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Electronics PCB Manufacture

PCB Manufacture – Part 2

So after a bit of experimentation, turns out its less the strength of the sodium hydroxide that matters, more the temperature. Using a water bath at ‘slightly warm’ (technical term :P) with a 1.5% solution, the board developed perfectly. This is after 8 minutes in the exposure box, but still, thats a 10mil trace its done. I think its 10mil anyway, will check my original drawing later. Just about to etch it to make sure its worked well.

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exposed board ready for etching
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PCB Manufacture – Part 1

Currently sat in my garage, waiting for a UV photo resist board to be exposed – trying it at 8 minutes. This is after our first forray into UV pcb’s, where we didn’t expose it for long at all… and it didn’t work. Well, it did, after we put it in an even higher strength sodium hydroxide solution…. around maybe 7% or so… and proceeded to eat all the resist off. Will post to say how well this one goes…

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my diy uv exposure box... cardboard chic 😛