[sdiy] Roland System 700 VCF

[Veronica Merryfield]

On 2010-07-10, at 3:11 PM, Oren Leavitt wrote:
> Looks like IC1 implements voltage-controlled resonance.
Agreed

> The OTA being a high-impedance current-out device is likely just adding a little output feedback as a current to the input summing node at IC2.

The output stage of the CA3080 is shown as a push-pull class A output so I assumed it would be a low output impedance so I went back the spec sheet to check and it quotes 15M output resistance.