[sdiy] Fwd: VCO - sine output - why bother?

[Neil Johnson]

David wrote:
>> Yes, this is true, but the sine waves need to be limited.  I use
>> back-to-back zeners off the feedback loop for this
...
>> If you want really really clean quadrature
>> sines using this technique, it is best to go to 8 stages (requiring two
>> 2164s) and take the 6th and 8th sines.

Seems like overkill.

Ben wrote:
> If you want to go a little more 'advanced' with a low distortion sine
> wave oscillator, you can do a lot better than using zener diode
> limiting for the amplitude.

Indeed.  Are you familiar with the work of Phil Macphail?
http://www.liivatera.com/Downloads/

Neil