newbie's first VCF design. help please!

Darren.Inwood.1 at uni.massey.ac.nz Darren.Inwood.1 at uni.massey.ac.nz
Fri Aug 22 01:24:35 CEST 1997


okay, will this do what I want it to?  if i'm obnoxious please tell me. 
i don't know exactly how a cv could be used here, what kind of voltages
produce what kind of resistances on a FET etc.
if anyone wants to tutor me they're quite welcome!!! (mmm-hmm.)
i think this should provide a path to ground for the higher freq's
(choose better c1&2 value) but won't that change the depth as well as
the frequency?
:)
thanks
---------
darren
follower of the envelope!

o-----------------------*---------------o
 +Vcc      V C F ?      |                             
           =======      |                    
         10k          |\| TL-071etc...
  o--*--\/\/\---------|+\__*____________o                             
input|         ,--||--|-/  |      |    output
     |         | 6.8nF|/|  < 4k7  |                    
     >         |  C1    |  >      |      
 100k<         |        |  |      >       
     >     |---*----||-----"      < 10k  
  o--|-----|---.   6.8nF|         >      
  cv |    FET  |    C2  |         |     
o----*---------*--------*---------*-----o
 0V       2N3819etc
oh yeah, you need a fixed-width font like courier to see ascii art.



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