[sdiy] Moog ladder filter paper - now with added diodes!

[Scott Nordlund]

Excellent (if slightly masochistic)- I have long wondered about how the TB-303's mismatched capacitors affected its transfer function, particularly with increasing resonance.  I finally have an (unexpected?) answer!

But how about nonlinear analysis?  I know a (large enough) signal, superimposed on the control current, would change the operating point of the individual diodes/transistors (and thus the small-signal resistance).  Does this cancel out (since one side will go down as the other goes up...) or not?  

----------------------------------------
> From: tim102 at tstinchcombe.freeserve.co.uk
> To: synth-diy at dropmix.xs4all.nl; analogue at hyperreal.org
> Date: Sat, 25 Oct 2008 22:23:02 +0100
> CC: 
> Subject: [sdiy] Moog ladder filter paper - now with added diodes!
> 
> Hi lists,
> 	After a not inconsiderable amount of effort (it feels like I've been
> desperately trying to meet some college project deadline - it's taken weeks
> and weeks...) I have managed to update my Moog ladder paper, to be found
> here:
> 
> www.timstinchcombe.co.uk/synth/Moog_ladder_tf.pdf
> 
> and linked from:
> 
> www.timstinchcombe.co.uk/synth/synth_main.html
> 
> Not only does it now include some of the diode ladder configurations, but
> there is a shedload of stuff to do with poles and frequency responses etc.
> in there too (oh, er, and it has mushroomed from 6 pages to over 50 :-/  ).
> It is pretty heavy going on the algebra, but there is nothing too
> high-powered in there, and there are lots of pretty pictures too. (Also note
> that I have changed the title to reflect its more-encompassing content.)
> 
> If anyone spots any mistakes or out-and-out howlers in it, I'd particularly
> like to hear of them, thanks!
> 
> Regards,
> 	Tim
> __________________________________________________________
> Tim Stinchcombe 
> 
> Cheltenham, Glos, UK
> email: tim102 at tstinchcombe.freeserve.co.uk
> www.timstinchcombe.co.uk
> 
> 
> 
> 
> 
> 
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