Hex VC mixer

[danial stocks]

>
>
>
>While were on the subject of digital logic for analog functions, This
>reminds me of something i saw with a 4011 that made it function
>as a quad op-amp. Connect one of the inputs to vcc, and the extra input
>acts like the negative input on an op-amp. Add your resistors and
>feedback loop, there you go.
>
>I haven't tried this myself, Same idea, maybe?
>
>On a sidenote, maybe you could use the input connected to vcc to toggle it
>between inverting an non inverting. Once again, i haven't tried this.


Nat semi has a whole apps note on CMOS as linear in their early paper CMOS 
data book.. I think they maybe didnt put this on their CD roms etc? 
Interestingly no mention of the 4049 tricks, but gates as op amps  etc is 
all there..
I'd think that the extra pin on the 4011 would most probably act as a gate 
terminal ie H= op amp, L= high level o/p.. Altho running gates with 2 analog 
inputs could make for some interesting possibilites... 4081 and gate = 
analog multiplier? [ring modulator]

Cheers,
Dan
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