stand-alone res. filter

[Christian Oncken]

These are great, but if your'e looking for something a little more simple 
try to find the book "Electronic Projects for Musicians" by Craig 
Anderton (I think).  Anyway, its got lots of great stuff like distortion 
boxes, compressors, ect, and a device called the "super tone control".  
Its a non voltage controlled filter, so its real simple, and also it sounds 
great. It has knobs for mixing hipass, lopass and bandpass responses, you 
can also get a notch out of it.  Plus knobs for resonance (it self 
oscillates) and frequency.  Runs on a 9v battery.  Its just a quad 
opamp, 5 pots/knobs, and a handfull of resistors and caps.  The book 
even provides a pcb layout.  A friend built one for me about 2-3 weeks 
ago, he said it was a total of $30 to make: box, parts, jacks, pots, 
knobs and all.  I've been running drum machines and a cz101 thru it 
nonstop since I got it.  

I want to build about 5 of these and make myself a cheap little parametric 
eq.  But I dont know how to make it stereo.  ???

Christian Oncken


> 
> Juergen's Wasp VCF clone will run off a single 9V supply:
> 
> http://www.it.kth.se/~e93_mda/synths/friends/haible/hj_wasp.html
> 
> Also, there's an EG and LFO that he designed to go with it:
> 
> http://www.it.kth.se/~e93_mda/synths/friends/haible/hj_sch.html
> 
> Tom made a single supply version of the EMS diode ladder that you might look at
> too:
> 
> http://www.synthesist.xsystem.net/efm/maxx/page_033.html
>