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PCB Design Rules

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Initially PCBs were designed manually by creating a photomask on a clear mylar sheet, usually at two or four times the true size. Starting from the schematic diagram the component pin pads were laid out on the mylar and then traces were routed to connect the pads. If you have many questions of PCB Design, please come here!

Community > Groups > PCB Design Rules > How to align a two layer PCB easy?
How to align a two layer PCB easy?
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When I use Press-n-Peel for preparing a DIY 2 layer PCB. Aligning the bottom and top layer so that the holes and vias match on the copper between layers is a problem for me. To minimize the wrong alignment,can you have any advices for me?
Statement: This post is only the personal view of the author and does not represent the opinions of

Jason Williams

My method was to stick each side down onto an L shaped piece of scrap PCB. So that you can remove parallax errors between the layers and get much better registration.


Use two points on the pcb as reference points, drill, and align each separately. Hold both pieces up to the light, get both aligned, and staple or tape end of sheets together so it folds like a notebook. This requires an extra two inches or so on the end to allow flexing around the end of the board. Sometimes I also tape it to the board to keep it aligned.


Include a couple registration marks, or use some vias or through-holes for alignment. Attach one side, drill the holes, then use those holes to align the other side.

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