I would like to A/B switch 50 digital signal lines with a mechanical switch= .. Switch must be break before make. Switch time can be several seconds. = Number of cycles will be less than 5000. Does any product or design conce= pt exist ? Best Gus in Denver --=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 .