Why does there seem to be a missing comp

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Why does there seem to be a missing component in many PCBs?

1/19/2017 5:41:48 PM

pcb component

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?

jorgedavid907

1/21/2017 5:41:48 PM

I am going to keep checking for new writings.

Why does there seem to be a missing component in many PCBs?

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