At 05:51 PM 2/21/2004 +0100, you wrote: >Thank you all for your replies. > >One last question, if you don't mind: if the max base current is >no more than 1 mA, can I safely use the base-emitter zener effect >without causing damage? Or even that little 1 mA is going to slowly >destroy the transistor anyway? Put the diode in there. Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads