TECCOR Thyristor application notes AN1001 - AN1010 in one 70+ page pdf. Curated by Littlefuse in 2008 and may be older or much older. As well as a very good cross section of thryristor material they throw in bonus related advice on curve tracer use, soldering, mounting and misc other matters. . Russell _______________________ "AN1001 Teccor - LittleFuse - Fundamental characteristics of thyristors - superb - PowerThyristorApplicationNotes _q98.pdf" --=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 .