[sdiy] true VCOs, expo ?

[tony Rolando]

I built a some of these VCO's based around a dual op-amp (LM358). The 
schematic I used was from the National semi-conductor data sheet.

http://www.national.com/pf/LM/LM358.html

I have been trying to get an exponential response from it using some basic 
expo convertor circuits and so far I have failed. Any insight would be 
appreciated.

Also, is this an example of a true Voltage Controlled osc. (as opposed to 
current controlled)? Or is that 100k resistor (R) at the CV input a voltage 
to current? Is there a such thing as a true "voltage controlled" oscillator?

TR

_________________________________________________________________
Check out all that glitters with the MSN Entertainment Guide to the Academy 
Awards®   http://movies.msn.com/movies/oscars2007/?icid=ncoscartagline2