SV: Re: SV: Re: [sdiy] Aries expoconv, Terry Mikulic,Terry Michael.

[karl dalen]

--- harry bissell <harrybissell at prodigy.net> skrev:

> karl dalen wrote:
> >> The Aries expo is like the one on the
> >> Arptech site for the SVF filter (forget the
> >> number)
> >>     
> > You meant the 4023,  dual current sourcing with balance?
> > Does AR 317  (VCO) have the same expo as the AR 314 (SVF)?
> >   
> AFAIK it does... the second current source is used for the sawtooth... 
> which is a second
> cap driven from the expo and sync'd to the triangle

Yes i was looking trough archives and found  that it had been discussed
in the past but i tought the AR317 expo was one sink and one source
the sink was for the saw gen but  as it apperas both are sourcing.
Seams most resonable to use the same expo for SVF and VCO 
if both needs sourcing.
 
> Pretty clever design imho

One can do the same with NPN expo, just split the CV
and have suboctave saw and triangles, whatever.

KD

> 
> H^) harry
> > http://www.till.com/arptech/modmain.htm
> >
> > KD
> >  
> >   
> >> The expo on the Moog ladder is essentially the same
> >> but reverse current direction
> >>
> >> H^) harry
> >>
> >> --- karl dalen <dalenkarl at yahoo.se> wrote:
> >>
> >>     
> >>> Anyone who have a picture of  Terry Mikulic's
> >>> NPN-PNP
> >>> circuit as published in Electronotes.#37 page 2? 
> >>>
> >>> Is it similar to JHs expo?
> >>>
> >>>       
> >> http://home.debitel.net/user/jhaible/jh_expo_source_sink.gif
> >>     
> >>> KD
> >>>
> >>>       
> >>     
> >
> >
> >
> >   
> 
>