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What settings should I use for creating schematic symbols?

This tutorial requires:

DesignSpark PCB V11.0.0

There are no restrictions on the size of a schematic symbol, but you should match the size to your other symbols to achieve a consistent schematic design.

The default technology file uses a 50 thou grid.

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Some standard symbols from PPL are shown below with their respected length and width. The styles used in creating the component schematic symbol are (viewable in the design technology):

Line style 'pin' which has a width of 6.

Line style 'thin' which has a width of 10.

Text style 'default' which has a width of 50 and a line width of 5 using the "System Stroke Font".

Using these details as a guide you will be able to create consistent schematic symbols.

I'm a Mechanical Engineer by qualification though I worked for a long time specialising in Motion Control systems and integration with various PLC systems. I've wide experience of many types of applications from packaging machines to military and some applications that I can't mention. At home, I like to tinker and make things with wood, metal, plastics, electronics and mechanical system. I'm never happier than with a hammer and a screwdriver in my hands....