Voltage regulator with alternate voltage source...

[Bill Sudbrink]

drlegendre wrote:
> Not saying it's going to smoke-out, but it does
> seem like a wonky thing to do.

I disagree about "wonky" let me try with more
diagram and less English:

  (+8)
    |
 VIN|    ceramic cap
    |-----][-----
 ___|____       |
 | 7805 |----------GROUND
 --------       |
    |           |
VOUT|(+5)       |
    |           |
 ___|____       |
 | LOAD |-------|
 --------

+8 is not currently available (no pun intended).
I would like to test LOAD without removing 7805
as it is soldered in place.  Is damage to 7805
likely if alternative regulated current is applied
at (+5) and (+8) is left open?

Bill S.