[sdiy] VCR - Voltage Controlled Resistor

[PRCamann at aol.com]

In a message dated 7/19/2004 5:50:19 PM Eastern Standard Time, 
cfmd at bredband.net writes:

> A state-variable filter is not built around low pass filters, it's built 
> around
> integrators. The standard (for synth cases) SVF is built from two 
> integrators
> and an input summer, you need the feedback paths to acheive the pole-pattern
> control. The outputs of the summer and the integrators can then be summed to
> form whatever zero-pattern you fancy.
> 
The SVF is also equivalent to an analog computer circuit solving a general 
second-order differential equation with damping and an input forcing function.   
That's how I remember how to wire it up.

Paul Camann
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