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

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