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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: Final final 1kHz oscillator
Date: Fri, 22 Nov 2024 17:06:17 +1100
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On 21/11/2024 1:00 am, Bill Sloman wrote:
> On 20/11/2024 2:03 pm, Edward Rawde wrote:
>> "Bill Sloman" <bill.sloman@ieee.org> wrote in message 
>> news:vhjj2v$24eu4$3@dont-email.me...
>>> On 20/11/2024 1:29 pm, Bill Sloman wrote:
>>>> On 20/11/2024 12:59 pm, Edward Rawde 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:
> 
> <snip>
> 
>>> I've no idea why you are using the LT1994. The circuit doesn't have a 
>>> common mode problem, so why are you using an op amp designed
>>> to deal with one?
>>>
>>> This is sci.electronics.design not 
>>> sci.electronics.incremental-development.
>>>
>>> And the six diode "stabiliser string" is nuts. If you need a 3.6V 
>>> reference voltage there are lots of ways to do it with more
>>> precision and better temperature stability.
>>
>> In that case please show a circuit with better performance.
>> It may be that some of the circuits JM posted can do better but if so 
>> then why are you using a circuit with so many components?
>> My circuit has far fewer components than yours.
> 
> But you don't seem to be able to tell us what they do.
> 
> I think I've found my conceptual problem with my circuit. Tweaking the 
> gain around the three-amplifier ring tweaks both amplitude and frequency 
> - with more gain a lower frequency signal can still propagate around the 
> ring.
> 
> I've got to find a mechanism that will separate amplitude from 
> frequency. My copy of Williams and Taylor on electronic filter design 
> may get perused again.

I found a simpler solution - copy the relevant arrangement in John May's 
circuit. It did work - after a fashion - but as I got closer to getting 
it to a state where it could do what I wanted, the circuit got less and 
less willing to simulate.

I suspect an accumulation of typo's in component values - I do try to go 
the through the schematic to find and purge them. But the last few 
passes haven't shown up anything. Frustrating. My father's advice in 
similar situautions was to "drop it in drawer for six months, then take 
another look". It has worked in the past.

--
Bill Sloman, Sydney