[sdiy] IT'S ALIVE! Igor quick, the townspeople are coming with torches!

[Rutger Vlek]

Hi David,

Thanks for the info. This seems really promising. The filter still has amazing abilities with a relatively low parts count (and cheap). Have you also tried using it as an all pass filter or with multiple VCO's separately into the different inputs?

It seems the Synthacon VCF clone is moving back to it's original Synthasystem design then, since several people have been adding diodes or modifying the output stage. See for instance the latest CGS revision (http://www.cgs.synth.net/modules/cgs35_syntha_vcf.html) or the Yusynth version of it (http://yusynth.net/Modular/EN/STEINERVCF/index.html).

Best,

Rutger


On 9 feb 2011, at 20:09, David wrote:

> Hi Rutger,
> 
> In general, the Synthacon used simplified versions of the Synthasystem
> modules. There were cost concerns, so features were removed and the circuits
> were simplified.
> 
> In comparing the two schematics, the diode ladder in the Synthasystem used
> 10 diodes to the Synthacon 6, it has an additional output stage, and the
> feedback loop is different. I find the resonance to be much more friendly in
> the Synthacon filter. It still has a bite if you want it, but it can be
> dialed in with more control.
> 
> I have a CGS Synthacon clone, which is great, but I really like the
> Synthasystem filter better.
> 
> David
> 
> -- -----Original Message-----
> -- From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
> -- bounces at dropmix.xs4all.nl] On Behalf Of Rutger Vlek
> -- Sent: Wednesday, February 09, 2011 4:24 AM
> -- To: Synth DIY
> -- Subject: Re: [sdiy] IT'S ALIVE! Igor quick, the townspeople are coming
> with torches!
> -- 
> -- Hi David,
> -- 
> -- wow, that looks awesome! You did some amazing work there! A few days ago
> I found
> -- your video demo of the Synthasystem VCF. How exactly does it relate to
> the more
> -- common (for DIY) Synthacon VCF? Is it just a component differences? I
> have a
> -- Synthacon VCF clone in a DIY synth and I'm considering to build another
> one, but I'd like
> -- a better controlled resonance and less noise. When using the filter in
> LPF mode, it seems
> -- that unconnected HPF and BPF inputs pick up noise. Grounding them only
> partly solves
> -- the noise problem.
> -- 
> -- Rutger
> -- 
> -- 
> -- On 9 feb 2011, at 04:10, David wrote:
> -- 
> -- > Well, I officially pronounce the Synthasystem alive and kicking! Nyle
> helped
> -- > me get the Ring Modulator working today (bad batch of chips) and that
> was
> -- > the last module. The panels are all done and now, I can actually finish
> -- > building my own Synthasystem.
> -- >
> -- > A very big thank you to all who offered help, advice, and
> encouragement.
> -- >
> -- > The web site is sorely behind, but I'll get it updated over the next
> few
> -- > days and I'll add some more build photos and watch for more videos.
> -- >
> -- > David
> -- >
> -- > http://www.xmission.com/~dingebre/Synthasystem.html
> -- >
> -- > "... and there was much rejoicing"
> -- > (Monty Python and the Holy Grail)
> -- >
> -- >
> -- > _______________________________________________
> -- > Synth-diy mailing list
> -- > Synth-diy at dropmix.xs4all.nl
> -- > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> -- 
> -- _______________________________________________
> -- Synth-diy mailing list
> -- Synth-diy at dropmix.xs4all.nl
> -- http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>