I ran across an interesting article from UH, using a ZVN3306 as a radiation sensor. Can anyone out there tell me how such devices are selected? The data sheet dosen't say a word on it. I know there is something called a "radfet" out there, but haven't run that down yet. It may be that they just bought some fets, tried them, and picked one that worked well, but they don't really say. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist