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From: JM <sunaecoNoChoppedPork@gmail.com>
Newsgroups: sci.electronics.design
Subject: Re: Final final 1kHz oscillator
Date: Wed, 20 Nov 2024 05:42:00 +0000
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On Tue, 19 Nov 2024 20:59:04 -0500, "Edward Rawde"
<invalid@invalid.invalid> wrote:

>"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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