I have to say - photoresist is the way to go when etching a pcb. I have my eyes on the developing direct inkjet process, but for now I'm sold on photolithography. Processing the board pictured took under an hour even with all my 'first time' errors and fumbles. I highly reccommend the Datak Premier Presensitized boards. I only used one 15 watt daylight bulb for the exposure!
Dark Red/Black positive transparency
15watt daylight bulb 4-6" away
6min exposure
10:1 hot water:developer
develop ~30sec
sweeten to taste, and serve.
Oh, I almost forgot, the subject matter of aforementioned pcb - the Baby 10 sequencer. I'm pretty sure I flubbed this prototype while rushing to test the photo method but I have high hopes for the final design.
Well now I'm off to make some rent money - later on.
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