floating inductor simulation?

gstopp at fibermux.com gstopp at fibermux.com
Thu Nov 30 01:09:15 CET 1995

     Hi Juergen,
     I have very little experience with inductors, and so I have no good 
     advice for you. Good luck simulating Hammond parameters - I keep my 
     Hammond around because the thought of trying to simulate any of its 
     complexities frightens me. BTW might this be related to your 
     discussions about simulating the mechanical vibrato scanner on the 
     Hammond list? If you want to simulate reflective effects also, I can 
     only imagine the use of small coils of wire. :-)
     - Gene

______________________________ Reply Separator _________________________________
Subject: floating inductor simulation?
Author:  Haible_Juergen#Tel2743 <HJ2743 at denbgm3xm.scnn1.msmgate.m30x.nbg.scn.de>
at ccrelayout
Date:    11/29/95 10:50 AM

Hi Don / Gene / DIY-List!!
For an emulation of the Hammond Vibrato, I need 
a lot of Inductors in the 500mH range.
I thought about building them with gyrators, but I don't have 
the right circuit so far.
I know that simulating a *grounded* inductor is quite 
easy - done it many times for EQ circuits with the simple 
one-opamp circuit that has some parasitic effects.
Now for the *floating* inductors that I need, I only know 
a circuit with 2 gyrators. It uses 4 opamps and many 
resistors, and I wonder if there is another way to to it! 
I mean, is there any other circuit for floating inductors 
with less components? I don't need a hyper-ideal 
inductance, I could live with the kind of RC in parallel 
like it is in the simple 1-opamp grounded inductor.
Any ideas, any hints?
I am really blind concerning this, and all the good books I 
have seem to be blind here, too.
Or would it be better to use a R-C-superC structure instead 
of a RLC ladder? But I don't have experience here, too ... 
(And no, common filters won't work, as I need reflectet waves 
from the end of the ladder as well!)

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