DAC scale factor for 1V/oct

[John Speth]

I'm now designing the DAC portion of a simple MIDI-CV design.  I need to tap
somebody's experience in how I should control the scale factor for the DAC
to get a 1V/oct response.

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?

John Speth
Molectron Detector, Inc.
http://www.molectron.com
mailto:johns at molectron.com 
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