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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: Final final 1kHz oscillator
Date: Wed, 20 Nov 2024 02:37:47 +1100
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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.

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