Re: Final final 1kHz oscillator

On 18/11/2024 2:58 pm, Edward Rawde wrote:

"JM" <sunaecoNoChoppedPork@gmail.com> wrote in message news:n7iijjdeqecl0kmub0bq5in0dbm60m7qam@4ax.com...

On Thu, 14 Nov 2024 11:14:28 -0500, "Edward Rawde"
<invalid@invalid.invalid> wrote:
>

"JM" <sunaecoNoChoppedPork@gmail.com> wrote in message news:t5fajjdteskfftvkf84iqsp2vc4b9ta5kj@4ax.com...

On Fri, 8 Nov 2024 15:43:41 -0500, "Edward Rawde"
<invalid@invalid.invalid> wrote:

I've taken John May seriously, and reworked my phase shift oscillator to use three op amps, all with their non-inverting inputs tied to ground.
The results aren't all that impressive, the lower harmonics are about 65dB below the fundamental. Start-up is slow - it takes about five seconds of simulation before the circuit settles down into steady state operation, and that after I dropped the integrating capacitor from 6.8uF to 680nF. The nice thing about the circuit is that I can explain what each bit is doing. I can see a few tweaks that might be worth trying.
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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 -640 -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 npn -1888 -1152 R0
SYMATTR InstName Q1
SYMATTR Value BC547B
SYMBOL npn -1984 -1152 M0
SYMATTR InstName Q2
SYMATTR Value BC547B
SYMBOL res -1840 -1024 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R23
SYMATTR Value 1.2k
SYMATTR SpiceLine tol=0.1
SYMBOL res -2064 -1024 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R24
SYMATTR Value 1.2k
SYMATTR SpiceLine tol=0.1
SYMBOL res -2064 -1392 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R25
SYMATTR Value 6.8k
SYMATTR SpiceLine tol=0.1
SYMBOL res 2512 -1344 R0
WINDOW 0 41 41 Left 2
WINDOW 3 47 81 Left 2
SYMATTR InstName R26
SYMATTR Value 100k
SYMATTR SpiceLine tol=0.1
SYMBOL res -1072 -1728 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 82
TEXT -1712 -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 -432 -408 Left 2 !.tran 0 10s 0 startup
TEXT -720 -408 Left 2 !.lib LME49710.lib