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anyone ever used Positiv20 ?

Discussion in 'General Electronics Discussion' started by Jouellet, Feb 26, 2015.

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  1. Jouellet

    Jouellet

    86
    19
    Feb 2, 2015
    Hi !

    finally was able to get some cans of Positiv20.

    Anyone ever used that stuff ? Got some good result ? I cannot get any decent result with it !

    Tried to spray thin coat/thick coat, tried different exposure time...results are not impressive !

    for those wondering what this is, it is a spray that you put on bare PCB to make them photosensitive, so you can expose them to UV light to make PCB....
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,713
    2,719
    Nov 17, 2011
    I used to use this spray years ago and I couldn't complain. I followed the instructions and applied a coating as even as possible, not too thick, not too thin.
    At the time I (ab)used a 300W UV lamp that was designed for medical purposes for exposure.
    I think I may have had to repair the odd trace using a pen with etch resistant ink.

    Apart from the Positiv20 the quality of your mask is important. When I used photocopies on transparent film, the quality of the resulting etch mask was determined by the pinholes in the toner on the film. When I used masks created from dots and tape (well before computers and EDA programs took over) the results were much improved.
     
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