Why does there seem to be a missing comp

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Electronic components are basic electronic element or electronic parts usually packaged in a discrete form with two or more connecting leads or metallic pads. Electronic Components are intended to be connected together, usually by soldering to a printed circuit board (PCB), to create an electronic circuit with a particular function.

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Why does there seem to be a missing component in many PCBs? Reply 2017-01-19 17:41:48

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Clark

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I've seen some PCBs were some components have been sketched, but they don't seem to be mounted on the board. See, this image
where the transformer has been drawn: Why is this done on some circuits?

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Reply 2017-01-19 17:41:48

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