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Tuesday, July 21, 2009

PCB Design basics

PCB Design basics
Electronics circuits are designed using Printed Circuit Boards. Sometimes we do not know the procedures to do a PCB design. PCBs form the core of electronic equipment domestic and industrial. Some of the areas where PCBs are intensively used are computers, process control, telecommunications and instrumentation. I would like to share the various steps in PCB design here.

1. MANUFACTURING
The manufacturing process consists of two methods; print and etch, and print, plate and etch. The single sided PCBs are usually made using the print and etch method. The double sided plate through – hole (PTH) boards are made by the print plate and etch method.
The production of multi layer boards uses both the methods. The inner layers are printed and etch while the outer layers are produced by print, plate and etch after pressing the inner layers. The software used in our project to obtain the schematic layout is MICROSIM.
2. PANELISATION
Here the schematic transformed in to the working positive/negative films. The circuit is repeated conveniently to accommodate economically as many circuits as possible in a panel, which can be operated in every sequence of subsequent steps in the PCB process. This is called penalization. For the PTH boards, the next operation is drilling.
3. DRILLING AND PLATING
PCB drilling is a state of the art operation. Very small holes are drilled with high speed CNC drilling machines, giving a wall finish with less or no smear or epoxy, required for void free through hole plating. The heart of the PCB manufacturing process. The holes drilled in the board are treated both mechanically and chemically before depositing the copper by the electro less copper platting process.

4. ETCHING
Once a multiplayer board is drilled and electro less copper deposited, the image available in the form of a film is transferred on to the out side by photo printing using a dry film printing process. The boards are then electrolytic plated on to the circuit pattern with copper and tin. The tin-plated deposit serves an etch resist when copper in the unwanted area is removed by the conveyor’s spray etching machines with chemical etch ants. The etching machines are attached to automatic dosing equipment, which analyses and controls etch ants concentrations.

5. SOLDERMASK
Since a PCB design may call for very close spacing between conductors, a solder mask has to be applied on the both sides of the circuitry to avoid the bridging of conductors. The solder mask ink is applied by screening. The ink is dried, exposed to UV, developed in a mild alkaline solution and finally cured by both UV and thermal energy.
After applying the solder mask, the circuit pads are soldered using the hot air leveling process. The bare bodies fluxed and dipped in to a molten solder bath. While removing the board from the solder bath, hot air is blown on both sides of the board through air knives in the machines, leaving the board soldered and leveled. This is one of the common finishes given to the boards. Thus the double sided plated through whole printed circuit board is manufactured and is now ready for the components to be soldered.

2 comments:

Maria said...

Creating a pcb design layout may be more than a handful, especially for beginners, since it requires specialized skills and knowledge on circuits and electronics. Your explanation regarding the basics of PCB design is very helpful. Moreover, since most industries need PCB in their businesses, they outsource to long production run manufacturers for PCB design services. I guess, those who can perform PCB designing by themselves truly deserve a pat on the back because this is not a very easy job. Good job guys!

alansaki said...

Superb and really helpful resource for all pcb designer and manufacture who need to design some circuit board .

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