vcf5t update

Benjamin Woenig budfts at eisa.net.au
Mon Mar 6 06:08:48 CET 2000


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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