>However, I prefer audio outputs to
> be centered about zero. Capacitors in the range of 100nf to1uf placed
> in series with R37, R38, and R39 would do the trick for centering the
> tone and ring mod outputs.
One nice thing about the direct coupling of the audio outs is that they make really great modulation sources themselves. Try feeding them into your favorite VCO or VCA.
>I used a 1K for R35, as well.
> This makes the LF398 more stable when it is reading its own output
> (cluster pot wiper all the way over to R35).
Thanx for the tip. I'll give this a shot.
Thanx to Grant for designing this amazing circuit. I really enjoying this module.
Tony
>
> Richard Brewster
> http://www.pugix.com
>
> Mark wrote:
> > On 3/1/08, Grant Richter put forth:
> >
> >> > Also, I took a look at the schematic. According to the above
> >> > website, this module uses 0 - 10V, and I wanted to see how easily it
> >> > could be adapted to the -5V/+5V that MOTM generally uses. It looks
> >> > like all the op-amp outputs are wired as comparators (ie. with
> >> > positive feedback). If that is a mistake, perhaps it should be
> >> > corrected.
> >>
> >> Orcad library op-amp symbols have the minus input on the bottom, and
> >> the positive input on the top, don't ask me why. Don't assume
> >> op-amp symbols are always drawn with the negative input on top, it
> >> has become conventional recently, but different schematic software
> >> may not follow that convention, and there are no regulatory bodies.
> >>
> >
> > These are drawn according to that convention, with the negative input
> > on top. It's labeled with a "-" and the number 2 (which is an
> > inverting input on a TL072). The feedback goes from the output
> > (labeled 1, which is an output pin on a TL072), along the bottom, to
> > a an input labeled with a "+" and the number 3 (which is a
> > non-inverting input on a TL072). So I don't think I'm assuming
> > anything in suggesting that if it isn't meant to be a comparator,
> > then perhaps the schematic should be corrected.
> >
> > http://diy.czmok.de/mod/gbuy/wogglebug-schem.pdf
> >
> >
>
>
>
>
>
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