SV: Re: [sdiy] Much progress on Buchla waveshaper analysis

[Ian Fritz]

At 08:36 AM 11/21/05, Grant Richter wrote:

>>I plan to explore other waveshapers at some point; right now, my
>>prime goal was to understand and model that specific Buchla
>>circuit, with the idea of making a software model of the Easel.
>
>Please extend the research to make something new and better. That is
>the only justification for duplicating the prior art.


Hear, hear!

Here's an idea I haven't seen before:  A half-folder.  It is monotonic for 
negative input voltages and folds over for positive ones.  Should have 
relatively stronger even harmonics than the more common symmetric folders.

A circuit like I recently gave for the non-linear limiter of the 
Hopf-bifurcation quad oscillator acts as a symmetric folder.  To make it a 
half folder, just replace one of the zeners with a regular signal 
diode.  This would give a response mimicing x(1-x) rather than 
x(1-x^2).  And the two responses could easily be mixed!

http://home.earthlink.net/~ijfritz/xfer.htm

   Ian