[sdiy] Sine VCO

["Rönnberg, Niklas"]

I'm looking for a sine VCO. I don't want (or need) any other waveform from
this VCO, but I guess that that is unavoidable. I also want the VCO to have
an input for FM...
I think that I saw a schematic once that was based on a LM13600. This VCO
made a triangle wave, so maybe this would be a good start for a sine
VCO(?).

Can anyone help me pointing out a schematic or giving a tip on designing
this circuit?

Regards,

Niklas