[sdiy] random thought about sine shapers

[David G. Dixon]

Well, I just simulated the effect, and the transistor-based sine shaper will
not give a square at the extreme, but rather a strange looking square-ish
wave with a square bottom and a triangular top.  I'll have to try it at home
and see.  It could be that a 13700-based approach is better, since then the
spare 13700 could be used as the VC resistor.

> This is where using an overdriven OTA as a sine shaper is good:
> if you keep cranking up the input, you get a progressively more
> squared off output.
> So you can, by increasing input level, go from triangle thru sine to
> square,
> The output level increases a bit as you do this, but not all that much.
> 
> Of course, overdriving an 'ordinary' sine shaper would give a waveform
> change as well.