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:

Here's another variation. This one take's John May's advice and spreads the phase shift oscillator over three op amps, all operating with the non-inverting input grounded.
U1 now has only one 3.3pF frequency compensation capacitor - the simulation started slowing down to picoseconds per second from time to time, and this made it happen less often. The two compensation capacitor scheme would probably be fine in real life.
The circuit takes a long time to settle down to stable operation - about 5 seconds,and that after I cut the integrating capacitor from 6.8uF to 680nF and put in D4 to minimise the initial overshoot on the FET gate drive - and the performance isn't wonderful. The second and third harmonics are about 75dB below the fundamental and 65dB down respectively. I'll play about a bit more but the main charm of the circuit is that it is easy to explain what each bit does.
Version 4
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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 diode 2704 -1632 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D4
SYMATTR Value 1N4148
SYMBOL res -1072 -1728 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 56
SYMATTR SpiceLine tol=1
TEXT -1960 -904 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
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Bill Sloman, Sydney