthermore, daily production schedules change constantly according to demand. Our printed circuit board manufacturing process is completely different from raditional PCB manufacturer’s production processes. We run PCB designs from different customers (but requiring identical technical specifications) on the same sheet and process them together.  The greater the number of different PCBs on a sheet, the lower the set-up cost will be for each client. Manufacturing of different PCB material configurations and specifications are scheduled to run to a weekly timetable, much like a train network. This allows us to plan our capacity and lower our costs through enhanced capacity utilisation and precise scheduling. We have achieved our success by perfecting our fabrication workflow. Our PCB service has been designed for efficiency and low cost.

One of our customers speak highly of us like this: “We choose Wonderful PCB because they offer the entire service from producing the PCB through to ordering parts, assembling and testing. Compared with other manufactures, we appreciate that Wonderful PCB is really communicative during the whole production process. Possible issues are discussed and solved immediately. Hence, we received high quality PCBs with negligible reject rate. In the end Wonderful PCB offers attractive prices, considering the offered services.

“I've using Wonderful PCB for years, and they provided me with good-quality, low-cost PCBs. I used Wonderful PCB to manufacture mobile phone parts, as well as some research developments for some projects. In all this cases, they offered very competitive prices, as well as good quality. They always have met my requirements and deadlines. Also they have been very helpful, supportive and responsive, when some problems appeared in our designs. Finally, last year I used their PCB assembly service for first time, and they operated smoothly in a short time, at a very cheap price” another customer said.

The relevant knowledge of PCB

1. The raw materials

 

At the beginning of the 20th century to the late 1940 s, is the infancy of the PCB substrate material industry development. It mainly displays in: the development characteristic of this period with the resin substrate material, reinforced material and insulating substrate, get a preliminary exploration on technology. These are the most typical substrate material for printed circuit board, copper clad with the advent of development, create the necessary conditions. On the other hand, in order to foil etching method (subtraction method) manufacturing circuit PCB manufacturing technology for the mainstream, the initial establishment and development. It is copper clad on the determination of the structure, characteristic, has played a decisive role.

 

2. polychlorinated biphenyl

 

PCB polychlorinated biphenyls (PCBS) in 1929 until the late 70 s north American business using a synthetic organic compounds, while Canada not the chemical processing production, but also has been widely used in electrical equipment insulation, heat exchangers, water systems and other special applications.

 

After decades after people realize the polychlorinated biphenyls (PCBS) on the global environment pollution, which is a mixture of various chlorinated biphenyl, has a great harm to human body. The Canadian government has taken measures to try to eliminate the PCB, but happened in Canada in 1977 illegal import, processing and sales of the phenomenon of PCB, and the PCB in 1985 illegal released into the natural environment, and the Canadian constitution allows owners continue to use the PCB equipment until the life period of equipment. Canada since 1988, the provincial government began for PCB storage, transportation and destruction of the rules.

 

PCB is not easy to break down in a natural environment, but also spread very far, PCB in production and processing, use, transport and waste disposal process into the air, soil and river and sea, small Marine organisms and fish breathe to PCB, and they have become great Marine food, as a result, PCB went into the body of the all sea life, including mammals of Marine biology. The accumulation of PCB in the Marine organism far beyond it in the water content, almost is the number of thousands of times.

the article from: The relevant knowledge of PCB

Rules on PCB construction

Today, let’s introduce primary knowledge on PCB. Here suggest some rules on PCB construction. Mostly are about the information on SMD and DIP assembly.

1. About SMD assembly

In SMD assembly, we must pay attention to the mininum gap between components (capacitors, resistors and IC chips). Usually, we suggest the best gap between independant component and IC chip is 0.5-0.7mm. But, the gap may change according to the configuration of fixture.

2. About DIP assembly

If in DIP assembly, the gap between resistors is 1-3mm, which is wider than SMD assembly. What needs to notice is to make sure enough gap in DIP assembly. Thinking of difficulties of assembly process, nowadays seldom use DIP technology.

3. About the place of decoupling capacitor

Around power port of IC will need to place an decoupling capacitor. The decoupling capacitor should try best near the power port. When a chip have several power ports, each power ports should have a decoupling capacitor.　

4. Independent component on the edge of PCB

Normally, PCB is delivered by panel. So components on the edge of PCB should comply with two rules. The first one is to parallel V-CUT direction. The second is should keep specified gap from the edge, so that to avoid damage on components when making V-CUT.

5. If connect two adjacent PADs, we should make sure they are connected outside of PADs and to avoid connecting as bridge. Moreover, in the meantime, we should notice the width of trace.

6. Traces along with the PAD should keep the same width. If not accordant with electrode size, we should check if short circuit happen or not. 

7. Pay attention that PADs should not have VIAs.

8. Leading wire could not be near the edge of PCB. Further, it’s not allowed to add copper at the edge of PCB or tooling holes.

9. If value of capacitor is big, we should firstly consider if the temperature of capacitor meet the requirement or not. And second assure the capacitor far from the heating area.

10. In the end, we should payment more attention on the technology of SMD assembly of capacitor. When do SMD near heating area, capacitors will be easily deciduous from PCB because of shaking during production.

The basic knowledge of printed circuit board (PCB)

Printed circuit board (PCB) almost appear in every electronic device. If there is electronic components in some kind of device, they also be mounted on various sizes of PCB. Except fixing these varieties of small sparts, the main function of PCB is to provide electrical connection for sorts of PCB parts to each other. As the electronic equipments become more complicate and require more spares, the circuits and spares on PCB also become more and more intensive. Standard PCB look like this. Bare board (without any top spares) is also often to be called Printed Wiring Board (PWB). 

The baseboard itself is made of insulate and inflexible materials. The tiny circuit material on the surface which can be seen called the copper foil. Oringinally copper foil is covering the entire board, but some parts of them were etched during manufacturing process, the left parts become tiny circuits like mash lines. These circuits are called conductor pattern or PCB layout, and used to provide electrical connection for PCB components.

For fixing the parts on the PCB, we weld their pins on the wiring directly. For a basic PCB (single-panel), all components were concentrated on the one side, and wirings were concentrated on the other side. As such, we need punch holes on the board, for pins to get through to the other side of the board, so pins of components were welded on the other side of the board. Because of it, the front side and back side of PCB are called Component Side and Solder Side.

If there is a certain part on PCB need to be removed or put back after the production is completed, socket will be used when the component mounting. Because the socket is soldered directly on the board, the parts can be any disassembly. See below is ZIF (Zero Insertion Force, zero-pluggable power type) socket, which allows parts (here refers to the CPU) can be easily inserted into the socket, also can be removed. Fixed pole near socket can be fixed after you inserted into the socket.

If you interconcet two PCBs, generally we will use the edge conncetor of known as "Goldfinger". Goldfinger contains many bare copper pads, in fact these copper pads are also one part of PCB routing. Normally, when connection we will put the gold finger from one PCB inserted into the appropriate slot from another piece of PCB (commonly called expansion slots). In the computer, such as graphics cards, sound cards, or other similar interface cards, are connected to the motherboard by the gold finger. 

Green or brown on the PCB is solder mask color. This layer is an insulating protective layer can protect the copper, the parts can be prevented from being welded to the incorrect place. Besides, a silk screen layer will be printed on the solder resist layer. Usually there will be printed some text and symbols (mostly white) to mark out the position of the parts on the board. The silk screen is also called legend.