Here's a variation on the variation by Bill Sloman with sample/hold instead of multi phase rectifier.

Performance does not seem to be any better so unless someone can tell me how to design a better practical sample/hold circuit this
is probably my final post on the subject of sinewave oscillators.
(Which will probably be a relief to some people.)

Operation should be fairly self explanatory. It uses a ringing transformer to open the sample gate for about 10us.

This version uses a comparator for more stable timing characteristics.

D2 etc keeps the comparator output below 40V.

Simulation is very slow for the first few cycles but then speeds up to about 7 ms/s in LTSpice 24.1.7

At least two lines will need to be unwrapped below.

Version 4.1
SHEET 1 3240 2548
WIRE 80 -208 -288 -208
WIRE 800 -208 160 -208
WIRE -288 -96 -288 -208
WIRE 80 -96 -288 -96
WIRE 400 -96 160 -96
WIRE -288 32 -288 -96
WIRE -176 32 -288 32
WIRE -32 32 -96 32
WIRE 48 32 -32 32
WIRE 208 32 128 32
WIRE 256 32 208 32
WIRE 400 32 400 -96
WIRE 400 32 320 32
WIRE 464 32 400 32
WIRE 608 32 544 32
WIRE 656 32 608 32
WIRE 800 32 800 -208
WIRE 800 32 720 32
WIRE 848 32 800 32
WIRE 992 32 928 32
WIRE 1040 32 992 32
WIRE 1184 32 1120 32
WIRE -752 48 -816 48
WIRE -624 48 -688 48
WIRE -288 144 -288 32
WIRE -176 144 -288 144
WIRE 208 144 208 32
WIRE 256 144 208 144
WIRE 608 144 608 32
WIRE 656 144 608 144
WIRE 992 144 992 32
WIRE 1040 144 992 144
WIRE -816 160 -816 48
WIRE -752 160 -816 160
WIRE -624 160 -624 48
WIRE -624 160 -672 160
WIRE -32 160 -32 32
WIRE -32 160 -112 160
WIRE 400 160 400 32
WIRE 400 160 320 160
WIRE 800 160 800 32
WIRE 800 160 720 160
WIRE 1184 160 1184 32
WIRE 1184 160 1104 160
WIRE 1216 160 1184 160
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WIRE 256 176 224 176
WIRE 656 176 624 176
WIRE 1040 176 1008 176
WIRE 224 208 224 176
WIRE 624 208 624 176
WIRE 1008 208 1008 176
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WIRE -816 272 -944 272
WIRE -736 272 -816 272
WIRE -624 288 -624 160
WIRE -624 288 -672 288
WIRE -544 288 -624 288
WIRE -416 288 -480 288
WIRE -288 288 -288 176
WIRE -288 288 -336 288
WIRE -208 288 -288 288
WIRE 208 288 -128 288
WIRE 400 288 400 160
WIRE 400 288 208 288
WIRE -736 304 -816 304
WIRE -816 336 -816 304
WIRE -32 352 -32 160
WIRE -32 352 -288 352
WIRE -1968 400 -1968 304
WIRE -1856 400 -1968 400
WIRE -1664 400 -1776 400
WIRE -32 400 -1600 400
WIRE 208 400 208 288
WIRE 208 400 -32 400
WIRE 800 480 800 160
WIRE 800 480 -128 480
WIRE -1968 496 -1968 400
WIRE -1968 496 -2304 496
WIRE -2432 544 -2432 496
WIRE -2304 560 -2304 496
WIRE -2240 560 -2304 560
WIRE -2144 560 -2176 560
WIRE -1360 576 -1360 480
WIRE -1968 640 -1968 496
WIRE 240 656 48 656
WIRE 1040 656 848 656
WIRE -2304 672 -2304 560
WIRE -2256 672 -2304 672
WIRE -2144 688 -2144 560
WIRE -2144 688 -2192 688
WIRE -2032 688 -2144 688
WIRE -1360 688 -1360 656
WIRE -1104 688 -1104 272
WIRE -1104 688 -1360 688
WIRE -2432 704 -2432 624
WIRE -2256 704 -2432 704
WIRE 848 736 848 656
WIRE 896 736 848 736
WIRE 48 752 48 656
WIRE 96 752 48 752
WIRE 1040 752 1040 656
WIRE 1040 752 960 752
WIRE 1136 752 1040 752
WIRE 1296 752 1136 752
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WIRE 240 768 160 768
WIRE 384 768 240 768
WIRE 576 768 480 768
WIRE 656 768 576 768
WIRE 688 768 656 768
WIRE 864 768 784 768
WIRE 896 768 864 768
WIRE -32 784 -32 400
WIRE 32 784 -32 784
WIRE 96 784 32 784
WIRE -2432 832 -2432 704
WIRE -2432 832 -2544 832
WIRE 864 848 864 768
WIRE -2544 864 -2544 832
WIRE -2432 864 -2432 832
WIRE 464 864 464 816
WIRE 560 864 464 864
WIRE 592 864 560 864
WIRE 704 864 704 816
WIRE 704 864 592 864
WIRE -1360 880 -1360 688
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WIRE -1424 928 -1968 928
WIRE 128 928 128 912
WIRE -2544 960 -2544 928
WIRE 864 992 864 912
WIRE -2432 1008 -2432 944
WIRE 128 1040 128 1008
WIRE 128 1040 16 1040
WIRE 16 1056 16 1040
WIRE -2160 1152 -2160 1040
WIRE -1664 1152 -1664 1040
WIRE 16 1152 16 1120
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WIRE -1968 1200 -2096 1200
WIRE -1904 1200 -1968 1200
WIRE -1728 1200 -1904 1200
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WIRE 128 1200 0 1200
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WIRE 320 1200 272 1200
WIRE 416 1200 400 1200
WIRE 432 1200 416 1200
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WIRE 560 1200 512 1200
WIRE -2480 1216 -2480 1184
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WIRE -2528 1232 -2528 1216
WIRE -1360 1232 -1360 976
WIRE 0 1232 0 1200
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WIRE 192 1232 192 1200
WIRE 272 1232 272 1200
WIRE 560 1232 560 1200
WIRE -2480 1248 -2480 1216
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WIRE 128 1344 0 1344
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WIRE -1664 1360 -1664 1280
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WIRE 144 1408 128 1408
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WIRE 240 1408 208 1408
WIRE -1360 1440 -1360 1328
WIRE -1136 1440 -1232 1440
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WIRE -48 1536 -128 1536
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WIRE 128 1552 32 1552
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WIRE -48 1568 -288 1568
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WIRE 160 1568 128 1568
WIRE 240 1568 224 1568
WIRE 320 1568 240 1568
WIRE 320 1584 320 1568
WIRE 240 1600 240 1568
WIRE -288 1616 -288 1568
WIRE -128 1616 -128 1536
WIRE 128 1616 128 1568
WIRE -976 1632 -976 1520
WIRE -976 1632 -1056 1632
WIRE -832 1632 -976 1632
WIRE -752 1632 -832 1632
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WIRE -2160 1648 -2160 1296
WIRE -1648 1648 -2160 1648
WIRE -1232 1648 -1232 1520
WIRE -1232 1648 -1568 1648
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WIRE -1024 1664 -1056 1664
WIRE -32 1680 -32 1600
WIRE -16 1680 -16 1600
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WIRE 128 1696 -16 1696
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WIRE 240 1696 128 1696
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WIRE 320 1696 240 1696
WIRE -1904 1712 -1904 1200
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WIRE -2160 1760 -2160 1648
WIRE -1968 1760 -2160 1760
WIRE -1024 1776 -1024 1664
WIRE -1904 1888 -1904 1808
WIRE -832 1920 -832 1792
WIRE 1296 1920 1296 752
WIRE 1296 1920 -832 1920
FLAG 224 208 0
FLAG 624 208 0
FLAG -1088 1616 vcc
FLAG -1088 1680 vee
FLAG -2528 1232 0
FLAG -2480 1104 vcc
FLAG -2480 1328 vee
FLAG -144 128 vcc
FLAG -144 192 vee
FLAG 288 128 vcc
FLAG 288 192 vee
FLAG 688 128 vcc
FLAG 688 192 vee
FLAG -2224 656 vcc
FLAG -1968 144 vcc
FLAG -2224 720 vee
FLAG -1360 480 vcc
FLAG -2432 496 vcc
FLAG -2432 1008 0
FLAG -1360 1440 0
FLAG -704 256 vcc
FLAG -704 320 vee
FLAG -816 336 0
FLAG -1664 1504 vee
FLAG -1904 1888 0
FLAG -1664 1040 vcc
FLAG -2160 1040 vcc
FLAG -1024 1776 0
FLAG -2544 960 0
FLAG -496 1632 vee
FLAG -2240 1488 vee
FLAG 1008 208 0
FLAG 1216 160 vout
FLAG 1072 128 vcc
FLAG 1072 192 vee
FLAG 128 912 vcc
FLAG 592 864 gate
FLAG 576 768 source
FLAG 16 1152 0
FLAG 864 992 0
FLAG 928 720 vcc
FLAG 928 784 vee
FLAG 128 736 vcc
FLAG 128 800 vee
FLAG -16 1728 0
FLAG -16 1440 vcc
FLAG -128 1728 0
FLAG -288 1728 0
FLAG 1136 752 hold
FLAG 32 784 sample
SYMBOL res -80 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10K
SYMBOL res 144 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 16K
SYMBOL res 560 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 16K
SYMBOL cap 320 16 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL cap 720 16 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 10n
SYMBOL res 176 -224 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 10K
SYMBOL res 176 -80 M270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R5
SYMATTR Value 82k
SYMBOL cap -1072 1424 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 1000n
SYMBOL res -768 1648 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R10
SYMATTR Value 470k
SYMBOL res -848 1696 R0
SYMATTR InstName R11
SYMATTR Value 68k
SYMBOL voltage -2480 1088 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value 15
SYMBOL voltage -2480 1232 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value 15
SYMBOL OpAmps\\LT1679 -144 160 R0
SYMATTR InstName U5
SYMBOL OpAmps\\LT1679 288 160 R0
SYMATTR InstName U6
SYMBOL OpAmps\\LT1679 688 160 R0
SYMATTR InstName U8
SYMBOL res -112 272 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 10k
SYMBOL res -320 272 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R9
SYMATTR Value 560
SYMBOL cap -480 272 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C8
SYMATTR Value 1000n
SYMBOL res -1088 1536 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R6
SYMATTR Value 100k
SYMBOL cap -1120 1504 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C4
SYMATTR Value 10000n
SYMBOL pnp -2032 736 M180
WINDOW 3 84 0 Left 2
SYMATTR Value 2N3906
SYMATTR InstName Q4
SYMBOL res -1984 208 R0
SYMATTR InstName R12
SYMATTR Value 82k
SYMBOL res -1760 384 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R25
SYMATTR Value 2.7Meg
SYMBOL cap -2176 544 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C7
SYMATTR Value 10p
SYMBOL npn -2096 1152 M0
SYMATTR InstName Q1A
SYMATTR Value NSS40301MDR2G
SYMBOL npn -1728 1152 R0
SYMATTR InstName Q1B
SYMATTR Value NSS40301MDR2G
SYMBOL npn -1424 1232 R0
SYMATTR InstName Q2B
SYMATTR Value NSS40301MDR2G
SYMBOL npn -1968 1712 R0
SYMATTR InstName Q2A
SYMATTR Value NSS40301MDR2G
SYMBOL res -1552 1632 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R28
SYMATTR Value 68k
SYMBOL res -1376 560 R0
SYMATTR InstName R29
SYMATTR Value 100k
SYMBOL res -2448 528 R0
SYMATTR InstName R32
SYMATTR Value 10k
SYMBOL res -2448 848 R0
SYMATTR InstName R33
SYMATTR Value 15k
SYMBOL cap -944 256 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C12
SYMATTR Value 1000n
SYMBOL res -656 144 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 14k
SYMBOL cap -688 32 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C5
SYMATTR Value 10p
SYMBOL cap -1600 384 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C6
SYMATTR Value 100n
SYMBOL res -1648 1456 R180
WINDOW 0 31 76 Left 2
WINDOW 3 31 40 Left 2
SYMATTR InstName R17
SYMATTR Value 22k
SYMBOL OpAmps\\LT1679 -704 288 R0
SYMATTR InstName U2
SYMBOL OpAmps\\LT1679 -1088 1648 M0
SYMATTR InstName U3
SYMBOL OpAmps\\LT1679 -2224 688 R0
SYMATTR InstName U4
SYMBOL cap -2560 864 R0
SYMATTR InstName C9
SYMATTR Value 10n
SYMBOL res -2224 1440 R180
WINDOW 0 31 76 Left 2
WINDOW 3 31 40 Left 2
SYMATTR InstName R20
SYMATTR Value 27k
SYMBOL npn -1424 880 R0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL diode -624 1648 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D7
SYMATTR Value 1N914
SYMBOL res 944 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R26
SYMATTR Value 10k
SYMBOL OpAmps\\LT1679 1072 160 R0
SYMATTR InstName U7
SYMBOL res 1136 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R27
SYMATTR Value 10k
SYMBOL ind2 112 1216 R0
WINDOW 0 -43 36 Left 2
WINDOW 3 -46 73 Left 2
SYMATTR InstName L1
SYMATTR Value 1m
SYMATTR Type ind
SYMATTR SpiceLine Rser=0.45
SYMBOL ind2 208 1328 R180
WINDOW 0 -29 74 Left 2
WINDOW 3 -38 43 Left 2
SYMATTR InstName L2
SYMATTR Value 1m
SYMATTR Type ind
SYMATTR SpiceLine Rser=0.45
SYMBOL res 112 912 R0
SYMATTR InstName R30
SYMATTR Value 33
SYMBOL cap -16 1232 R0
SYMATTR InstName C11
SYMATTR Value 33n
SYMBOL res 544 1216 R0
SYMATTR InstName R31
SYMATTR Value 220
SYMBOL nmos 784 816 M270
WINDOW 0 19 -9 VLeft 2
WINDOW 3 75 84 VLeft 2
SYMATTR InstName M1
SYMATTR Value RSF015N06
SYMBOL nmos 384 816 R270
WINDOW 0 19 -9 VLeft 2
WINDOW 3 75 84 VLeft 2
SYMATTR InstName M2
SYMATTR Value RSF015N06
SYMBOL cap 0 1056 R0
SYMATTR InstName C13
SYMATTR Value 1000n
SYMBOL cap 256 1232 R0
SYMATTR InstName C14
SYMATTR Value 33n
SYMBOL res 416 1184 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R35
SYMATTR Value 470
SYMBOL cap 848 848 R0
SYMATTR InstName C15
SYMATTR Value 100n
SYMBOL res 528 1184 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R37
SYMATTR Value 1k
SYMBOL diode 432 1312 R180
WINDOW 0 23 5 Left 2
WINDOW 3 -102 2 Left 2
SYMATTR InstName D9
SYMATTR Value BAT54HY
SYMBOL cap 144 1392 M90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C0
SYMATTR Value 33p
SYMBOL OpAmps\\LT1679 928 752 R0
SYMATTR InstName U9
SYMBOL OpAmps\\LT1220 128 704 R0
SYMATTR InstName U10
SYMBOL Comparators\\LT1011 -16 1552 R0
SYMATTR InstName U1
SYMBOL res -304 1376 R0
SYMATTR InstName R13
SYMATTR Value 10k
SYMBOL res -304 1600 R0
SYMATTR InstName R14
SYMATTR Value 10k
SYMBOL res -144 1376 R0
SYMATTR InstName R15
SYMATTR Value 10k
SYMBOL res -144 1600 R0
SYMATTR InstName R16
SYMATTR Value 10k
SYMBOL diode 144 1680 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL diode 160 1584 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMATTR Value 1N914
SYMBOL cap 224 1600 R0
SYMATTR InstName C10
SYMATTR Value 33n
SYMBOL res 304 1568 R0
SYMATTR InstName R18
SYMATTR Value 2.2k
TEXT -2792 1560 Left 2 !.tran 0 6 0 1u uic
TEXT -2792 1504 Left 2 !.options plotwinsize=0 numdgt=15
TEXT -1720 8 Left 2 ;Low distortion 1KHz oscillator. ER, JM, BS.\n30 March 2025 - 24 April 2025\nS/H by ER but no better than multi
phase rectifier.
TEXT -2736 48 Left 2 !.MODEL NSS40301MDR2G NPN\n+is=6.87023e-12 bf=445.496 nf=1.08926 vaf=60.529\n+ikf=7.23313 ise=2.38192e-09 ne=4
br=23.6872\n+nr=1.10701 var=8.89608 ikr=1.25064 isc=1e-16 \n+nc=1.13174 rb=905.334,irb=2.30349e-07 rbm=1e-10\n+re=0.00600548
rc=0.0300274 xtb=1.2219 xti=4,\n+eg=1.05 cje=3.80477e-10 vje=0.912237 mje=0.397194,\n+tf=5.90916e-10,xtf=0.0998483,vtf=7.09172,itf=0.010481,\n+cjc=8.35472e-11 vjc=0.702862 mjc=0.43477
xcjc=0.899998\n+fc=0.414631 cjs=0 vjs=0.75 mjs=0.5 \n+tr=5.64658e-08 ptf=0,kf=0 af=1
TEXT 216 1160 Top 2 !K1 L1 L2 0.98
TEXT 136 1144 Left 2 ;Murata 78601/8MC
TEXT 208 1432 Left 2 ;Interwinding capacitance.\nNot a separate component.

--- SoupGate-Win32 v1.05
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