New PDF release: A Guide to Printed Circuit Board Design

By Charles Hamilton

ISBN-10: 0408013982

ISBN-13: 9780408013987

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Extra resources for A Guide to Printed Circuit Board Design

Sample text

And also as an aid to servicing in the field. The legend/coding master is produced on a master artwork sheet placed over the layout and the reversed solder side master artwork, the legend/coding details being usually required on the component side of the PCB. The layout is necessary so that the designer can place component codings adjacent to the component outlines. Placing the component codings underneath the components should be avoided as far as possible. Characters are black, usually produced using dry transfer sheets — Letraset, etc.

Ground connections from the solder side go directly through to the ground plane on the component side of the PCB via plated holes. Also, with boards of this type it should be noted that although it is theoretically not necessary to join the ground pads on the solder side (as they all go plated through to the ground plane), in practice it is much better to connect them up in small groups of two, three or four (solder side tracking will probably not allow larger groupings) and where possible not leaving any single ground pad 42 A guide to printed circuit board design isolated on the solder side/component side.

The ground pins of the DIPs should additionally be connected vertically — a track of the same thickness as used for the signal interconnections should be sufficient for this. Note also that the ground connections are brought out horizontally at the end of each row of DIPs to the edge connector (five positions) situated at the left-hand edge of the board. If these basic design rules are followed (as far as is possible within the constraints of the circuit), then a satisfactory ground/power grid system will result.

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A Guide to Printed Circuit Board Design by Charles Hamilton


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