well thanks for your suggestions. I do agree with you that we get chip details from manufacturers but schematic diagrams are avilable as pdf files and books also. Can you suggest few few sites which gives these circuit diagram free downloads.
But we do get those schematics, and in china I came to know they have circuit diagram books, but transportation is quite costly. Many websites sell these schematic diagrams but for each diagrams they charge aroud 4USD TO 10USD.
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