[sdiy] 2164 Expo correction

[David G. Dixon]

> No.  More quiescent current also means more base current.  
> For an expo converter you would want a very low Rbe, but the 
> effective Rbe in the
> SSM2164 is whatever the transistor delivers plus 450 Ohms.  
> You can't work around that since you can't get at the bases directly.

Yes, that 450R resistor is the troublemaker.  Life would be much better if
that weren't there!