> >If you do what you say you did the transistor will die. > >HOWEVER, you probably omitted to say that there was a resistor between the + > >or - 12v supply and the base. > > Right, a 10 Kohm resistor, to limit current OK - that makes all the difference. Base current will be about 1 mA which is fine. Reverse breakdown will be lower current due to zener action. Going to sleep here while typing . Goodnight. . RM -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads