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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Final final 1kHz oscillator
Date: Tue, 26 Nov 2024 21:52:13 -0500
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"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vi3j1k$3aiv6$1@dont-email.me...
> On 25/11/2024 1:02 pm, Bill Sloman wrote:
>> On 24/11/2024 5:10 pm, Edward Rawde wrote:
>>> "Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vhue9h$243sl$1@dont-email.me...
>>>> On 24/11/2024 5:11 am, Edward Rawde wrote:
>>>>> "Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vhs1ea$1kbt4$1@dont-email.me...
>>>>>> On 23/11/2024 4:12 pm, Edward Rawde wrote:
>>>>>>> "Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vhrma8$1io30$2@dont-email.me...
>>>>>>>> On 23/11/2024 3:32 am, Edward Rawde wrote:
>>>>>>>>> "Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vhp713$12bnt$2@dont-email.me...
>>>>>>>>>> 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>
>
> The current version has been running overnight and has got to three seconds, and the DFT from 2.8 to three seconds shows third 
> harmonic about 90db below the fundamental. The noise floor is about 100dB down and the other harmonics are barely visible above 
> it.
>
> Here's the .asc file. There are extra components put in to make it simulate faster - L1 and L14 are the obvious examples, but L10, 
> L11 and L12 got put in for the same reason. I suspect that if I had put in equivalent series resistance and inductance for C22 as 
> well as for C6 and C15 I might not have needed some of them.
>
> There is some other tidying up I could do, and that should get get the simulation speed up. I got a new circuit from John May last 
> night, and it not only spits out a very clean sine wave but also simulated very fast. I forgot to put it on solid state disk 
> before I ran it, and it took as long to get one of the waveforms off the spinning hard disk as it had done to run the simulation.
>
> Ny tidying up is going to wait until I've got ten seconds worth of simulation out of the current circuit, and can look at the 
> details of what's going on deep in the circuit
>

After running the simulation to 10 seconds I get 80dB down at 3kHz with an FFT on a sample of the last second and a Blackman-Harris 
window.
Looks like the noise level either side of 1kHz may be higher than that.