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Re: [Homebrew_PCBs] 10W ~380nm UV LED for exposing Riston & other negative film photoresists

2013-09-17 by Robin Whittle

A correction: the exposure times I tested were 20, 40, 60 and 80
seconds, not 100 seconds.  I got good results at 40, 60 and 80 seconds -
a 2:1 exposure range.

  - Robin

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