> One not-so-obvious use of a TO-18 package is that you can cut the > top off to expose the die and use it as an opto-transistor. Works > quite well. Joe, could you give me some insight on this? sounds really interesting, but= a first search on google produced nothing but datasheets of phototransisto= rs Thank you, Jacopo =20 --=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 .