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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Final final 1kHz oscillator
Date: Mon, 18 Nov 2024 15:06:01 -0500
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"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vhadl5$2v27$1@dont-email.me...
> On 15/11/2024 7:56 pm, Bill Sloman wrote:
>> On 15/11/2024 3:14 am, Edward Rawde 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 finally got around to digging out my AD734 based Wein bridge simulation, and created a FET based version.
>>
>> It's got a nasty 163kHz generator embedded in it somewhere, and I've put in an RL filter to keep that under control.
>
> It looks as if the 163kHz was coming from the LTC6655-1.25V precision reference.
>
> Putting in 4.7uF at C10 - rather than the 1.0uF I started off with - seems to make the simulation run a lot faster - about 20 
> times faster - and cleaned out the visible hash coming from the voltage reference.
>
> The data sheet says use something between 2.7uF and 100uF and recommends film parts - ESR less than 0.1R.  They don't like ceramic 
> parts.
>
> Pulling out the LCR filter (L5,L6, C19, C20, R22 and R23) may have speeded up the simulation too.
>
> The 2kHz and 3kHz harmonics aren't as good as they were - only about 65db below the fundamental - so Ill have to do some more 
> digging.

I changed C10 to 4.7uF and ran the simulation to 10 seconds.
L5 etc are still present.
FFT from 2s to 10s says 60dB down at 3kHz

>
> -- 
> Bill Sloman, Sydney
>