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VC Steiner vcf poles

VC Steiner vcf poles

2005-01-24 by d2leo57

Hi

I am new to the list and new to diy stc..


I am wondering how I can get VC control to the poles in the Steiner
filter similar to Wiard's boogie filter.

Phil

Re: VC Steiner vcf poles

2005-01-25 by Mike Marsh

Hi Phil -

If you mean Wiard's 1200 series Boogie, then I don't belive you can
"control" the poles via VC: the jacks are for output. You can access
each pole individually this way...

Mike
Show quoted textHide quoted text
--- In cgs_synth@yahoogroups.com, "d2leo57" <pditullio@b...> wrote:
>
> Hi
>
> I am new to the list and new to diy stc..
>
>
> I am wondering how I can get VC control to the poles in the Steiner
> filter similar to Wiard's boogie filter.
>
> Phil

Re: VC Steiner vcf poles

2005-01-25 by d2leo57

Hi Mike,

I am really new to this. What I think I am trying to say is there a
way I can control all the poles with say a JAG and a joystick?.If
not is there some way to modify this circuit to do this?

If I understand it correctly Charlie Lamm has a mod that he adds 2
linear VCAs to do this.Is there any other (easier)or more efficient
way to do this.


Phil

Re: VC Steiner vcf poles

2005-01-25 by Mike Marsh

Ahh, gotcha. So you would take the outputs of the 4 pole jacks and
control them with a Jag and a Joystick, right? Charlie is right:
you'll need (as I count them) 4 VCAs, one for each pole. The output
of the Jag would control the amount of CV into each VCA and thus the
volume of each pole. I don't see another way to do this: even VC
controlled mixers use VCAs, I think...
Show quoted textHide quoted text
--- In cgs_synth@yahoogroups.com, "d2leo57" <pditullio@b...> wrote:
>
> Hi Mike,
>
> I am really new to this. What I think I am trying to say is there a
> way I can control all the poles with say a JAG and a joystick?.If
> not is there some way to modify this circuit to do this?
>
> If I understand it correctly Charlie Lamm has a mod that he adds 2
> linear VCAs to do this.Is there any other (easier)or more efficient
> way to do this.
>
>
> Phil

Re: VC Steiner vcf poles

2005-01-28 by Phil

Hi Mike,

Thanks for the info I am learning slow but sure.

One other question can this also be accomplished using OTAs?

Phil

Re: VC Steiner vcf poles

2005-01-30 by Mike Marsh

Here's the quick answer: I don't know! :) I don't design these things
because I don't have those chops. I work one level up, so to speak.

On the other hand, I don't see why not. You just need a way to mix
signals...

Check out the Wiard Yahoo group. There is a small discussion on this
very topic going on, and you'll find folks that can answer your
question at a deeper level.

Mike
Show quoted textHide quoted text
--- In cgs_synth@yahoogroups.com, "Phil" <pditullio@b...> wrote:
>
> Hi Mike,
>
> Thanks for the info I am learning slow but sure.
>
> One other question can this also be accomplished using OTAs?
>
> Phil

Re: VC Steiner vcf poles

2005-02-01 by charlesosthelder

Hey Phil!

An OTA used as an input buffer with a linear current control source
would be an easy way to control the audio inputs to the poles. A
very fun tutorial for experimenting with OTA's in synth circuits can
be had from Thomas Henry. Check out http://www.midwest-analog.com/
for a list of his books and other products.

Any simple VCA could do the job as well, if you wanted to "keep it
modular" (K.I.M.?) and allow for maximum flexibility. Perhaps if you
built a triple or quad VCA to facilitate that sort of control over
the Steiner/Stone VCF, you'd be happier with the system overall. The
VCA's could then be modulated by any source - EG, joystick, what-have-
you.

BTW - I think Ken's Steiner VCF is one of the most fun filters
around! Modulating the inputs will definately coax some strange
noises from from it. Not that you need to work too hard at doing
that!
Show quoted textHide quoted text
> --- In cgs_synth@yahoogroups.com, "Phil" <pditullio@b...> wrote:
> >
> > Hi Mike,
> >
> > Thanks for the info I am learning slow but sure.
> >
> > One other question can this also be accomplished using OTAs?
> >
> > Phil

Re: VC Steiner vcf poles

2005-02-02 by Phil

Thanks for some direction.I am still quite green and looking for
some place to gather info to put it all together. This query started
with a great mod I found by adding 2 dual linear VCA boards to Ken's
Steiner VCF.
http://www2.charlielamm.com/synth/steiner/index.php

Which got me to see how else can I get control of the Steiner poles.

Great info thanks,
Phil

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