[sdiy] tri VCO for Ring Mod?

[harrybissell]

Actually... I think you can order them from Jim Patchell  :^P

(so my swipe about him being a 'stockholder' actually has a grain of
truth :^)

iirc there are some details on his website. He bought a bunch so that he
could get quantity pricing, and passes the savings along. I have done a
few deals with him and trust him like my "twin-brother-separated-at-birth"...

H^) harry

If the 2N3808 is a monolythic dual, Its probably quite usable. The MAT03 is
really
a top shelf device !

Michael Ruberto wrote:

> I never see anybody selling THAT products. Do you have to order them from
> China or something?
> And has anybody else had the experience of having sales people from American
> Microsemi sending you 5 emails a day trying to get you to order from them?
> Rather agressive bunch.
>
> I'm liking the Bergfors design at the moment due to the lower parts count. I
> ws thinking about my local electronics parts place and how they have a bag
> of 2N3808 collecting dust in the back of their store room. I know they
> aren't as tightly matched as a MAT03 but do you think they would be worth it
> for this application?
>
> M. A. Ruberto
>
> >From: harrybissell <harrybissell at prodigy.net>
> >To: James Patchell <patchell at cox.net>
> >CC: Michael Ruberto <frankentron at hotmail.com>, synth-diy at dropmix.xs4all.nl
> >Subject: Re: [sdiy] tri VCO for Ring Mod?
> >Date: Fri, 23 Dec 2005 21:21:55 -0500
> >
> >Bold words from Jim Patchell (THAT stockholder)   :^P
> >
> >but seriously folks, the 2SA798 is a good, reasonably cheap
> >PNP monolythic pair. Last time I bought (100's) they were in the $.35
> >range. Probably more now... but should still be under a buck. I forget
> >who I ordered from.  Maybe Old Crow remembers... but I don't even
> >remember if he bought the NPN and I bought the PNP... anyway we traded
> >some.
> >
> >American Microsemi was one source...
> >
> >H^) harry
> >
> >James Patchell wrote:
> >
> > > You can also use an OTA for doing the current steering..., the one of
> >Fritz
> > > site is a good design...(not to say that Bergfors isn't...I just haven't
> > > seen it).  I have also used THAT140s (Now THAT340s) to do the same
> > > thing.  They work pretty good.
> > >
> > > At 04:56 PM 12/23/2005 -0500, Michael Ruberto wrote:
> > > >Hello,
> > > >
> > > >Since I came into possesion of a lot of AD632 multipliers I am thinking
> >of
> > > >building a nice stand-alone Ring Mod effect box. I would like the unit
> >to
> > > >include a carrier VCO with sine and tri waves. I have been searching
> >for
> > > >triangle VCO designs and saw some nice ones from Fritz and Bergfors.
> >Has
> > > >anybody else tried constructing these?
> > > >
> > > >Anyone know of a tri core VCO that doesn't require expensive matched
> >PNPs?
> > > >Or how about some inexpensive matched PNPs?
> > > >
> > > >Also I would love some more ideas for features to add to my effect.
> > > >
> > > >Thanks!
> > > >
> > > >M. A. Ruberto
> > > >
> > > >PS: Merry Christmas!!!
> > > >
> > > >
> > >
> > >          -Jim
> > > ***************************************************************
> > > http://www.oldcrows.net/~patchell
> > >
> > > ***************************************************************
> >