vcf5t update

Theo Hogers t.hogers at home.nl
Mon Mar 6 02:23:13 CET 2000


This looks very cool indeed.
I'm gona build one for testing, and since its faster to make a PCB than to
use perfo print....
Expect a PCB within a day or two (Ultiboard format).

Cheers  Theo


----- Original Message -----
From: Harry Bissell <harrybissell at prodigy.net>
To: Benjamin Woenig <budfts at eisa.net.au>
Cc: tomg <efm3 at mediaone.net>; DIY <synth-diy at mailhost.bpa.nl>;
<efm at xavax.com>
Sent: Sunday, March 05, 2000 5:43 PM
Subject: Re: vcf5t update


> This looks like a job for...... EWB!!!
>
> Can you say... Bode plots ???
>
> A cool looking filter... how is the CV rejection??? Major thump with
> step change...
> or not so bad ???
>
> H^) harry
>
> Benjamin Woenig wrote:
>
> > Here's and idea Tom! Would be nice to see a quad filter PCB
> > using that design!!!
> >
> > ~bud (soldering iron warming up)
> >
> > > A "real" filter with only 3 transistors??? One of our members
> > > asked me to see if  I could get this filter to work in his current
> > > project. Well...I wasn't successful doing exactly what he
> > > wanted ..but I  did something even better (for the rest of us
> > > anyway).... I removed the opamp all together! Instead using
> > > a pair of inverting transistor amps.
> > >
> > > The coolest thing is it works soooo much better!! That kill
> > > the neighbors dog , split the sky oscillation is gone. The
> > > cutoff response is very smooth. You can easily sneak up
> > > on the res advancing to full on without fear you are about
> > > to blow your speakers and when it does self oscillate it's
> > > even (more or less) across the entire res sweep.
> > >
> > > The update is here. You guys should build one today!
> > >
> > > http://www.xavax.com/efm/cbook/pics/vcf5t-sd.gif
> > >
> > > Tom
> > >
> > >
> > >
>




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