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[DPRG] (no subject)
Subject: [DPRG] (no subject)
From: Zac Wheeler
zac at poor-robot.com
Date: Mon Mar 26 12:36:21 CDT 2007
Rick Bickle wrote:
>
> Hello all,
>
> I've got an application where I want to put a number of 9v batteries
> in parallel to increase the current capacity. I need to prevent the
> higher voltage cells from discharging into lower voltage ones, but I
> don't want to have the 0.7 volt diode drop. (Germanium diodes don't
> have enough current capacity.) Doe anyone have a circuit to do the
> same job as diode isolation without the voltage drop?
>
Just out of curiosity, how much current are you pulling from each 9V
that you can't get a Schottky diode (similar voltage drop to Ge diodes)
with that current capacity? 9V batteries have a reasonable amount of
internal resistance, and they don't last long when they get hot.
You could also look at a solution with a P-FET, although it may take
some modification to work well in this application:
http://www.geofex.com/Article_Folders/mosswitch/mosswitch.htm
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