vcf5t update

Harry Bissell harrybissell at prodigy.net
Sun Mar 5 17:43:53 CET 2000


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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