DAC "error"

[Tim Daugard]

> The Resistor Divider method may be better than you think... even 1%
resistors
> from the same manufacturing lot are usually closer than 1%... and the
errors
> do not add.. .they usually (statistically) subtract... One that is a
little
> high is often compensated by one that is a little low...  Depends on how
fussy
> you are...

So, should I put the low resistors on the bottom and the high resistors on
the top to create the same spread tuning effect as a piano? A regulated
current source makes sense, but doesn't the loading by the output buffer
affect the tuning?

I've been using a bass or guitar as my oscillator source so far and using
the synth circuits to modify the signals but I have to build the VCO and
keyboard soon. I'm just waiting on an inexpensive organ to turn up to tear
apart for a keyboard. There's a two manual lowery for $79 eventually it will
come down further.

Tim Daugard