Quote:
Originally posted by Since87
Umm.
Unfortunately, there's a fundamental flaw.
Here is the datasheet for the IRF1407 MOSFET.
If you look at the schematic symbol shown on the first page of the datasheet, you will notice that it is different than the schematic symbol shown in the article for the IRF1407.
In particular, the datasheet shows a symbol for a zener diode built into the MOSFET. (The black triangle with the 'bent and rotated Z' on top of it.)
The forward direction for this diode is such that it will allow current to conduct from the load point back into a supply.
This invalidates one of the major pros listed for this design:
"no possibility of the supplies attempting to charge each other"
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That would assume that the voltage difference is greater than 1.3v: if your supply is off by half of that, you had a problem to start with.
I'll let Yo_Duh complete the answer here, as I'm planning to switch off one of three supplies.