Download A Guide to Printed Circuit Board Design by Charles Hamilton PDF

By Charles Hamilton

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Extra resources for A Guide to Printed Circuit Board Design

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1 CAD sequence f o r t h e g e n e r a t i o n of PCB master patterns The preparation o f line d r a w i n g s f o r i n p u t via CAD The design layout (viewed as drawn from the component side) is placed accurately over the precision grid and the line drawing master sheet placed on top. 003in thick, should be used. It is of the utmost importance that line drawings submitted for digitising be precise and unambiguous in the requirements stated; therefore, a code of practice should be adopted and strictly observed by the drawing-office concerned.

G. with fixed centre components, etc. However, particular care must be taken in placing the pads accurately, including those which are 'off-grid', and this is why a good light-table and precision grid are so necessary to the task. Another feature on some of the latest light-tables is that the precision grid pattern is already photo-etched on to the glass screen, which eliminates the need for a separate grid sheet and also incorporating even greater accuracy. The pad diameters will have already been drawn on the design layout from the details in the Component Information File, and/or using the Puppet/component outline technique.

With all of the above operations completed, all that remains to be done is to add corner markers to the periphery of the board and also the issue letter or number. , when the artworks are being issued for production quantities. 002in\ With the solder side artwork completed, we can now remove this and the layout from the light-table. Immediately reverse the completed solder side artwork and place on top of the precision grid, again taking the greatest care in the alignment. Then place a new blank master artwork sheet on top, to create the component 40 A guide to printed circuit board design side conductor pattern.

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