Voltage regulator with alternate voltage source...

wulfman wulfman at wulfman.com
Thu Apr 7 15:41:23 CDT 2016

You should be just fine.

On 4/7/2016 1:38 PM, Bill Sudbrink wrote:
> 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?
> Thanks,
> Bill S.

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