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?
2017/1/19 17:41:48
Clark
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PCB Assembly
SMT-Stencil
Components Sourcing
jorgedavid907
2017/1/21 17:41:48
I am going to keep checking for new writings.