Sample/hold variation of Bill Sloman's variation of the 1kHz sinewave oscillator

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
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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
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FLAG -1360 480 vcc
FLAG -2432 496 vcc
FLAG -2432 1008 0
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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.