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[DPRG] (no subject)
Subject: [DPRG] (no subject)
From: Eric Sumner
kd5bjo at gmail.com
Date: Thu Mar 29 11:07:21 CDT 2007
> I'm a little confused about this circuit you gave a link to. He uses a P
> channel MOSFET to turn on the load when the battery is the correct
> polarity, but I think there's a problem with the logic. MOSFETs have an
> inherent reverse bias diode that comes as a side effect of the
> construction. When the MOSFET is reverse biased, wouldn't it just
> conduct in the reverse direction with a diode drop?
He's actually got aan explanation of that in the article. The FET is
in the circuit "backwards" to fx that problem at the expense of it not
operating at maximum efficiency.
-- Eric
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