By Charles Hamilton
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Additional resources for A Guide to Printed Circuit Board Design
In this connection, Chartpak have produced a spring-loaded, ball-ended tool which is ideal for transferring the characters to the artwork sheet. ). 5 6 2 4 9 3 10 3 14 r PL A . "M TR ' <. 4 r ^ n # #J L ^ RU C93 C97 -H20 "j 0 C96 ? 17 2S 3 1 r, * TR1 TR1S 11 2l J ~\ - L U3 _j J TP 1 L6 FL1 £l cioo * K • -1 '• e4 n \^ L r J " TR3 111* "r r |L14 TR2 r j « | J M i -il o « C80 9 1 l J L WZ s to 1 T «. -| R TP4 * 20 7 J J ff IS 1? 19 L e g e n d / c o d i n g patterns It is preferred that all production PCBs be printed, and for legend/coding details the designer should always refer to individual company standards for guidance regarding content, sizes and style of character, polarity symbols, etc.
19 L e g e n d / c o d i n g patterns It is preferred that all production PCBs be printed, and for legend/coding details the designer should always refer to individual company standards for guidance regarding content, sizes and style of character, polarity symbols, etc. Again the designer should be aware that the legend/coding details will be produced on the board by the screen printing process. J Preparing the master artworks 51 Any ink getting into the holes will inhibit the flow soldering process; the same design minima will apply as for the component side resist master pattern and the designer should therefore use the solder side conductor pattern pads as 'no-go' areas for the placement of legend/ coding details.
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. In this connection, Chartpak have produced a spring-loaded, ball-ended tool which is ideal for transferring the characters to the artwork sheet. ). 5 6 2 4 9 3 10 3 14 r PL A . "M TR ' <. 4 r ^ n # #J L ^ RU C93 C97 -H20 "j 0 C96 ?