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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: ...!eternal-september.org!feeder2.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Cursitor Doom Newsgroups: sci.electronics.design Subject: Re: Final final 1kHz oscillator Date: Sun, 10 Nov 2024 18:00:01 +0000 Organization: A noiseless patient Spider Lines: 484 Message-ID: References: <86s1jj92mnr5vnausdgfll220vtlj6doq0@4ax.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Injection-Date: Sun, 10 Nov 2024 19:00:03 +0100 (CET) Injection-Info: dont-email.me; posting-host="e5753ce27e12e2d3238ec70b548834c5"; logging-data="524743"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1918Zh3aawaVVGevSPV3ty4CuVEI00pW/s=" User-Agent: ForteAgent/8.00.32.1272 Cancel-Lock: sha1:3APb7Jaw4vIWsfNwuS3u01ODNJc= Bytes: 16019 On Sun, 10 Nov 2024 17:45:00 +0000, Cursitor Doom wrote: >On Sun, 10 Nov 2024 12:12:34 -0500, "Edward Rawde" > wrote: > >>"Cursitor Doom" wrote in message news:bs81jjt7d064jc1ktmvihgn30qkhf67taj@4ax.com... >>> On Sun, 10 Nov 2024 00:49:36 -0500, "Edward Rawde" >>> wrote: >>> >>>>"Bill Sloman" wrote in message news:vgnkgg$3p31a$1@dont-email.me... >>>>> On 9/11/2024 7:39 pm, Edward Rawde wrote: >>>>>> "Bill Sloman" 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. > >Indeed, but for a simulation we should be seeing identical results! >I've made the change as you suggested and it's increased the sim time >considerably. I'll post again when it's completed. Update: looking *much* better at 25% done. Settled after 7.5s. I will let it run its course anyway and post again at the end with the final outcome. > > >> >>> 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 >>>>WIRE 640 -512 640 -528 >>>>WIRE -32 -464 -32 -480 >>>>WIRE 48 -448 48 -576 >>>>WIRE 48 -448 0 -448 >>>>WIRE -96 -432 -96 -576 >>>>WIRE -64 -432 -96 -432 >>>>WIRE 112 -416 112 -528 >>>>WIRE 112 -416 0 -416 >>>>WIRE 160 -416 112 -416 >>>>WIRE 208 -416 160 -416 >>>>WIRE 336 -416 288 -416 >>>>WIRE 400 -416 336 -416 >>>>WIRE 512 -416 400 -416 >>>>WIRE 624 -416 512 -416 >>>>WIRE -96 -384 -96 -432 >>>>WIRE -32 -384 -32 -400 >>>>WIRE 48 -368 48 -448 >>>>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 >>>>WIRE 48 -240 48 -288 >>>>WIRE 160 -240 160 -288 >>>>WIRE 336 -240 336 -288 >>>>WIRE 400 -240 400 -288 >>>>WIRE -192 -176 -192 -272 >>>>WIRE -224 -128 -256 -128 >>>>WIRE -96 -128 -96 -160 >>>>WIRE -96 -128 -128 -128 >>>>WIRE -80 -128 -96 -128 >>>>WIRE 144 -128 -80 -128 >>>>WIRE 288 -128 224 -128 >>>>WIRE 352 -128 288 -128 >>>>WIRE 512 -128 512 -224 >>>>WIRE 512 -128 432 -128 >>>>WIRE -256 -48 -256 -128 >>>>WIRE -208 -48 -256 -48 >>>>WIRE -80 -48 -80 -128 >>>>WIRE -80 -48 -128 -48 >>>>WIRE 288 -16 288 -128 >>>>WIRE 288 -16 64 -16 >>>>WIRE 352 -16 288 -16 >>>>WIRE 512 -16 512 -128 >>>>WIRE 512 -16 432 -16 >>>>WIRE -256 0 -256 -48 >>>>WIRE 144 48 144 32 >>>>WIRE -240 96 -320 96 >>>>WIRE -176 96 -240 96 >>>>WIRE 64 96 64 -16 >>>>WIRE 112 96 64 96 >>>>WIRE 512 96 512 -16 >>>>WIRE 512 96 272 96 >>>>WIRE -32 128 -96 128 >>>>WIRE 112 128 -32 128 >>>>WIRE -320 144 -320 96 >>>>WIRE 624 144 624 -224 >>>>WIRE 656 144 624 144 >>>>WIRE 752 144 720 144 >>>>WIRE -176 160 -176 96 >>>>WIRE -32 160 -32 128 >>>>WIRE 112 160 64 160 >>>>WIRE 624 160 624 144 >>>>WIRE 624 160 272 160 >>>>WIRE 752 176 752 144 >>>>WIRE 144 224 144 208 >>>>WIRE -32 256 -32 224 >>>>WIRE 64 272 64 160 >>>>WIRE 160 272 64 272 >>>>WIRE 288 272 160 272 >>>>WIRE 400 272 352 272 >>>>WIRE 512 272 512 96 >>>>WIRE 512 272 480 272 >>>>WIRE 64 288 64 272 >>>>WIRE 160 288 160 272 >>>>WIRE 752 288 752 256 >>>>WIRE 880 288 752 288 >>>>WIRE 928 288 880 288 >>>>WIRE -320 320 -320 224 >>>>WIRE -320 320 -400 320 >>>>WIRE 928 320 928 288 >>>>WIRE -400 336 -400 320 >>>>WIRE -320 336 -320 320 >>>>WIRE -176 336 -176 224 >>>>WIRE -176 336 -320 336 >>>>WIRE -96 336 -96 128 >>>>WIRE 64 384 64 368 >>>>WIRE 160 384 160 352 >>>>WIRE 160 384 64 384 >>>>WIRE -320 416 -320 336 >>>>WIRE 64 416 64 384 >>>>WIRE -176 432 -176 336 >>>>WIRE 192 432 144 432 >>>>WIRE 304 432 272 432 >>>>WIRE 384 432 368 432 >>>>WIRE 928 432 928 400 >>>>WIRE 512 448 512 272 >>>>WIRE 624 448 624 160 >>>>WIRE 288 544 288 528 >>>>WIRE 384 560 384 432 >>>>WIRE 384 560 320 560 >>>>WIRE 624 560 624 512 >>>>WIRE 624 560 384 560 >>>>WIRE -96 576 -96 416 >>>>WIRE -48 576 -96 576 >>>>WIRE 32 576 -48 576 >>>>WIRE 144 576 144 432 >>>>WIRE 144 576 112 576 >>>>WIRE 208 576 144 576 >>>>WIRE 256 576 208 576 >>>>WIRE -320 592 -320 496 ========== REMAINDER OF ARTICLE TRUNCATED ==========