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Tue May 27 00:02:13 EDT 2014

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The diode ladder might be a stretch to run on 5V.  

What about combining the EIDAC biasing to drive a single-ended ladder
and use opamps to perform the feedback?

Googling gives[1].  Not really what I expected.  Why the stacked
ladder?

(* 8 0.63)

So some questions:

- C vs I_c, what's a good range?
- Why 3 "headroom" diodes?  Might be too much for 5V op.

Wrt headroom, current guess is that there has to be *something* there
to avoid the point to be grounded.  A diode is best since a resistor
wouldn't have enough dynamic range.  A couple of diodes raise the
resistance so give more voltage swing.

Found some more links[3].  The interesting part in that schematic is
the way the signal gets coupled in through the "ground" connection of
one of the caps.

[1] http://www5b.biglobe.ne.jp/~houshu/synth/Vcf0111.gif
[2] http://www5b.biglobe.ne.jp/~houshu/synth/
[3] http://www.experimentalistsanonymous.com/ve3wwg/doku.php?id=diode_ladders





(/ 1.0 (* 6.28 (/ 0.026 0.001) 0.00001))



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