Cgs synth

Thanks for this tip. The circuit is working ok off 9v, but it's starts
oscillating when the frequency control is at maximum. Is there a
resistor value or something I can change to prevent this from happening?

sasami@... wrote:

>
> Hang some electros across your new voltage divider reference to
> decouple it,
> and use that as your "ground" for the other components.
>
> >Hi,
> >
> >On the subject of the band pass filter, I was looking at this circuit
> >today and was wondering if it could be powered from a single supply? I
> >assume the + op amp inputs could be connected to a voltage reference of
> >half the supply (using two equal value resistors) but what about the
> >other ground points such as the 4.7k and 15k resistors?
> >
> >James
> >
> >Mark wrote:
> >>
> >> On 6/2/07, Larry T. put forth:
> >> >I just need to find a small, simple envelope follower...)
> >>
> >> You can just wrap a full-rectifier around an op-amp followed by a
> >> one-pole LPF (a cap going to ground). There are numerous examples of
> >> various effects containing this sub-circuit on the web.
> >>
> >> You might find this article interesting:
> >>
> >> http://www.geofex.com/Article_Folders/noteproc/noteproc.htm
> <http://www.geofex.com/Article_Folders/noteproc/noteproc.htm>
> >> <http://www.geofex.com/Article_Folders/noteproc/noteproc.htm
> <http://www.geofex.com/Article_Folders/noteproc/noteproc.htm>>
> >>
> >>
> >
> >
> >
> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> <http://www.cgs.synth.net/>
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
> __________________________________________________________
> Ken Stone sasami@... <mailto:sasami%40hotkey.net.au>
> Modular Synth PCBs for sale <http://www.cgs.synth.net/
> <http://www.cgs.synth.net/>>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/
> <http://www.blaze.net.au/%7Esasami/>>
>
>