[sdiy] An Improved Sine Shaper Circuit

[Uwe Schueler]

thanks Don for sharing this, very interesting !

do I get this right: the physical circuit is the old tanh-circuit (w.  
OTA or diff pair) with cusp cancelation.
But you discovered a very elegant way to calculate it ?

your circuit:
tsin(x)  = 9tanh(0.3833x)−2.449x

OTA w. cusp canc. (openmusiclabs otadist fig.7/11 :
ccsin(x) =  tanh(overdrivefactor*x) - cuspfactor*x