Path: ...!news.misty.com!weretis.net!feeder9.news.weretis.net!usenet.blueworldhosting.com!diablo1.usenet.blueworldhosting.com!nnrp.usenet.blueworldhosting.com!.POSTED!not-for-mail
From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: The not-all-that-low distortion sine wave oscillator in a faster simulating version
Date: Wed, 18 Dec 2024 14:00:55 -0500
Organization: BWH Usenet Archive (https://usenet.blueworldhosting.com)
Lines: 351
Message-ID: <vjv658$16ls$1@nnrp.usenet.blueworldhosting.com>
References: <vjtgnp$24ubg$1@dont-email.me>
Injection-Date: Wed, 18 Dec 2024 19:00:56 -0000 (UTC)
Injection-Info: nnrp.usenet.blueworldhosting.com;
	logging-data="39612"; mail-complaints-to="usenet@blueworldhosting.com"
Cancel-Lock: sha1:zbMN/lDlH4hOZjlD0ykgYerwv2Y= sha256:3J9L43IbfL6XuohvQlfwcGopuEjOQ7mbRB3WrGo7aBE=
	sha1:XSvQIP77lN6+D8pfmhb53j/ov6g= sha256:BncwIgvrjF8bS6Rpvb1EzVNg0emeU3v0CYZEnmoTAMM=
X-Newsreader: Microsoft Outlook Express 6.00.2900.5931
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157
X-MSMail-Priority: Normal
X-Priority: 3
X-RFC2646: Format=Flowed; Response
Bytes: 10543

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vjtgnp$24ubg$1@dont-email.me...
> I've been playing with the circuit, and have got rid of one op amp, which made the simulation run much faster, but didn't help the 
> distortion performance.
>
> Swapping the LT1115 for the LME49710 speeded up the simulation a bit more, but didn't make any difference to the distortion 
> either. A few of the ferrite beads have gone too.
>

I got a simulation speed of about 30us/s so I didn't wait the nearly 4 days it would take to complete.
I did an FFT on the first few cycles and it does look 100dB down up to 1.5MHz.

But what's the point when the circuit below is comfortably 120dB down in simulation using less than half the number of components?

It requires only a single rail and if 60dB will meet your needs then a single 9V battery is fine.

All the components are doing what I want them to do and I know what they all do.

To attempt do any better in simulation I'd replace D1 with a precision rectifier at 0 and 180 degrees and maybe 90 and 270 too.

If building this for real then ten turn trimmers would be used for:
R14 2.2k
R3 68 ohm
R16 100k
And I'd also want R19 or part of it variable.

I wish LTSpice had a "Do you want to fix apparent line wraps Y/N". That shouldn't be hard.

Also is there any way in LTSpice to find a component?
What I mean is let's say you have a schematic like Bill's schematic and you know that R17 is there somewhere but you don't know 
where.

Version 4
SHEET 1 2196 932
WIRE 864 -784 704 -784
WIRE 944 -784 944 -816
WIRE 768 -720 768 -736
WIRE 864 -704 864 -784
WIRE 864 -704 800 -704
WIRE 704 -688 704 -784
WIRE 704 -688 592 -688
WIRE 736 -688 704 -688
WIRE 944 -672 944 -704
WIRE 944 -672 800 -672
WIRE 336 -640 256 -640
WIRE 480 -640 400 -640
WIRE 768 -640 768 -656
WIRE 944 -640 944 -672
WIRE 1056 -640 944 -640
WIRE 944 -624 944 -640
WIRE 1056 -608 1056 -640
WIRE 592 -576 592 -688
WIRE 256 -544 256 -640
WIRE 336 -544 256 -544
WIRE 480 -544 480 -640
WIRE 480 -544 416 -544
WIRE 944 -512 944 -544
WIRE 1056 -512 1056 -544
WIRE -192 -480 -192 -512
WIRE 384 -432 384 -448
WIRE 480 -416 480 -544
WIRE 480 -416 416 -416
WIRE 592 -416 592 -496
WIRE 592 -416 480 -416
WIRE 848 -416 592 -416
WIRE 992 -416 928 -416
WIRE 1136 -416 1056 -416
WIRE 256 -400 256 -544
WIRE 352 -400 256 -400
WIRE 448 -384 416 -384
WIRE 464 -384 448 -384
WIRE 16 -352 -144 -352
WIRE 384 -352 384 -368
WIRE 256 -336 256 -400
WIRE 944 -288 848 -288
WIRE 1136 -288 1136 -416
WIRE 1136 -288 1008 -288
WIRE -80 -272 -80 -304
WIRE -144 -256 -144 -352
WIRE -112 -256 -144 -256
WIRE 16 -240 16 -352
WIRE 16 -240 -48 -240
WIRE 64 -240 16 -240
WIRE 96 -240 64 -240
WIRE -192 -224 -192 -400
WIRE -112 -224 -192 -224
WIRE -416 -208 -416 -304
WIRE 480 -192 416 -192
WIRE 608 -192 544 -192
WIRE 848 -192 848 -288
WIRE 944 -192 848 -192
WIRE 1136 -192 1136 -288
WIRE 1136 -192 1024 -192
WIRE -192 -176 -192 -224
WIRE -192 -176 -256 -176
WIRE -80 -176 -80 -208
WIRE 208 -176 160 -176
WIRE 256 -176 256 -256
WIRE 256 -176 208 -176
WIRE -192 -144 -192 -176
WIRE -256 -128 -256 -176
WIRE 160 -128 160 -176
WIRE 416 -96 416 -192
WIRE 480 -96 416 -96
WIRE 608 -96 608 -192
WIRE 608 -96 560 -96
WIRE 848 -96 848 -192
WIRE 896 -96 848 -96
WIRE 1008 -96 976 -96
WIRE 1136 -96 1136 -192
WIRE 1136 -96 1088 -96
WIRE -416 -32 -416 -128
WIRE -256 -32 -256 -64
WIRE -192 -32 -192 -64
WIRE 256 -32 256 -176
WIRE 496 0 496 -16
WIRE 128 16 112 16
WIRE 160 16 160 -48
WIRE 160 16 128 16
WIRE 192 16 160 16
WIRE 304 16 288 16
WIRE 336 16 304 16
WIRE 416 16 416 -96
WIRE 416 16 336 16
WIRE 464 16 416 16
WIRE 928 16 928 0
WIRE 1136 16 1136 -96
WIRE 1168 16 1136 16
WIRE 1296 16 1248 16
WIRE 1456 16 1360 16
WIRE 1520 16 1456 16
WIRE 608 32 608 -96
WIRE 608 32 528 32
WIRE 640 32 608 32
WIRE 720 32 704 32
WIRE 848 32 848 -96
WIRE 848 32 800 32
WIRE 896 32 848 32
WIRE 432 48 416 48
WIRE 464 48 432 48
WIRE 1136 48 1136 16
WIRE 1136 48 960 48
WIRE 864 64 848 64
WIRE 896 64 864 64
WIRE 496 80 496 64
WIRE 1520 80 1520 16
WIRE 112 96 112 16
WIRE 192 96 112 96
WIRE 336 96 336 16
WIRE 336 96 272 96
WIRE 928 96 928 80
WIRE 1520 176 1520 160
WIRE 112 224 112 96
WIRE 480 224 112 224
WIRE 640 224 560 224
WIRE 1136 224 1136 48
WIRE 1136 224 720 224
FLAG 384 -448 V+
FLAG 496 -16 V+
FLAG 928 0 V+
FLAG 208 -176 gate
FLAG 128 16 drn
FLAG 1520 176 0
FLAG 1456 16 output
FLAG -416 -32 0
FLAG 384 -352 0
FLAG 496 80 0
FLAG 928 96 0
FLAG -416 -304 V+
FLAG 448 -384 half
FLAG 432 48 half
FLAG 864 64 half
FLAG -80 -176 0
FLAG -80 -304 V+
FLAG 64 -240 half
FLAG -192 -32 0
FLAG -192 -512 V+
FLAG -256 -32 0
FLAG 304 16 src
FLAG 768 -736 V+
========== REMAINDER OF ARTICLE TRUNCATED ==========