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It turns out that the part in the question Generating negative voltage rail using 7805 is a P7805, which is a DC-to-DC converter, not a linear voltage regulator.

I notice that no-one has changed the part number in the question's title - is that deliberate or just that no-one's done it yet? (I know I've missed editing a title elsewhere lots of times when editing the body of a question.)

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Done. And the comments and answers based on the misreading have been cleaned up.

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  • \$\begingroup\$ Is that wise? OPs entire question relies on them thinking it's a regular 7805, AND the answer OP lifted that from states using a 780x regulator, not specifying it's a P7805 except for the image. Changing the question and removing the answers doesn't actually address that. \$\endgroup\$
    – Passerby
    Aug 31, 2019 at 17:41
  • \$\begingroup\$ @Passerby: It appeared to me that the OP understood exactly what he had, and was simply sloppy about writing the title of the question. As a result, many of the comments and answers started off on the wrong foot. \$\endgroup\$
    – Dave Tweed
    Aug 31, 2019 at 18:54

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