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

On 18/12/2024 10:44 pm, Bill Sloman wrote:

On 18/12/2024 5:16 pm, bitrex wrote:

On 12/17/2024 10:49 PM, Bill Sloman wrote:

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.

>
It seems to like to squeg for me (LTSpice 17.0.37)
>
<https://imgur.com/a/6uqsw1H>

 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.

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.
Version 4
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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, Sydney