Re: The low distortion oscillator problem

On 7/02/2025 7:35 am, JM wrote:

On Thu, 6 Feb 2025 16:47:10 +1100, Bill Sloman <bill.sloman@ieee.org>
wrote:
 

On 6/02/2025 4:08 pm, JM wrote:

On Thu, 6 Feb 2025 03:58:59 +1100, Bill Sloman <bill.sloman@ieee.org>
wrote:
>

There have been quite a few postings about 1kHz low distortion sine wave
oscillators.
>
The problem is that if you want a get stable output from a sine wave
oscillator you have to add a non-linear element to control the gain
around the oscillating circuit.
>

>
You don't'

>
Counter-example?
>
Clipping is a non-linear process. The most linear op amp becomes
non-linear as soon as its output hits the supply rails.
>
<snip>

Very funny, The sample and hold at A1 is an obviously a non-liner element, and B1 is even more obscure, but "limit" is a non-linear operation.
Saving only the nodes voltages you want us to pay attention to is a pretty transparent trick. I saved a few more - not enough to have a particularly clear idea of what you are doing, but quite enough to be confident that it isn't any kind of counter example.
--
Bill Sloman, Sydney