AW: LM13600 VCA, latest news

[Haible Juergen]

	>I changed the "Serge" circuit according to JH's recommendations. 
	[...]
	>The linearity of the output is still clearly not as good as the
"normal" 
	>circuit, from the NS datasheet. 
	[...]
	>Conclusion 
	>is that the circuit from the NS datasheet really is as good as this
chip will 
	>get. 

Well, I'm almost convinced now. The designers of some chip should
know it's behaviour better than anybody else, after all ...
You really made me curious, and I think I will put a linear ramp at 
my Morphing Programmer's VCAs again, when I find the time.
One last question: Did you look at the negative supply voltage of
the Serge circuit? I mean *theoretically* there could be a source of
distortion, too. How "hard" is your power supply ?

JH.