S7.1 Power symbols
Power symbols are special symbols in KiCad, used to designate global nets for power connections.
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Reference Designator must be set to
#PWR
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Power symbols must contain exactly one pin, which is set to invisible
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Electrical pin type must be set to
Power Input
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Pin name must match the symbol name
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Checkbox
Define as power symbol
must be checked
The example image below demonstrates the requirements as listed above: