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Step 5Exposing Your PCB to Light
The presensitized PCB boards have photo-resist coated on them. The way the process works is everything that you have as black on your design will remain as copper. The areas that are clear, will be removed by the developer and be left with bare board.
The boards come in a foil wrapping, with a peel of white protective cover over the photo side. It's not necessary but I usually dim the lights a little bit just to be on the safe side while I am lining up my design onto the board.
Once you are satisfied with how the design is laid out on the PCB board, you can then turn on the natural daylight lamp. I have found that 14 minutes seems to be perfect timing for exposure with the lamp being 5 1/2 " away. If your lamp is closer or further away you will have to experiment with timing. The manufacturer recommends 10 minutes.
The boards come in a foil wrapping, with a peel of white protective cover over the photo side. It's not necessary but I usually dim the lights a little bit just to be on the safe side while I am lining up my design onto the board.
Once you are satisfied with how the design is laid out on the PCB board, you can then turn on the natural daylight lamp. I have found that 14 minutes seems to be perfect timing for exposure with the lamp being 5 1/2 " away. If your lamp is closer or further away you will have to experiment with timing. The manufacturer recommends 10 minutes.
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Dec 8, 2010. 2:03 PMcoleyy
says:
can you just use grafix rub-onz to put the pattern on the pcb?
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