[sdiy] tri VCO for Ring Mod?

[Michael Ruberto]

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
> >
> > ***************************************************************
>