Not to really answer your question, but a schottky should only have a drop between 0,15-0,45. Yours seems to be pretty high. --- Graham North > wrote: >Hi all, > >I have a problem. On a battery powered instrument I have got a diode in >the line from the >batteries to the switching regulators. This diode is there so that when >an external power >supply is connected to the unit, it does not charge the batteries (The >external power supply >is connected straight to the switching regulators when plugged in). > >Sorry, tried to draw this in asci art. > >The problem is this: > >There is a drop of approx 0.8 Volts accross the (schottky) diode. This >limits the life of the >batteries, as the regulators 'drop out' 0.8 V earlier than they could >do. > >Is there a better way to do this?????? > >Thanks > >Graham North _____________________________________________________________ Get your free email here at http://www.e-ha.com -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics