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Old 07-05-2010, 10:29 PM   #10 (permalink)
JellyBeanDriver
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- PCB software to do the schematic which then drives the layout of the board. There's some free ones out there.
- Laserprint artwork onto vellum to be used as a photopositive
- cut pre-sensitized PCB blank to size, remove the plastic film, put the artwork on top, sandwich it in a frame and expose the board through the artwork using a fluorescent lamp. Boards are pretty cheap. I bought 6" x 10" for I think $6 a board years ago that I'm still using.
- develop the board
- etch the unwanted copper off
- drill, then stuff.

Exposure has to be experimentally developed. My time is 14.5 mins.
Develop is ~ 5 seconds, or until emulsion clears fully
Etch is ~ 8 mins

Drilling is the biggest problem if you don't have the carbide bits on hand already.

Note that laserprinters are not exact in X and Y so long dimensions can walk off on you. My HP4100 is pretty good, my HP4+ I had before was worse.
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