[sdiy] Possibly Daffy CMOS Thing

[Scott Gravenhorst]

I was looking at the functional schematic of the 4016 and I
thought "what if that control system were fully analog
instead of digital?".  You can't do this with the 4016 (or
4066), but you could build this out of 2 4007s.  One 4007 is
powered normally and provides a linear inverter instead of
the digital one.  The pass through transistors would be the
upper transistor (10,11,12) from one inverter and the lower
transistor (pins 3,4,5) from another.  The 4007 housing the
pass transistors is left unpowered.  I looked at the
protection diode schematic and it looks like no protection
diodes would conduct if pins 14 and 7 are open.

Would this work as a voltage variable "resistor" ?  If so,
it's completely floating.  (resonance controls for SVF?)

Also, (assuming it works) if one end of the pass through
transistors is supplied a low impedance output, like an
opamp buffer, would this have OTA like properties?  As in
could a VC SVF be built similar to the way it's done with an
LM13600?  (I realize that it would be several ICs, 3? for
each "OTA")  I'm pretty sure that distortion would be
involved...  Maybe not "bad" distortion???

Ok, stop laughing now...

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