[sdiy] CV input op-amp circuit

[David G Dixon]

Oops, upon rereading the original email, I see that the actual desired
voltage range is 0V to 3.3V, not 3V.  This is a non-inverting gain of 27.5%
and an inverting gain of -27.5% for a level shift of 1.375V from a -5V
reference.  Both can be achieved with the same resistor pair again (120k and
33k):
 

 
These are standard 5% values, so available at any tolerance.
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