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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: High purity 1kHz oscillator
Date: Fri, 25 Oct 2024 15:25:07 +1100
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On 25/10/2024 4:48 am, JM wrote:
> On Thu, 24 Oct 2024 16:16:49 +0100, JM <sunaecoNoSpam@gmail.com> wrote:
> 
>> On Wed, 23 Oct 2024 02:05:52 +0100, JM <sunaecoNoSpam@gmail.com> wrote:
>>
>>> On Tue, 22 Oct 2024 01:10:41 -0400, "Edward Rawde" <invalid@invalid.invalid> wrote:
>>>
>>>> But I suspect that component tolerances and mismatched FETs will ruin it.
>>>>
>>>> Otherwise it should be easy to get 60dB down on unwanted harmonics with a better filter.
>>>>
>>>> FWIW I likely won't be here for the next week.
>>>>
>>>
>>> If you actually need a low distortion oscillator look for Viktor Mickevic's designs on diyaudio.   I've attached a schematic.
>>>
>>> PK
>> 
>>
>> It seems that I have a problem posting encoded binariesto this group with my provider.  Attached is a link instead.
>>
>> https://1drv.ms/u/c/1af24d72a509cd48/EakMPPRi-pdLgaAKtJ2rrwwBNMGZZsy84MV2QoH1dPcZJQ?e=o59V9a
> 
> And that links to an incorrect schematic - the rectified output tap is connected to the wrong node.  Might be other errors..

Even so, the third harmonic is 78dB below the fundamental. The 
simulation runs slowly on my computer, so it may take me a while to get 
the schematic to where the designer intended it to be.

The choice of op amp is what I'd expect from an audio group - it does 
seem to be a low distortion part.

I just seem to have wrecked the .raw file from the simulation, so it may 
be a while before I have more to say.

-- 
Bill Sloman, Sydney

-- 
Bill Sloman, Sydney