2nd generation VCFs (was: Xpander VCF)

[jh.]

> Right. I would strongly advice you to read the patent behind the SSM
> 2044. It is US Pat. 4,404,529. That patent expired in 1995 BTW, so
> it's content is out for grabs!

I guess I have to confess something: I have the patent paper for years,
but I never read it. Just looking at the pictures. I thought everything
was clear, and I never bothered about reasons for a different final
stage. So there is a description about that HF bleedthru in there ?
Funny !

> Juergen or someone else should find it easy to conver a lump of BC550
> and BC560 (or 2N3904 and 2N3906 for our american listeners) into a
> full-fledged filter.

I thought most of that "folding" the cascade into current mirrors was just
about fnding a way around the Moog patent. (?) Easy to have such a huge
number of matched transistors on a chip, but a pain to match so many
discrete devices.

> Go and read the patent.

I will ! (;->)

JH.