Voltage regulator with alternate voltage source...

Bill Sudbrink wh.sudbrink at verizon.net
Thu Apr 7 15:38:37 CDT 2016

If you have a circuit which is normally designed to
operate with an unregulated supply, through a regulator...
say unregulated +8 through a 7805 to a regulated +5 and
you want to test it independent of the +8 supply, if
you leave the unregulated rail unattached and put +5
switcher straight onto the regulated +5 rail, will you
damage the 7805?  Clearly the VIN is open, but the ground
pin will still be attached.  Would this push voltage
back through and screw things up?

Bill S.

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