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From: Cursitor Doom <cd@notformail.com>
Newsgroups: sci.electronics.design
Subject: Re: Final final 1kHz oscillator
Date: Sun, 10 Nov 2024 12:17:34 +0000
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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, 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
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