My new VCO

[jh]

>Very interesting stuff. Now all we need is a 14/16 bit multiplexed DAC.

Not sure about that. There was an interesting article from Paia's John
Simonton in Electronotes (#61, if memory serves) where he shows
how to do it with a (very special) discrete 6-bit DAC. 
The idea looks brilliant: changing the gain of 3 opamp stages with
6 electronic switches, so you get a scaled multiplication
(where you have addition in a normal DAC). John ?

>BTW, there's some leftover text up in the upper-left corner of the the
>drawing.

Yes (;->). That's the wrong component names stacked on top of one
another from the PSpice schematics editor (no 2SC1583 models (;-<) )

JH.