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From: JM <sunaecoNoChoppedPork@gmail.com>
Newsgroups: sci.electronics.design
Subject: Re: Final final 1kHz oscillator
Date: Sun, 17 Nov 2024 02:01:25 +0000
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On Thu, 14 Nov 2024 11:14:28 -0500, "Edward Rawde"
<invalid@invalid.invalid> wrote:

>"JM" <sunaecoNoChoppedPork@gmail.com> wrote in message news:t5fajjdteskfftvkf84iqsp2vc4b9ta5kj@4ax.com...
>> On Fri, 8 Nov 2024 15:43:41 -0500, "Edward Rawde"
>> <invalid@invalid.invalid> wrote:
>>
>>>This is the simplest circuit I can come up with.
>>>Harmonics are more than 80dB down in simulation.
>>>FFT the last 30 seconds.
>>>There is only one harmonic stopping me claiming 90dB but the exact FFT result can depend
>>>on exactly how much output is selected for the FFT. You may see different results.
>>>
>>>If a prototype is ever built, attention to the type and quality of the capacitors used will be needed.
>>>Electrolytics are not intended. Put C1 and C2 near U1 supply pins.
>>>Also pay attention to the stability of +/- 6V.
>>>It would be nice to have a single 12V rail version but so far I can't get it to work.
>>>
>>>R1 and R2 and probably R7 should be easily changeable.
>>>R3 should be 220 ohm ten turn. R9 should be 1M ohm ten turn in series with 470k.
>>>
>>>I don't fully understand why the DC stabilization circuit through U2B achieves what it does
>>>and this makes me concerned about whether a real circuit would have the same behaviour.
>>>It was added when I noticed that the diodes D1 and D2 weren't contributing equally so I
>>>decided to try to derive a DC correction signal. This was originally connected to the FET source
>>>and then to R13. Since this is a DC correction signal I decided to try out the effect of
>>>connecting it to U1 Vocm and was amazed that this works as well as it does.
>>>If you disconnect R5, harmonics will not be more than 50dB down because D1 and D2 are no
>>>longer providing stable and equal contributions to the level control feedback.
>>>
>>>If you need even better performance then the circuit referenced by Bill Sloman can be used.
>>>https://www.google.com/search?q=AN132+purity
>>>NSL-32SR3 is not expensive and simulation models exist but LT1468 is expensive.
>>>
>>>Other references
>>>
>>>https://www.google.com/search?&q=The+field+effect+transistor+as+a+voltage+controlled+resistor
>>>
>>>https://www.google.com/search?&q=sine+wave+oscillator&udm=2
>>>
>>>
>>>Version 4
>>>SHEET 1 2196 932
>>>WIRE -64 -672 -96 -672
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========== REMAINDER OF ARTICLE TRUNCATED ==========