How to design a PCB( Printed Circuit Board ) ?

WDF-FPC-M-37,4 layer,wonderfulpcb.com

Initially PCBs were designed manually by creating a photomask on a clear mylar sheet, usually at two or four times the true size. Starting from the schematic diagram the component pin pads were laid out on the mylar and then traces were routed to connect the pads. Rub-on dry transfers of common component footprints increased efficiency. Traces were made with self-adhesive tape. Pre-printed non-reproducing grids on the mylar assisted in layout. To fabricate the board, the finished photomask was photolithographically reproduced onto a photoresist coated on the blank copper-clad boards.

Nowadays PCBs are designed with dedicated layout software, generally in the following steps:

1.Schematic capture through an electronic design automation (EDA) tool.

2.Card dimensions and template are decided based on required circuitry and case of the PCB.

3.The positions of the components and heat sinks are determined.

4.Layer stack of the PCB is decided, with one to tens of layers depending on complexity. Ground and power planes are decided. A power plane is the counterpart to a ground plane and behaves as an AC signal ground while providing DC power to the circuits mounted on the PCB. Signal interconnections are traced on signal planes. Signal planes can be on the outer as well as inner layers. For optimal EMI performance high frequency signals are routed in internal layers between power or ground planes.

5.Line impedance is determined using dielectric layer thickness, routing copper thickness and trace-width. Trace separation is also taken into account in case of differential signals. Microstrip, stripline or dual stripline can be used to route signals.

6.Components are placed. Thermal considerations and geometry are taken into account. Vias and lands are marked.

7.Signal traces are routed. Electronic design automation tools usually create clearances and connections in power and ground planes automatically.

8.Gerber files are generated for manufacturing.

For further detailes, please contact wonderful09@wonderfulpcb.com.

How to customize a PCB ?

As a customer of PCB industry, you may often ask: How can I customize a PCB board? Why can’t the PCB manufacturer ( or PCBA manufacturer ) follow my requirements?

Actually, you should ask yourself first: Have I got a design document?

Well, to customize a PCB board, you need to offer a design document first which is called a “Gerber file”, it is used to describe your requirements for the PCB board you’d like to customize.

What will be contained in a Gerber file?

① Layer count
② Delivery size
③ Surface finished (such as: HASL, ENIG)
④ Material (such as: FR1, FR4,FR2, CEM-1)
⑤ Board thickness
⑥ Copper thickness
⑦ Solder mask

Items above, they make it each other possible. Otherwise, it may cost engineering problems.

Is it absolutely necessary to have a Gerber file?

Fortunately, it is not if you happened to have a sample PCB board and want a large number of that. You simply send the sample PCB board to the PCB manufacturer works for you, and then all you need to do is enjoying a short wait until the PCB manufacturer send back a host of PCBs, each one of which is the same as the one you send to them.

For PCBA, a BOM list ( BOM-Bill of material ) is necessary during customization.

Pay attention that you should make sure the list providing as many details as possible about the used materials. Otherwise, it may cost engineering problems.

In conclusion, if you want to customize a PCB board or get some PCBA services, you need to find a high quality, experienced PCB manufacturer or PCBA manufacturer and offer your Gerber file, sample PCB board, or BOM list as your requirements.

WONDERFULPCB.COM

PCB, CCL application CQC authentication problem solving-（2）---Wonderful PCB (hk) Limited

(5) China quality certification center after receiving the test results, according to the requirements of relevant procedure contact the applicant for factory inspection for the first time (if already held CQC certification, and effective certificate does not need to factory inspection) for the first time.
6 China quality certification center, after receipt of the sample test report and factory inspection report. Enterprise certification fee. After evaluation of qualified product certification certificate.
5, the new measures, the factory to supervise and inspect the frequency change? What are the specific requirements of factory inspection?
Answer: on May 16, 2008, the revision (CQC logo certification of special rules, the factory to supervise and inspect the amended by once a year to once every quarter; for the specific requirements of the factory inspection can view the CQC logo certification of special rules annex 7 requirements of factory quality assurance ability.
6 what are the main cost, application CQC?
A: in general, is the cost of main application CQC: application fee: 600 yuan/zhang, approved registration fee: RMB 1000 / sheet; : please according to the requirements of the enterprise application project, category, such as case, determine the bid; As defined by the scale of factory factory inspection fee for the first time: (RMB 3000 / per person). The final payment by CQC notice shall prevail.
7, application considerations of CQC standard sample production?

Dear my friend,
We will attend AsiaWorld-Expo Apr.11-14th and OCT.11-14th 2015. We sincerely invite you

to attend it with us together. Hope we can meet you in Hongkong soon.
Booth Number: 9C27/ 9G24
Time: Apr.11-14th and OCT.11-14th, 2015
Address: AsiaWorld-Expo in Hong Kong
http://www.wonderfulpcb.com/
                                        Wonderful PCB (HK) Limited

WonderfuI Printed Circuit Board

    Flying Probe Tester is a test PCB manufacturing environment system. Instead of using the conventional on-line testing machine all conventional needle bed (bed-of-nails) interface, flying probe test uses four to eight independent control of the probe, is moved to the test element. In the measurement unit (UUT, unit under test) supplied to the testing machine by a belt or other transmission system UUT. Followed by fixing the probe tester to test pad (test pad) and a via hole (via) was tested for in a single element measuring means (UUT) is. Test probe connected via multiplexing (multiplexing) to the drive system (signal generator, power supply, etc.) and sensor (DMM, frequency counter, etc.) to the test element on the UUT. When a component is being tested, and other components on the UUT through the probe electrically shielded to prevent interference readings (Figure 1).
    Flying Probe Tester can check the short circuit, open circuit and component values. On the flying probe test also uses a camera to help locate the missing elements. With a camera to check the direction clear element shapes, such as polar capacitors. With the probe positioning accuracy and repeatability reach 5-15 micron range, flying probe tester can accurately detect UUT.
    Flying Probe Test solve a lot of the current problems in PCB assembly to see, such as the lack of a model in the development of gold (golden standard board). Problems may take up to 4-6 weeks also includes test development cycle; about $ 10,000- $ 50,000 a fixture development costs; not less economically test production; and the inability to quickly test the prototype (prototype) assembly. These cases illustrate, the traditional test-bed tester lack of low cost production system; lack of a quick test prototype assembly cover; and can not test to shield assembly.
    Because the ability to have close contact with the UUT shielding ability and help reach the market faster (time-to-market), the flying probe test is an invaluable resource production. Further, since no test development engineer experienced, the system can be considered as having the added value of savings in equipment and time savings and other benefits of manpower.

Sophie Deng
_______________________________________
Wonderful PCB Limited
NO.32A,Building NO.1, XianDaiC hengHuaTing,ChuangYeRoad|NanShan District,ShenZhen City 518054|  China  T +86-755-86229518-806 | F  +86 755 2607 3529|  e  wonderful08@wonderfulpcb.com |
w  www.wonderfulpcb.com  | Skype:wonderful-07   |                                                   
Welcome to our trading shows:
1.Booth: L32,Expo Electronic 2013,Apr.10-12th in CROCUS EXPO,Moscow,Russia
2.Booth: 11J36, HK Global sources  Apr.12-15th, 2013 Asia World-Expo, Hong Kong
3.Booth: 9J35, HK Global sources Oct.12-15th,2013 Asia World-Expo, Hong Kong
4.Booth: 70206, CES  2014  Jan,8th-11th in Las Vegas, USA