Can we improve this low distortion sine oscillator ?

[paba]

sometimes you need precise amplitude AND a clean sinewave...

<0.003% distortion and 0.1% amplitude stability, you will need to change some passives to get 1khz.

http://tinyurl.com/ce65re

cheers
paba

 

[syn08]

Any opinion on this circuit:

http://home.att.net/~theremin1/Circuit_Library/twin_t_oscillator.html

I built it as a 500hz sine source (yeah, 1khz would have made more sense!) from bits I had around and it sounds and looks (on a scope) very pure. I used polystyrene capacitors. Used for testing max power output from an amp and checking for any obvious distortion or ringing.

The AGC loop looks stupid. Thanks God you you can't measure the spectral purity of this oscillator. Otherwise, I'm sure it sounds as good as any ppb distortion oscillator.

 

[scott wurcer]

sometimes you need precise amplitude AND a clean sinewave...

<0.003% distortion and 0.1% amplitude stability, you will need to change some passives to get 1khz.

http://tinyurl.com/ce65re

cheers
paba

We did one along these lines in 1994 http://www.edn.com/archives/1994/111094/23di3.htm

Any resemblance to the Bateman article is purely coincidental