Monthly Archives: April 2011

How to distinguish films?

Posted by on April 15, 2011 No comments

In general, the master film is also known as the black film, mainly used to copy the work film (yellow film), but not necessarily only a yellow film for work, are also black films do work. It mainly to do high-precision HDI board or to a one-time savings in the production of small quantities of circuit boards and flexibe pcb. Yellow films mainly used in ordinary printed circuit boards and mass production.

Positive film for the use of graphical electroplating, developing is the circuits, leaving the role of anti-corrosion plating, mainly tin and pb plating. Negatives film used for direct etching, leaving the role of circuits. When distinguish the films, the smooth side is black film, in contrast, is yellow film. And generally use scratching pen to scratch the film can be seen smooth side.

Please Note: There are both glossy and matte side of yellow film, and the second is easy to find easy-to-oil surface indentation when using. On film circuits (copper), the transmitting is negative film, opaque positive film.

CMD Circuits is specializing in manufacturing the printed circuit boards, flexible pcb and aluminum pcb, please contact us if any inquiries.

Aluminum pcb applications

Posted by on April 8, 2011 No comments

Aluminum PCB is one of metal-based pcb,including copper foil,thermal insulating layer and metal substrate three parts,and now the aluminum pcb is widely used in the many applications.

1. Audio devices: input,output amplifiers,balanced amplifiers,audio amplifiers,preamplifiers,power amplifiers and so on.
2. Power Supply: Switching Regulator,DC / AC converter,SW regulator and so on.
3. Telecommunications electronic equipments: high-frequency electric amplifiers,transmitter circuit board.
4. Office automation equipments: motor drive,and so on.
5. Automotive: Electronic Ignition,power controller.
6. Computer: CPU board,power controller,floppy disk drive devices.
7. Power modules: converter,power rectifier bridges.
8, lamp lighting: As an advocate to promote energy-saving lamps and colorful energy-saving LED lights are very popular by the market,while the aluminum pcb used in LED lights have begun a large-scale applications.
CMD Circuits have provided the high quality and competitve cost aluminum pcb,aluminum base pcb and other metal base pcb. Please contact us if you have any inquires.