AW: tomg vcf9a_sd

[Dr. Jörg Schmitz]

> >The problem is : I have found an offset at the lowpass output
> >which is dependent on the CV input (filter frequency control) :
> >low frequency : going down to -15 V
> >high frequency : going up to +15 V.
> 
> I suspect that if you use the LM13700 (or equiv) rather than 
> the LM13600,
> the problem will be a lot less.
> The biassing of the output buffer changes with level of input 
> signal in the
> LM13600.
> Not what you want in this circuit.
> 


I use the NE5517N, and I found 3 specs for this NE-device, 
all of them with the note, that it is TOTALLY equivalent to 
the 13600. Is that not true, perhaps ?

J.S.