The not-all-that-low distortion sine wave oscillator in a faster simulating version

It seems to like to squeg for me (LTSpice 17.0.37)

I've seen that happen, but only when the one of the connections has come unstuck. The route through WordPad to here and on to your own .asc file can screw up the schematic.

The amplitude control feedback loop - through the four-pole maximally flat low pass filter around U6 and U7 through the integrator around U5 does include the 68k resistor at R10 to provide enough phase lead to keep it stable.

I plot V(out) and the control voltage V(fet-gate), and V(fet-gate) starts off at 0V and drops below -3.862V within 5msec after which V(out) starts building up. The amplitude control system system kicks in at

Post the .asc file you ran.

When I was looking at the circuit I realised that I'd left out R31, and got R7 slightly wrong at the FET gate. It doesn't make an obvious difference, but here's the corrected .asc file.

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SYMATTR InstName C1 SYMATTR Value 3.3n SYMBOL schottky 352 -1344 R0 WINDOW 3 -89 62 Left 2 WINDOW 0 -92 37 Left 2 SYMATTR Value BAS70L SYMATTR InstName D1 SYMBOL schottky 352 -944 R0 WINDOW 3 -78 61 Left 2 WINDOW 0 -81 40 Left 2 SYMATTR Value BAS70L SYMATTR InstName D2 SYMBOL res 352 -1472 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1a SYMATTR Value 10k SYMATTR SpiceLine tol=0.1 SYMBOL res 208 -1536 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 20k SYMATTR SpiceLine tol=1 SYMBOL res 480 -1408 R0 WINDOW 0 41 41 Left 2 WINDOW 3 34 79 Left 2 SYMATTR InstName R2a SYMATTR Value 10k SYMATTR SpiceLine tol=0.1 SYMBOL res 560 -928 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2b SYMATTR Value 10k SYMATTR SpiceLine tol=0.1 SYMBOL res 720 -928 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2c SYMATTR Value 10k SYMATTR SpiceLine tol=0.1 SYMBOL cap 704 -832 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 4.7n SYMATTR SpiceLine Rser=10 Lser=6n SYMBOL cap 192 -1056 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C4 SYMATTR Value 3.3p SYMBOL res 48 -896 R0 WINDOW 0 39 33 Left 2 WINDOW 3 40 74 Left 2 SYMATTR InstName R1b SYMATTR Value 10k SYMATTR SpiceLine tol=0.1 SYMBOL voltage -1104 -1120 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 12 SYMBOL voltage -1104 -976 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value 12 SYMBOL cap -480 -1552 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C5 SYMATTR Value 15n SYMATTR SpiceLine V=63 Rser=4 Lser=12n SYMBOL res -448 -1520 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R4 SYMATTR Value 10.7k SYMATTR SpiceLine tol=1 SYMBOL cap -64 -1728 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C6 SYMATTR Value 15n SYMATTR SpiceLine V=63 Rser=4 Lser=12n SYMBOL cap 3104 -1664 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C8 SYMATTR Value 100n SYMBOL res 2848 -1760 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R10 SYMATTR Value 68k SYMBOL Opamps\\LT1056A 2992 -1456 R0 SYMATTR InstName U5 SYMBOL cap 2784 -1120 R0 SYMATTR InstName C10 SYMATTR Value 3.3µ SYMBOL cap 2912 -1552 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C11 SYMATTR Value 3.3p SYMBOL res -1600 -1360 R180 WINDOW 0 31 76 Left 2 WINDOW 3 31 40 Left 2 SYMATTR InstName R11 SYMATTR Value 10k SYMATTR SpiceLine tol=0.1 SYMBOL Opamps\\OP27 576 -1264 R0 SYMATTR InstName U2 SYMBOL FerriteBead 576 -672 R0 SYMATTR InstName L2 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL cap 752 -1408 R0 SYMATTR InstName C15 SYMATTR Value 100n SYMBOL cap 752 -800 R0 SYMATTR InstName C16 SYMATTR Value 100n SYMBOL FerriteBead -176 -928 R0 SYMATTR InstName L4 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL cap -336 -2000 R0 WINDOW 0 -60 15 Left 2 WINDOW 3 -62 54 Left 2 SYMATTR InstName C17 SYMATTR Value 100n SYMBOL cap -336 -1168 R0 WINDOW 0 -60 15 Left 2 WINDOW 3 -62 54 Left 2 SYMATTR InstName C18 SYMATTR Value 100n SYMBOL res -1632 -1664 R0 WINDOW 0 43 37 Left 2 WINDOW 3 47 73 Left 2 SYMATTR InstName R21 SYMATTR Value 10k SYMATTR SpiceLine tol=0.1 SYMBOL cap 2272 -1184 R0 SYMATTR InstName C21 SYMATTR Value 100n SYMBOL FerriteBead 2288 -1408 R0 SYMATTR InstName L7 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL res -512 -1888 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R22 SYMATTR Value 2.49k SYMATTR SpiceLine tol=1 SYMBOL FerriteBead -320 -2112 R0 SYMATTR InstName L8 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL cap -752 -1984 R0 WINDOW 0 -60 15 Left 2 WINDOW 3 -62 54 Left 2 SYMATTR InstName C7 SYMATTR Value 100n SYMBOL FerriteBead -736 -2128 R0 SYMATTR InstName L3 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL FerriteBead -656 -896 R0 SYMATTR InstName L9 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL cap -864 -1152 R0 WINDOW 0 -60 15 Left 2 WINDOW 3 -62 54 Left 2 SYMATTR InstName C23 SYMATTR Value 100n SYMBOL res -160 -1600 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R26 SYMATTR Value 10.7k SYMATTR SpiceLine tol=1 SYMBOL res -768 -1808 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 4.87k SYMATTR SpiceLine tol=1 SYMBOL cap -784 -1584 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C19 SYMATTR Value 10p SYMBOL FerriteBead 208 -672 R0 SYMATTR InstName L5 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL FerriteBead 208 -2128 R0 SYMATTR InstName L6 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL cap 320 -1968 R0 WINDOW 0 -60 15 Left 2 WINDOW 3 -62 54 Left 2 SYMATTR InstName C20 SYMATTR Value 100n SYMBOL cap -96 -816 R0 WINDOW 0 -60 15 Left 2 WINDOW 3 -62 54 Left 2 SYMATTR InstName C22 SYMATTR Value 100n SYMBOL njf -1312 -1584 R0 SYMATTR InstName J1 SYMATTR Value MMBF4391 SYMBOL References\\LTC6655-1.25 2560 -1120 R0 SYMATTR InstName U4 SYMBOL cap -64 -1824 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C9 SYMATTR Value 10p SYMBOL FerriteBead 576 -1936 R0 SYMATTR InstName L13 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL res -944 -1808 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 82 SYMATTR SpiceLine tol=1 SYMBOL cap 704 -1088 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C13 SYMATTR Value 10p SYMBOL res 2592 -1792 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R12 SYMATTR Value 137k SYMBOL res 1376 -1776 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R8 SYMATTR Value 14k SYMBOL res 1216 -1456 R0 SYMATTR InstName R13 SYMATTR Value 56k SYMBOL cap 1312 -1392 R0 SYMATTR InstName C3 SYMATTR Value 18n SYMBOL cap 1056 -1856 R0 SYMATTR InstName C12 SYMATTR Value 18n SYMBOL res 1216 -1568 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R14 SYMATTR Value 14k SYMBOL Opamps\\LT1013 1392 -1632 R0 SYMATTR InstName U6 SYMBOL res 896 -1536 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R15 SYMATTR Value 18.7k SYMBOL res 2048 -1840 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R16 SYMATTR Value 14k SYMBOL cap 1728 -1872 R0 SYMATTR InstName C14 SYMATTR Value 18n SYMBOL res 1888 -1584 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R17 SYMATTR Value 14k SYMBOL Opamps\\LT1013 2064 -1648 R0 SYMATTR InstName U7 SYMBOL res 1568 -1552 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R18 SYMATTR Value 18.7k SYMBOL res 1888 -1408 R0 SYMATTR InstName R19 SYMATTR Value 56k SYMBOL cap 1984 -1344 R0 SYMATTR InstName C24 SYMATTR Value 18n SYMBOL npn -1584 -1120 R0 SYMATTR InstName Q1 SYMATTR Value BC847A SYMBOL npn -1712 -1120 M0 SYMATTR InstName Q2 SYMATTR Value BC847A SYMBOL res -1536 -960 R0 WINDOW 0 41 37 Left 2 WINDOW 3 36 71 Left 2 SYMATTR InstName R20 SYMATTR Value 1.2k SYMATTR SpiceLine tol=0.1 SYMBOL res -1792 -960 R0 WINDOW 0 41 37 Left 2 WINDOW 3 36 71 Left 2 SYMATTR InstName R23 SYMATTR Value 1.2k SYMATTR SpiceLine tol=0.1 SYMBOL FerriteBead -1776 -976 R0 SYMATTR InstName L12 SYMATTR Value 14µ SYMATTR SpiceLine Ipk=3 Rser=0.0122 Rpar=870 Cpar=1000f mfg="Würth Elektronik" pn="7427503 WE-UKW 40060" SYMBOL FerriteBead -1520 -976 R0 SYMATTR InstName L14 SYMATTR Value 14µ SYMATTR SpiceLine Ipk=3 Rser=0.0122 Rpar=870 Cpar=1000f SYMBOL res -2000 -1840 R0 WINDOW 0 43 37 Left 2 WINDOW 3 47 73 Left 2 SYMATTR InstName R24 SYMATTR Value 20k SYMATTR SpiceLine tol=0.1 SYMBOL res -2000 -960 R0 WINDOW 0 43 37 Left 2 WINDOW 3 47 73 Left 2 SYMATTR InstName R25 SYMATTR Value 10k SYMATTR SpiceLine tol=0.1 SYMBOL pnp -1840 -1472 M180 SYMATTR InstName Q3 SYMBOL cap -1840 -1376 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C25 SYMATTR Value 100n SYMBOL res -1792 -1840 R0 WINDOW 0 43 37 Left 2 WINDOW 3 47 73 Left 2 SYMATTR InstName R27 SYMATTR Value 6.65k SYMATTR SpiceLine tol=0.1 SYMBOL res 2384 -1792 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R9 SYMATTR Value 17k SYMBOL res 2416 -1728 R0 SYMATTR InstName R28 SYMATTR Value 68k SYMBOL res -1408 -1776 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R7 SYMATTR Value 215 SYMATTR SpiceLine tol=1 SYMBOL res -1456 -1712 R0 WINDOW 0 43 37 Left 2 WINDOW 3 47 73 Left 2 SYMATTR InstName R29 SYMATTR Value 220 SYMATTR SpiceLine tol=0.1 SYMBOL res -1504 -1968 R0 WINDOW 0 43 37 Left 2 WINDOW 3 47 73 Left 2 SYMATTR InstName R30 SYMATTR Value 13.3k SYMATTR SpiceLine tol=0.1 SYMBOL Opamps\\LT1115 -656 -1504 R0 SYMATTR InstName U3 SYMBOL Opamps\\LT1115 -176 -1584 R0 SYMATTR InstName U8 SYMBOL res -1632 -1968 R0 WINDOW 0 43 37 Left 2 WINDOW 3 47 73 Left 2 SYMATTR InstName R31 SYMATTR Value 47k SYMATTR SpiceLine tol=0.1 TEXT -1424 -776 Left 2 !.MODEL BAS70L D \n+ IS = 3.22E-9 \n+ N = 1.018 \n+ BV = 77 \n+ IBV = 1.67E-7 \n+ RS = 20.89 \n+ CJO = 1.608E-12 \n+ VJ = 0.3891 \n+ M = 0.3683 \n+ FC = 0.5 \n+ EG = 0.69 \n+ XTI = 2 \n.ENDS TEXT -336 -528 Left 2 ;R2 a,b,c, Vishay Beschlag ACAS06S0830372P1AT precision 10k resistor array \n R1a, R1b Maxim MAX5492LB10000+T 10K resistive divider in a SOT-23-5 package TEXT -720 -464 Left 2 !.MODEL MMBF4391 NJF VTO=-4.6 BETA=0.02779 LAMBDA=0.00595 RD=1 RS=1 IS=1e-14 CGD=14p CGS=10.5p PB=1 B=1 KF=1e-18 AF=1 FC=0.5 mfg=Motorola TEXT -1112 -464 Left 2 !.tran 0 10s 0s startup

"Bill Sloman" snipped-for-privacy@ieee.org wrote in message news:vjtgnp$24ubg$ snipped-for-privacy@dont-email.me...

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.

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TEXT -296 -616 Left 2 ;18 Dec 2024.

It rans at 68msec/sec for me and takes a couple of minutes to run the full ten seconds.

Or think you do. You explanations haven't been all that clear.

Why a ten turn trimmer?

Beckman ten-turn precision potentionmeters were designed to be used with turns-counting dials. 19mm trimmers ran around twenty turns, but weren't all that precisely settable.

First define a line wrap in terms that you can program. It's a carriage return and a line feed, but so is a real new line.

Inspection works fine for me. Professional circuit diagrams tend to get re-numbered before they are released to production so the numbers run from left to right across the sheet in bands, then from top to bottom as you moved down from the top band to the bottom band.

It's on the non-inverting input of U7.

"Bill Sloman" snipped-for-privacy@ieee.org wrote in message news:vk00um$2i900$ snipped-for-privacy@dont-email.me...

I used the circuit from your third post. One op amp had to be moved down a bit into position and then I hit simulate. To be sure we're talking about the same circuit I've reposted it below. I'm using LTSpice 24.0.12 with no new model updates available as of this post.

Well it's true that most, perhaps all, of the designs I've ever done used components I didn't design myself. Even discrete circuits. So I have to rely on either what the data sheet says or what tests with a real circuit say. In this case I don't have a real circuit so I have to rely on LTSpice.

Can be 100 turn if you want. The point is only that fine adjustment would be a good idea.

There are reasons why Notepad++ has an EOL conversion option Bill but never mind.

What would you do when a change is required which requires an additional component such as an additional resistor or capacitor?

And it was just an example.

Repost of simulated circuit:

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SYMATTR InstName C1 SYMATTR Value 3.3n SYMBOL schottky 352 -1344 R0 WINDOW 3 -89 62 Left 2 WINDOW 0 -92 37 Left 2 SYMATTR Value BAS70L SYMATTR InstName D1 SYMBOL schottky 352 -944 R0 WINDOW 3 -78 61 Left 2 WINDOW 0 -81 40 Left 2 SYMATTR Value BAS70L SYMATTR InstName D2 SYMBOL res 352 -1472 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1a SYMATTR Value 10k SYMATTR SpiceLine tol=0.1 SYMBOL res 208 -1536 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 20k SYMATTR SpiceLine tol=1 SYMBOL res 480 -1408 R0 WINDOW 0 41 41 Left 2 WINDOW 3 34 79 Left 2 SYMATTR InstName R2a SYMATTR Value 10k SYMATTR SpiceLine tol=0.1 SYMBOL res 560 -928 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2b SYMATTR Value 10k SYMATTR SpiceLine tol=0.1 SYMBOL res 720 -928 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2c SYMATTR Value 10k SYMATTR SpiceLine tol=0.1 SYMBOL cap 704 -832 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 4.7n SYMATTR SpiceLine Rser=10 Lser=6n SYMBOL cap 192 -1056 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C4 SYMATTR Value 3.3p SYMBOL res 48 -896 R0 WINDOW 0 39 33 Left 2 WINDOW 3 40 74 Left 2 SYMATTR InstName R1b SYMATTR Value 10k SYMATTR SpiceLine tol=0.1 SYMBOL voltage -1104 -1120 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 12 SYMBOL voltage -1104 -976 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value 12 SYMBOL cap -480 -1552 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C5 SYMATTR Value 15n SYMATTR SpiceLine V=63 Rser=4 Lser=12n SYMBOL res -448 -1520 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R4 SYMATTR Value 10.7k SYMATTR SpiceLine tol=1 SYMBOL cap -64 -1728 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C6 SYMATTR Value 15n SYMATTR SpiceLine V=63 Rser=4 Lser=12n SYMBOL cap 3104 -1664 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C8 SYMATTR Value 100n SYMBOL res 2848 -1760 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R10 SYMATTR Value 68k SYMBOL Opamps\\LT1056A 2992 -1456 R0 SYMATTR InstName U5 SYMBOL cap 2784 -1120 R0 SYMATTR InstName C10 SYMATTR Value 3.3µ SYMBOL cap 2912 -1552 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C11 SYMATTR Value 3.3p SYMBOL res -1600 -1360 R180 WINDOW 0 31 76 Left 2 WINDOW 3 31 40 Left 2 SYMATTR InstName R11 SYMATTR Value 10k SYMATTR SpiceLine tol=0.1 SYMBOL Opamps\\OP27 576 -1264 R0 SYMATTR InstName U2 SYMBOL FerriteBead 576 -672 R0 SYMATTR InstName L2 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL cap 752 -1408 R0 SYMATTR InstName C15 SYMATTR Value 100n SYMBOL cap 752 -800 R0 SYMATTR InstName C16 SYMATTR Value 100n SYMBOL FerriteBead -176 -928 R0 SYMATTR InstName L4 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL cap -336 -2000 R0 WINDOW 0 -60 15 Left 2 WINDOW 3 -62 54 Left 2 SYMATTR InstName C17 SYMATTR Value 100n SYMBOL cap -336 -1168 R0 WINDOW 0 -60 15 Left 2 WINDOW 3 -62 54 Left 2 SYMATTR InstName C18 SYMATTR Value 100n SYMBOL res -1632 -1664 R0 WINDOW 0 43 37 Left 2 WINDOW 3 47 73 Left 2 SYMATTR InstName R21 SYMATTR Value 10k SYMATTR SpiceLine tol=0.1 SYMBOL cap 2272 -1184 R0 SYMATTR InstName C21 SYMATTR Value 100n SYMBOL FerriteBead 2288 -1408 R0 SYMATTR InstName L7 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL res -512 -1888 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R22 SYMATTR Value 2.49k SYMATTR SpiceLine tol=1 SYMBOL FerriteBead -320 -2112 R0 SYMATTR InstName L8 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL cap -752 -1984 R0 WINDOW 0 -60 15 Left 2 WINDOW 3 -62 54 Left 2 SYMATTR InstName C7 SYMATTR Value 100n SYMBOL FerriteBead -736 -2128 R0 SYMATTR InstName L3 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL FerriteBead -656 -896 R0 SYMATTR InstName L9 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL cap -864 -1152 R0 WINDOW 0 -60 15 Left 2 WINDOW 3 -62 54 Left 2 SYMATTR InstName C23 SYMATTR Value 100n SYMBOL res -160 -1600 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R26 SYMATTR Value 10.7k SYMATTR SpiceLine tol=1 SYMBOL res -768 -1808 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 4.87k SYMATTR SpiceLine tol=1 SYMBOL cap -784 -1584 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C19 SYMATTR Value 10p SYMBOL FerriteBead 208 -672 R0 SYMATTR InstName L5 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL FerriteBead 208 -2128 R0 SYMATTR InstName L6 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL cap 320 -1968 R0 WINDOW 0 -60 15 Left 2 WINDOW 3 -62 54 Left 2 SYMATTR InstName C20 SYMATTR Value 100n SYMBOL cap -96 -816 R0 WINDOW 0 -60 15 Left 2 WINDOW 3 -62 54 Left 2 SYMATTR InstName C22 SYMATTR Value 100n SYMBOL njf -1312 -1584 R0 SYMATTR InstName J1 SYMATTR Value MMBF4391 SYMBOL References\\LTC6655-1.25 2560 -1120 R0 SYMATTR InstName U4 SYMBOL cap -64 -1824 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C9 SYMATTR Value 10p SYMBOL FerriteBead 576 -1936 R0 SYMATTR InstName L13 SYMATTR Value 1000n SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth Elektronik" pn="782422601 WE-CBA 0402" SYMBOL res -944 -1808 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 82 SYMATTR SpiceLine tol=1 SYMBOL cap 704 -1088 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C13 SYMATTR Value 10p SYMBOL res 2592 -1792 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R12 SYMATTR Value 137k SYMBOL res 1376 -1776 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R8 SYMATTR Value 14k SYMBOL res 1216 -1456 R0 SYMATTR InstName R13 SYMATTR Value 56k SYMBOL cap 1312 -1392 R0 SYMATTR InstName C3 SYMATTR Value 18n SYMBOL cap 1056 -1856 R0 SYMATTR InstName C12 SYMATTR Value 18n SYMBOL res 1216 -1568 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R14 SYMATTR Value 14k SYMBOL Opamps\\LT1013 1392 -1632 R0 SYMATTR InstName U6 SYMBOL res 896 -1536 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R15 SYMATTR Value 18.7k SYMBOL res 2048 -1840 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R16 SYMATTR Value 14k SYMBOL cap 1728 -1872 R0 SYMATTR InstName C14 SYMATTR Value 18n SYMBOL res 1888 -1584 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R17 SYMATTR Value 14k SYMBOL Opamps\\LT1013 2064 -1648 R0 SYMATTR InstName U7 SYMBOL res 1568 -1552 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R18 SYMATTR Value 18.7k SYMBOL res 1888 -1408 R0 SYMATTR InstName R19 SYMATTR Value 56k SYMBOL cap 1984 -1344 R0 SYMATTR InstName C24 SYMATTR Value 18n SYMBOL npn -1584 -1120 R0 SYMATTR InstName Q1 SYMATTR Value BC847A SYMBOL npn -1712 -1120 M0 SYMATTR InstName Q2 SYMATTR Value BC847A SYMBOL res -1536 -960 R0 WINDOW 0 41 37 Left 2 WINDOW 3 36 71 Left 2 SYMATTR InstName R20 SYMATTR Value 1.2k SYMATTR SpiceLine tol=0.1 SYMBOL res -1792 -960 R0 WINDOW 0 41 37 Left 2 WINDOW 3 36 71 Left 2 SYMATTR InstName R23 SYMATTR Value 1.2k SYMATTR SpiceLine tol=0.1 SYMBOL FerriteBead -1776 -976 R0 SYMATTR InstName L12 SYMATTR Value 14µ SYMATTR SpiceLine Ipk=3 Rser=0.0122 Rpar=870 Cpar=1000f mfg="Würth Elektronik" pn="7427503 WE-UKW 40060" SYMBOL FerriteBead -1520 -976 R0 SYMATTR InstName L14 SYMATTR Value 14µ SYMATTR SpiceLine Ipk=3 Rser=0.0122 Rpar=870 Cpar=1000f SYMBOL res -2000 -1840 R0 WINDOW 0 43 37 Left 2 WINDOW 3 47 73 Left 2 SYMATTR InstName R24 SYMATTR Value 20k SYMATTR SpiceLine tol=0.1 SYMBOL res -2000 -960 R0 WINDOW 0 43 37 Left 2 WINDOW 3 47 73 Left 2 SYMATTR InstName R25 SYMATTR Value 10k SYMATTR SpiceLine tol=0.1 SYMBOL pnp -1840 -1472 M180 SYMATTR InstName Q3 SYMBOL cap -1840 -1376 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C25 SYMATTR Value 100n SYMBOL res -1792 -1840 R0 WINDOW 0 43 37 Left 2 WINDOW 3 47 73 Left 2 SYMATTR InstName R27 SYMATTR Value 6.65k SYMATTR SpiceLine tol=0.1 SYMBOL res 2384 -1792 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R9 SYMATTR Value 17k SYMBOL res 2416 -1728 R0 SYMATTR InstName R28 SYMATTR Value 68k SYMBOL res -1408 -1776 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R7 SYMATTR Value 215 SYMATTR SpiceLine tol=1 SYMBOL res -1456 -1712 R0 WINDOW 0 43 37 Left 2 WINDOW 3 47 73 Left 2 SYMATTR InstName R29 SYMATTR Value 220 SYMATTR SpiceLine tol=0.1 SYMBOL res -1504 -1968 R0 WINDOW 0 43 37 Left 2 WINDOW 3 47 73 Left 2 SYMATTR InstName R30 SYMATTR Value 13.3k SYMATTR SpiceLine tol=0.1 SYMBOL Opamps\\LT1115 -656 -1504 R0 SYMATTR InstName U3 SYMBOL Opamps\\LT1115 -176 -1584 R0 SYMATTR InstName U8 SYMBOL res -1632 -1968 R0 WINDOW 0 43 37 Left 2 WINDOW 3 47 73 Left 2 SYMATTR InstName R31 SYMATTR Value 47k SYMATTR SpiceLine tol=0.1 TEXT -1424 -776 Left 2 !.MODEL BAS70L D \n+ IS = 3.22E-9 \n+ N = 1.018 \n+ BV = 77 \n+ IBV = 1.67E-7 \n+ RS = 20.89 \n+ CJO =

And I'm using LTSpice XVII(x64)(17.0.37.0) up-dated recently.

I finally got your version to work. As you say, U1 had to be moved into place, but I also had to change C10 on the output of U4. I'd specified the capacitance as 3.3u. but the "u" symbol had vanished. When I specified the capacitance as 3300n everything worked fine.

Lots of turns don't always equate to fine setability. The screw will try to move the brush along the resistive element, but the brush tends to move in fits and starts. I once specified a rather expensive Vishay trimmer which had a split brush that moved more smoothly, and we knocked about twenty minutes off the setting up time for a rather cranky circuit which more than paid for the extra cost of the fancy Vishay trimmer,

Word salad. Of course there are reasons, but you'd indicate what they are if you were trying to be helpful. LTspice does seem to have a limited numbers of words that can be put at the start of a line, and it baulks if it finds anything else at the start of a new line. If it treated that condition as indicative of a line wrap and deleted the preceding new line character we might get somewhere but the fact that it doesn't suggests that the situation might be more complicated than that.

I wasn't responsible for keeping production drawings up to date, and the people who were had a bunch of conflicting priorities to reconcile.

The service engineer who travelled internationally to keep the machines working were forceful personalities who needed the schematics to be rapidly intelligible. I got told off by them from time to time, and got congratulated once or twice.

Of your capacity to make an unhelpful meal of a minor problem.

C10 is definitely 3.3u here. I tried changing it to 3300n but still less than 30us/s when I start the simulation.

Yes I agree. You might easily have the kinds of problems which were solved with anti backlash couplings in the days of drive cords and tuning capacitors.

Exactly. So it shouldn't be hard to have an option (Do you want to treat lines beginning with unknown as wrapped lines Y/N) when it opens a schematic. Line wraps may be CR LF but they can also be only CR or only LF which is why I frequently use the EOL conversion in Notepad++ when moving files between Linux and Windows.

Ok that's one way to avoid the question.

LOL

The long multi-turn trimpots are hard to adjust and expensive, and are no better than single-turns for settability.

Single-turns have much lower HF parasitics too.

Yes particularly if the resistive element is the same length, it may as well be single-turn. Single-turn also has the advantage that you can see where it's set before you adjust it. Multi-turn is usually enclosed so hard to know where it's set before adjustment.

The rectangular multi-turn trimpots have a lot of backlash. A good single is actually more settable. A heap faster too.

We do seem to be using different versions of LTSpice. There are subtle ways the simulation can get screwed up and slowed down. John May emphasised that using trapezoidal integration rather the modified trapezoidal or Gear made a positive difference when you were worried about distortion.

I know what I'd do, but I don't have background information to give a particularly useful response. Everybody has their own opinions on what circuit diagrams ought to look like, and companies need to get their circuit diagrams into a form where the engineers and various sorts of technicians can read them easily, but there's a lot of variation between companies, and I know that US companies made different choices from the UK and Dutch companies that I worked for.

Some of them are quite lot better.

Sometimes true, and sometimes relevant.

Not always true.

There was a line of multi-turn trimming potentiometers with a clear plastic top cover which did let you see where the brush was. Cambridge Instruments bought quite a lot of them. If you thought about what you were doing it wasn't all that much of an advantage.

DSMCZ seems to be an example of a multi-turn trimmer with a translucent case.

Bad choice.

The resistive element in a modern multi-turn trimmer is just a long thin film resistor on an alumina substrate - there's not a lot of RF parastic stray capacitance and inductance in that.

Wound element potentiometers were a lot worse.

Not a wise choice.

Sometimes.

You should be able cope with the backlash. A good multi-turn pontentiometer can be set a lot more precisely than any single turn part, but you have to know what you are buying to get good parts.