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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Final final 1kHz oscillator
Date: Tue, 19 Nov 2024 20:59:04 -0500
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"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vhibce$1t7v2$1@dont-email.me...
> On 18/11/2024 2:58 pm, Edward Rawde wrote:
>> "JM" <sunaecoNoChoppedPork@gmail.com> wrote in message news:n7iijjdeqecl0kmub0bq5in0dbm60m7qam@4ax.com...
>>> 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:
>
> I've taken John May seriously, and reworked my phase shift oscillator to use three op amps, all with their non-inverting inputs 
> tied to ground.
>
> The results aren't all that impressive, the lower harmonics are about 65dB below the fundamental. Start-up is slow - it takes 
> about five seconds of simulation before the circuit settles down into steady state operation, and that after I dropped the 
> integrating capacitor from 6.8uF to 680nF. The nice thing about the circuit is that I can explain what each bit is doing. I can 
> see a few tweaks that might be worth trying.
>

The simulation died after 3 seconds, as if insufficient gain to sustain oscillation.

You seem to have a lot of components.
Are you sure you really need all those ferrites?

Here's my really definitely final final offering.

A comfortable 90dB down at 2kHz and > 100 dB elsewhere.
Also looks clean either side of 1kHz.
Whether or not this has anything to do with reality I do not know.
The diode stabilizer string will be temperature dependent,
requiring readjustment of R4 and a total of three adjustments are needed.
Only three op amps (two packages) are needed.

Version 4
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