I am making a circular board that will be filled with exposed copper and has a few holes. I will be soldering parts onto the surface of the board and want some tinned strips to assist in the soldering process. My problem is that I want only those strips to be tinned and leave the rest of the board with exposed copper. The board will not have any masking over it.
Can anyone help me solve this problem?
Draw the tinned areas on a user layer, and tell your fab house to selectively tin only that layer.
And be prepared to pay. It’s an extra masking with subsequent removal for the fab.
I think that cannot be produced.
If you must have the look of bare copper maybe you could try transparent solder mask. I only know of Oshpark offering it (and I think it has to go with black PCB) and I don’t know if the effect is convincing.
How about another solution (rather than implementing what you asked for) ?
For all the exposed pads/tracks use ENIG (Gold plated) then where you want it tinned do it yourself.
This way you get a few benefits:
. . . you will have to pay a bit more for the ENIG.
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