[sdiy] Noninverting integrator / 2-opamp Biquad

[jhaible]

> Yes,
> right here:
>
> ftp://ftp.orban.com/672A/672A_Manual.pdf


Yes, that's it!

They have a long circuit description, *except* for the
resonator circuits. On this, they basically say it's too
hard to explain (;->).
I couldn't make much of it either when I looked at it
a few month ago, but now that I've learned about the
noninverting integrator, it suddenly looks very
familiar.

JH.