partial succces

Partial succes! ;) I found 2 ways how NOT to do sensor etching.

The coper foil can't be too thick. 0.11mm can seem to be pretty thin, but not for this application.

And Riston photo-resist don't get along with ammonium peroxydisulfate. 1 hour is maximum time within this two can tolerate each other.Just like my...

The solution was in ballpark of 220g/L and room temp for slow copper bite.

I might take this from wrong side, i will try with thin wire instead just to speed up things, while I wait for thinner copper foil.

Discussions

j.f.sebastian wrote 09/08/2017 at 22:43

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j.f.sebastian wrote 09/08/2017 at 22:42

thanks for the tip, I actually added resistor, dissipating 2W, under bath at the end.The whole deal was to etch slowly for that 6mil traces.

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K.C. Lee wrote 09/08/2017 at 18:15

You can use speed up the etching by putting your tray in a hot water bath. e.g. putting the tray inside a baking tray filled with hot water.

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