Just put forward-biased diodes - say a 4001 but 400x will do - in series with the supply to the 7805. Each diode will drop about 0.6 volt so 4 in series should drop 40v down to 37.6 volts. Ted Mawson www.portfoliopm.com What about a cheap and simple LM317? Daniel... ----- Original Message ----- From: "Milan Pavlica (YU7AEC)" To: Sent: Tuesday, January 15, 2002 10:47 PM Subject: Re: [PIC]: LM7805 > hmmmm, i have builded it and it works :)) i havent no problems with it > i think that max voltage input is about 45V DC > See you... > > wouter van ooijen & floortje hanneman wrote: > > > > Why dont try to put one 7824 in front of 7805?? > > > See you.. > > > > Is there any +5V voltage regulator similar to LM7805 out there that > > could > > > > withstand 40V DC in? > > > > In my datasheet the 7824 has 38 V as maximum input. > > > > Wouter van Ooijen > > > > Van Ooijen Technische Informatica: http://www.voti.nl > > Jal compiler for PIC uC's: http://www.voti.nl/jal > > PICs kopen? http://www.voti.nl/shop > > > > -- > > http://www.piclist.com hint: The PICList is archived three different > > ways. See http://www.piclist.com/#archives for details. > -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu