[sdiy] Sine VCO

[Tim Ressel]

Hi,

The way I would do this is to make up a sine
oscillator using 2 integrators in a loop, and put a
pair of OTAs in to control the integration rate. This
would be akin to making a state-variable filter
oscillate. There is a schematic in Jung's Opamp
Cookbook in the oscillator section for basic sine
oscillator.

--Tim

--- "Rönnberg,_Niklas" <nikro at itn.liu.se> wrote:
> 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
> 


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