[sdiy] Tau Systems

[lanterma at ece.gatech.edu]

I know Juergen Haible did a lot of work with the Tau Pipe phaser, but the only other reference to Tau Systems I've been able to find is on Jim Patchell's website:

http://www.oldcrows.net/%7Epatchell/TAU1010/tau.html

And speaking of transistor ladder VCFs using PNPs, the Tau 1010 is one!

The Tau 1005 is a triangle VCF (OTA-comparator type), and the 1050 looks like a sawtooth VCO (I think).

Anyway, I was curious if anyone was familiar with the company? My google fu is failing at finding more information... most hits that come up involve either Juergen's version of the Tau phaser or a line of unrelated softsynths by Muon.

I'm also casually curious if there are more PNP-based transistor VCFs out there, and for that matter, why one would choose to use PNPs instead of the more common NPNs in that topology?

- Aaron