[sdiy] Roland System 700 VCF

[Stewart Pye]

Hi,

I've been looking at the System 700 VCF schematics with the thought of 
designing a circuit based on that but using the SSM2164.
Sys700 Schematic here....   http://fa.utfs.org/diy/roland700/703e_a3.jpg

It's a 4 pole OTA into integrator design. The output of each integrator 
is fed back via a 22k resistor to the non inverting input of the OTA for 
that stage. Does this mean that for the filter to NOT oscillate it needs 
overall negative feedback from the output to the input? I think this is 
being done in the resonance control in the Roland circuit...

I'd appreciate it if someone could clarify this for me. I may be way off....

Regards,
Stewart.