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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Final final 1kHz oscillator
Date: Sun, 10 Nov 2024 12:12:34 -0500
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"Cursitor Doom" <cd@notformail.com> wrote in message news:bs81jjt7d064jc1ktmvihgn30qkhf67taj@4ax.com...
> On Sun, 10 Nov 2024 00:49:36 -0500, "Edward Rawde"
> <invalid@invalid.invalid> wrote:
>
>>"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vgnkgg$3p31a$1@dont-email.me...
>>> On 9/11/2024 7:39 pm, Edward Rawde wrote:
>>>> "Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vgn4gm$3lcor$1@dont-email.me...
>>>>> On 9/11/2024 7:43 am, Edward Rawde wrote:
>>>>>> This is the simplest circuit I can come up with.
>>>>>> Harmonics are more than 80dB down in simulation.
>>>>>> FFT the last 30 seconds.
>>>>>> There is only one harmonic stopping me claiming 90dB but the exact FFT result can depend
>>>>>> on exactly how much output is selected for the FFT. You may see different results.
>>>>>>
>>
>>I have fixed my circuit but it raises more questions than it answers.
>>This circuit deliberately has no text and no u symbols so should be ready to simulate.
>>If you let it complete (about 20 minutes on a fast PC) the FFT should show at least 80dB purity and there aren't many harmonics
>>standing in the way of 90dB.
>>Startup isn't fast and it takes at least 20 seconds of simulation to fully settle.
>
> Spectral purity might be fine for all I can tell but the output
> amplitude is all over the place,

Change R9 to 1.07Meg does it amplitude stabilize now?
Adjustment will be needed in any real circuit.

> even if the sim is left to run its
> full course. Also, what's the purpose of the 6 diodes in series at the
> top of the schematic? If you need to drop 4V there ought to be a more
> elegant way of doing it!
>
>
>
>>There are two things I don't understand about my own circuit.
>>
>>1. Why does LT1678 work fine in position U2 but LT1057 does not.
>>2. Why is the DC stabilization circuit (U3 and associated components) needed and would it work just the same in reality?
>>
>>Version 4
>>SHEET 1 2196 932
>>WIRE -64 -576 -96 -576
>>WIRE 48 -576 16 -576
>>WIRE 128 -528 112 -528
>>WIRE 208 -528 192 -528
>>WIRE 288 -528 272 -528
>>WIRE 368 -528 352 -528
>>WIRE 448 -528 432 -528
>>WIRE 528 -528 512 -528
>>WIRE 640 -528 592 -528
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>>WIRE 48 -448 48 -576
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>>WIRE 512 -416 400 -416
>>WIRE 624 -416 512 -416
>>WIRE -96 -384 -96 -432
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>>WIRE 336 -368 336 -416
>>WIRE 160 -352 160 -416
>>WIRE 400 -352 400 -416
>>WIRE 512 -288 512 -416
>>WIRE 624 -288 624 -416
>>WIRE -96 -272 -96 -304
>>WIRE -96 -272 -192 -272
>>WIRE -96 -240 -96 -272
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>>WIRE 336 -240 336 -288
>>WIRE 400 -240 400 -288
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>>WIRE -80 -128 -96 -128
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>>WIRE -80 -48 -128 -48
>>WIRE 288 -16 288 -128
>>WIRE 288 -16 64 -16
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>>WIRE 624 160 272 160
>>WIRE 752 176 752 144
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>>WIRE 624 560 384 560
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>>WIRE -48 576 -96 576
>>WIRE 32 576 -48 576
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>>WIRE -320 592 -320 496
>>WIRE -240 592 -320 592
>>WIRE -176 592 -176 496
>>WIRE -176 592 -240 592
>>WIRE 432 592 320 592
>>WIRE 512 592 512 512
>>WIRE 512 592 432 592
>>WIRE 624 592 624 560
>>WIRE 704 592 624 592
>>WIRE -96 624 -96 576
>>WIRE -48 624 -48 576
>>WIRE 288 624 288 608
>>WIRE 512 624 512 592
>>WIRE 704 624 704 592
>>WIRE 432 640 432 592
>>WIRE 624 640 624 592
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