[sdiy] Pitched Noise/VCO Bank Schematic Posted

[Scott Stites]

Hi List,

As promised, I've posted the schematic of the 40106/4070 VCO Bank/Pitched
noise circuit *as it appears on my breadboard* - let me qualify that - it
was a case of limited breadboard real estate combined with a "wonder what it
would sound like if I did this" mentality, and is not how I would implement
it for a module (at least the CV portion).  So, no guffaws from the
bleachers, especially when you see how I decreased the sensitivity of the CV
in.

There are several obvious ways it could be improved (10M resistors in
parallel with the VTL5C2 resistors would be a nice start - or using series
resistance instead of parallel).  Also if one were to - Bissell!  Turn
around and sit up straight, young man!

As I was saying, if one were to put in pots to tune the various stages or
use some other CV control scheme, it may be a neat way of using it as a
'drone' bank as was discussed earlier on this list.  I'd be interested to
know if there were some economical/expedient way to smooth out the square
waves.  In that case, one could plunk in one of those fancy quad four
quadrant multiplier packages in for some fairly cool effects.  It's really
just a - I saw that, Mahoney!  I've got my eye on you...

Uh, I think it would be a nice launching point for various applications.

I did get the oscillator bank design from Tom Henry's 'Noise Generator
Cookbook', and he did give me permission to put it up in this schematic,
though he hasn't really seen it yet.....he may very well see it and say
"Pull that @#$!! thing off the net NOW!  Oh my God, I'm ruined."   =-D

It's at the top of my Birth of a Synth page here:

http://mypeoplepc.com/members/scottnoanh/slsdiy/id18.html

Cheers,
Scott