[sdiy] tri VCO for Ring Mod?

[harrybissell]

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