DAC scale factor for 1V/oct

[WeAreAs1 at aol.com]

In a message dated 7/21/00 11:31:31 AM Pacific Daylight Time, 
JohnS at molectron.com writes:

<< The DAC requires a ref voltage.  I can vary this using a pot thereby 
scaling
 the voltage output.  Alternatively I can use a constant reference voltage
 and vary the output voltage at my DAC output stage by using a pot on the
 feedback path of the op-amp.
 
 Which way is the better way to go? >>

The latter.  Use the best constant-volatge reference source you can for the 
DAC reference input, and scale it after the output.  

Michael Bacich