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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: High purity 1kHz oscillator
Date: Tue, 22 Oct 2024 01:10:41 -0400
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But I suspect that component tolerances and mismatched FETs will ruin it.

Otherwise it should be easy to get 60dB down on unwanted harmonics with a better filter.

FWIW I likely won't be here for the next week.

Version 4
SHEET 1 2196 916
WIRE -160 -496 -256 -496
WIRE -16 -496 -160 -496
WIRE 48 -496 -16 -496
WIRE 512 -496 112 -496
WIRE -160 -480 -160 -496
WIRE -256 -464 -256 -496
WIRE -16 -416 -16 -496
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WIRE -48 -368 -160 -368
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WIRE -256 -320 -304 -320
WIRE -160 -256 -256 -256
WIRE -16 -256 -160 -256
WIRE 48 -256 -16 -256
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WIRE -256 -224 -256 -256
WIRE -16 -176 -16 -256
WIRE -304 -128 -304 -320
WIRE -256 -128 -256 -160
WIRE -256 -128 -304 -128
WIRE -160 -128 -160 -160
WIRE -160 -128 -256 -128
WIRE -80 -128 -160 -128
WIRE -48 -128 -80 -128
WIRE 80 -128 48 -128
WIRE 144 -128 144 -368
WIRE 144 -128 80 -128
WIRE 160 -128 144 -128
WIRE 272 -128 240 -128
WIRE 320 -128 272 -128
WIRE 448 -128 400 -128
WIRE -304 -80 -304 -128
WIRE 512 -80 512 -256
WIRE -80 -64 -80 -128
WIRE -32 -64 -80 -64
WIRE 80 -64 80 -128
WIRE 80 -64 48 -64
WIRE 832 -64 720 -64
WIRE 1056 -64 832 -64
WIRE 272 -16 272 -128
WIRE 320 -16 272 -16
WIRE 448 -16 448 -128
WIRE 448 -16 400 -16
WIRE 832 -16 832 -64
WIRE 272 16 272 -16
WIRE 272 16 48 16
WIRE 720 16 720 -64
WIRE -304 32 -304 0
WIRE 128 96 128 80
WIRE -272 112 -352 112
WIRE -208 112 -272 112
WIRE 48 112 48 16
WIRE 96 112 48 112
WIRE 912 112 912 96
WIRE 432 128 160 128
WIRE 448 128 448 -16
WIRE 448 128 432 128
WIRE 512 128 512 0
WIRE 512 128 448 128
WIRE 576 128 512 128
WIRE 704 128 656 128
WIRE 720 128 720 80
WIRE 720 128 704 128
WIRE 752 128 720 128
WIRE 832 128 832 64
WIRE 832 128 816 128
WIRE 880 128 832 128
WIRE 96 144 -80 144
WIRE 1056 144 1056 -64
WIRE 1056 144 944 144
WIRE 1168 144 1056 144
WIRE 1264 144 1168 144
WIRE -352 160 -352 112
WIRE 880 160 848 160
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WIRE 128 176 128 160
WIRE 912 192 912 176
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WIRE 16 224 -80 224
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WIRE 432 224 432 128
WIRE 432 224 384 224
WIRE -80 240 -80 224
WIRE 16 240 16 224
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WIRE -352 336 -432 336
WIRE -80 336 -80 320
WIRE -32 336 -80 336
WIRE 16 336 16 304
WIRE 16 336 -32 336
WIRE -432 352 -432 336
WIRE -352 352 -352 336
WIRE -208 352 -208 240
WIRE -208 352 -352 352
WIRE 704 352 704 288
WIRE -32 368 -32 336
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WIRE -208 448 -208 352
WIRE -352 608 -352 512
WIRE -272 608 -352 608
WIRE -208 608 -208 512
WIRE -208 608 -272 608
FLAG -432 352 0
FLAG 1168 144 output
FLAG -304 32 0
FLAG 848 256 0
FLAG 704 352 0
FLAG 912 96 V+
FLAG 912 192 V-
FLAG 128 80 V+
FLAG 128 176 V-
FLAG -272 112 V+
FLAG -272 608 V-
FLAG -32 368 0
SYMBOL voltage -352 144 R0
WINDOW 123 0 0 Left 0
WINDOW 39 10 135 Left 2
WINDOW 0 12 7 Left 2
WINDOW 3 15 104 Left 2
SYMATTR SpiceLine Rser=0.1
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL res 400 208 R90
WINDOW 0 -7 54 VBottom 2
WINDOW 3 37 50 VTop 2
SYMATTR InstName R1
SYMATTR Value 10.5k
SYMBOL cap 288 208 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 15n
SYMBOL cap 32 304 R180
WINDOW 0 -33 54 Left 2
WINDOW 3 -49 18 Left 2
SYMATTR InstName C2
SYMATTR Value 15n
SYMBOL polcap -224 176 R0
SYMATTR InstName C4
SYMATTR Value 100µ
SYMBOL OpAmps\\LT1057 128 64 R0
SYMATTR InstName U2
SYMBOL res -176 -256 R0
SYMATTR InstName R6
SYMATTR Value 47k
SYMBOL res 256 -144 R90
WINDOW 0 -1 46 VBottom 2
WINDOW 3 35 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 6.34k
SYMBOL res 416 -144 R90
WINDOW 0 -4 61 VBottom 2
WINDOW 3 39 55 VTop 2
SYMATTR InstName R8
SYMATTR Value 13k
SYMBOL schottky 48 -240 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL njf 48 -176 R90
WINDOW 0 -37 23 VRight 2
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