From obxwindsurf@yahoo.com Mon Sep 29 18:48:09 2003
Subject:Re: Solid State scanner project

Randall,

The values I'm going to be working with are the same in each leg of
the vibrato line: 33mH and .047uf metal film cap. My delay line
consists of 17 LC networks (nodes) in series with taps at "dry" and
after nodes 1-11, 14, 16, 17.

V1/C1 switches nodes 1-9 to the scanner
V2/C2 switches nodes 1-3, 5, 7, 9-12
V3/C3 switches nodes 1-3, 7, 10, 11, 14, 16, 17

I've heard samples of V1-3 and don't care for the way they sound and
will probably use C1-3 most often.

The main difference between Jurgen's circuit and mine is largely the
redesign to replace all the discrete transistor design with IC op-
amps. I never did understand why engineers in the age of IC analog
and digital circuits dedicated so much of their design to discrete
components. Having spent a good 10 years of my career entirely in A
& D integrated circuit designs, I haven't found a design yet that
was better performing or more easily carried out in discretes. With
a quad op-amp in a 14 or 16 pin package, even the board real-estate
argument wins.

I decided this design to be my next project as my Yamaha has what
comes very close to a C2 or C3 effect in its DSP's "Rotary 1"
setting, but the scan RPMs are too slow to simulate a Hammond C2 or
C3 chorus.

Good luck with your design!

Best regards,
Kevin