On Nov 5, 2005, at 9:30 AM, Bob Axtell wrote:

> If the GND pin of a 7805 is opened, the pass element inside is 7805
> is switched on fully, and  the OUT pin equals the IN pin except for
> a small PN drop.
>
But the circuit doesn't have a return path either, so effectively
you're just switching the ground wire ("low side switching") instead
of the V+ rail, which should be fine for a battery operated circuit,
even if it feels a bit weird...

BillW

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