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

2017/1/19 17:41:48

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?

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jorgedavid907

2017/1/21 17:41:48

I am going to keep checking for new writings.

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