SV: Re: [sdiy] New and Improved Buchla waveshaper analysis

[karl dalen]

--- Grant Richter <grichter at asapnet.net> skrev:

> > Here's my new rendition of the nonlinearity from the timbre  
> > circuity of the Buchla 259 Programmable Complex Waveform Generator:
> >
> > http://users.ece.gatech.edu/~lanterma/buchla_nonlinearity.png
> >
> 
> With all due respect, any thing using a diode will never give a  
> transition that sharp. And anything using a real op-amp with
> finite output impedance will never give a transition that sharp.

I dont know if this has been said (previously)if it has
i merly repeat it here, the CA3160 are not a real OP amp
in one sence,the CA3130/3160 and 3260 is one OP amp 
unipolar or bipolar "perfect shaping" saw to triangle
converter! 

All you need is two resistors and the OP amp
to make a perfect triangle converter, wave 
goodbye to diode and transistor shapers!

If you feed a sawtooth into it at 1,4 volt "below" 
supply it phase reverse perfectly linearely!

To do this keep gain ratio fairly high.
Dont capacitively load the output to keep 
the wave clean.

Reg
KD