> Does any product or design concept exist ? Google stackable wafer switch I made one up some time ago that was a 10P6W, out of five 2P6W wafers on a common spindle. Not exactly cheap Don't know if you can get a 6P2W in wafers, nothing pops up with a 6P2W stackable wafer search Any reason you can't use switch ICs ? Joe --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .