TomG's VCF9a

[tomg]

> > > IMO, it cannot work the way it was designed.
> > > Look at the loop gain around the inverting adder, noninverting integrator
> > > and inverting 2nd integrator.
> > > 
> > > (Switch pins 13 and 14 of the 13600 and you have the familiar Oberheim
> > > scheme.)
> > > 
> > > Strange that it's in the layout, too, so it can hardly be a typo.
> > > Does anybody test these layouts before they get published ??
> > > (Sorry Tom, no flames intended. But do you actually *build* all this stuff
> > > yourself ?)
> > > 
> > > JH.
> > 
> > I think your opinion is wrong. 

But as usual...and I should have known! You are correct. I reversed the pins.
The only thing I can think of is I built it wrong had to fix it and then redrew it
wrong again I remember I had a problem with it......well there goes my zero 
mistake state....Like there ever was one..;-)  

Jorg the fix is reverse pins 13 and 14 and it should go. Sorry for the hassle.

-tg