Gold or conductive carbon is best. HASL will die over time. For a hobby project, maybe hack up a donor keyboard, superglue the pads in the right position on a piece of blank PCB? On Sun, Feb 5, 2012 at 8:21 AM, PICdude wrote: > Anyone here knows much about these? =A0I want to make a PCB to fit in an > existing enclosure with existing buttons, and wondering what I need to > do for the PCB side. =A0The always seems to be black, and IIRC this is a > carbon coating...? =A0Can I use regular HASL for this? =A0Or will it > tarnish over time? =A0Is there anything DIY I can do to make it > tarnish-proof? =A0I only want to make a handful of these, so I expect > getting PCB's with non-standard coatings will be cost-prohibitive I > suspect. > > Cheers, > -Neil. > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .