tag:blogger.com,1999:blog-107690192012-02-01T01:03:17.793+08:00WaiTeenoreply@blogger.comBlogger141100tag:blogger.com,1999:blog-10769019.post-44523781334837298162011-06-27T21:29:00.000+08:002011-06-27T21:31:04.701+08:00

WaiTeenoreply@blogger.com1tag:blogger.com,1999:blog-10769019.post-2096311573654877632011-06-27T21:26:00.001+08:002011-06-27T21:27:53.318+08:00

WaiTeenoreply@blogger.com0tag:blogger.com,1999:blog-10769019.post-46189267763797448912008-07-11T16:28:00.003+08:002008-07-11T16:45:40.242+08:00

FR- Flame RetardantFR-2 Phenolic Cotton paperFR-3 Cotton paper and epoxyFR-4 Woven Glass and epoxyFR-5 Woven Glass and epoxyFR-6 Matte Glass and epoxyG-10 Woven glass and epoxyCEM-1 Cotten paper and epoxyCEM-2 Cotten paper and epoxyCEM-3 Woven Glass and epoxyCEM-4 Woven Glass and epoxyCEM-5 Woven Glass and

WaiTeenoreply@blogger.com39tag:blogger.com,1999:blog-10769019.post-41143917259301642332008-02-29T08:56:00.000+08:002008-02-29T08:57:06.940+08:00

document.write(''); Read this doc on Scribd: Microsoft Word - Pdock handout var scribd_doc = new scribd.Document(2174686, 'key-164rc6hjkidxvvdn0djv'); scribd_doc.addParam('height', 500); scribd_doc.addParam('width', 450); scribd_doc.addParam('page', 1); scribd_doc.addParam('mode', 'book'); scribd_doc.write('embedded_flash_2174686_1d305u');

WaiTeenoreply@blogger.com0tag:blogger.com,1999:blog-10769019.post-1139024733051039392006-02-04T11:44:00.000+08:002008-12-13T23:39:45.613+08:00

WaiTeenoreply@blogger.com2tag:blogger.com,1999:blog-10769019.post-1138967367416655582006-02-03T19:48:00.000+08:002006-02-03T19:49:27.426+08:00

WaiTeenoreply@blogger.com0tag:blogger.com,1999:blog-10769019.post-1138963035687424292006-02-03T18:34:00.000+08:002006-02-03T18:37:15.696+08:00

WaiTeenoreply@blogger.com0tag:blogger.com,1999:blog-10769019.post-1134232982938676242005-12-11T00:40:00.000+08:002005-12-11T00:43:02.953+08:00

TinyCAD is a program to help you draw circuit diagrams. It comes complete with symbol libraries to get you started straight away. As well as being able to simply print your designs, you can use TinyCAD to publish your drawings by copying and pasting into a Word document, or saving as a PNG bitmap for the web. You can use TinyCAD as a front end to a PCB layout program (see the links), by

WaiTeenoreply@blogger.com2tag:blogger.com,1999:blog-10769019.post-1118367561288464212005-06-10T09:29:00.000+08:002005-06-10T09:39:21.293+08:00

ApertureThis is a text file describing the size and shape of each element on the board. These are also known as a D-code lists. These lists are not necessary if your files are saved as Extended Gerber with embedded Apertures (RS274X).Aspect RatioStandard aspect ratio of 6:1 has been figured into our quote forms. This equals the smallest hole size that can support plating. It is calculate by

WaiTeenoreply@blogger.com7tag:blogger.com,1999:blog-10769019.post-1115383609374827322005-05-06T20:41:00.000+08:002005-05-06T20:46:49.383+08:00

A printed circuit board or PCB interconnects electronic components without discrete wires. Alternative names are printed wiring board or PWB.A printed circuit board consists of "printed wires" attached to a sheet of insulator. The conductive "printed wires" are called "traces". The insulator is called the substrate, and is made of "Pertinax" (a phenol formaldehyde resin) or a

WaiTeenoreply@blogger.com2tag:blogger.com,1999:blog-10769019.post-1114003447231727062005-04-20T21:20:00.000+08:002006-01-03T11:56:01.553+08:00

In the table the following are assumed * 1oz/sq foot copper (0.035mm thickness). * 10 degree C rise on outer layers, 20 degree C inner layers * Groups of high current tracks will be de-rated * Tracks are not near or over 'Heat Sink' areasImperial Width Metric Width Current Capacity 0.010" 0.25mm 0.8 Amps0.015" 0.38mm 1.2 Amps0.020" 0.50mm 1.5 Amps0.050" 1.27mm 3.2

WaiTeenoreply@blogger.com0tag:blogger.com,1999:blog-10769019.post-1112881358469704992005-04-07T21:22:00.000+08:002005-04-07T21:42:38.470+08:00

Printed Circuit Board (PCB) are manufactured through a series of phot imaging and etching processes. For a start we need a schematic of the circuit to be created in a CAD software, from this schematic a "Gerber Data file is created and then is converted via computer aided manufacturing software (CAM) to form the basic layout of the Printed Circuit board itself.CAM software will generate the

WaiTeenoreply@blogger.com1tag:blogger.com,1999:blog-10769019.post-1108777603794454192005-02-19T09:46:00.000+08:002005-02-19T09:46:43.796+08:00

pcbflow 

WaiTeenoreply@blogger.com0tag:blogger.com,1999:blog-10769019.post-1108180063412506402005-02-12T11:29:00.000+08:002005-02-12T11:47:43.413+08:00

PAUL EISLER1907 Paul Eisler born.1930 Qualified in Engineering at Vienna University.Installing radios into trains in Belgrade and also work as a printer1934 lost his job1936 left for England1943 Patent printed circuits1945 After end of Second World War USA release secret of printed circuit board.1948 All electronics in airborne instruments use printed circuit boards.

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