Version 4
SHEET 1 1688 680
WIRE 1120 -288 1088 -288
WIRE 1216 -288 1200 -288
WIRE 1440 -288 1424 -288
WIRE 1552 -288 1520 -288
WIRE 448 -240 400 -240
WIRE 560 -240 528 -240
WIRE 688 -240 640 -240
WIRE 832 -240 688 -240
WIRE 1152 -240 832 -240
WIRE 1488 -240 1152 -240
WIRE 1152 -160 1152 -240
WIRE 608 -144 576 -144
WIRE 928 -144 896 -144
WIRE 1088 -144 1088 -288
WIRE 1088 -144 1072 -144
WIRE 1120 -144 1088 -144
WIRE 1488 -144 1488 -240
WIRE 832 -128 832 -240
WIRE 1216 -128 1216 -288
WIRE 1216 -128 1184 -128
WIRE 1248 -128 1216 -128
WIRE 1328 -128 1248 -128
WIRE 1424 -128 1424 -288
WIRE 1424 -128 1408 -128
WIRE 1456 -128 1424 -128
WIRE 400 -112 400 -240
WIRE 576 -112 576 -144
WIRE 1120 -112 1088 -112
WIRE 1552 -112 1552 -288
WIRE 1552 -112 1520 -112
WIRE 1616 -112 1552 -112
WIRE 1456 -96 1424 -96
WIRE 832 -64 832 -80
WIRE 928 -64 832 -64
WIRE 1088 -64 1088 -112
WIRE 1088 -64 928 -64
WIRE 1424 -64 1424 -96
WIRE 1424 -64 1088 -64
WIRE 832 -48 832 -64
WIRE 688 -32 688 -240
WIRE 928 -32 928 -64
WIRE 1248 -32 1248 -128
WIRE 1616 -32 1248 -32
WIRE 400 48 400 -32
WIRE 576 48 576 -32
WIRE 688 48 688 32
WIRE 832 48 832 16
WIRE 928 48 928 32
WIRE 1152 48 1152 -96
WIRE 1488 48 1488 -80
FLAG 400 48 0
FLAG 832 48 0
FLAG 832 -240 Vz
FLAG 1152 48 0
FLAG 1488 48 0
FLAG 1616 -112 out
FLAG 1616 -32 out_
FLAG 896 -144 IN
FLAG 688 48 0
FLAG 928 48 0
FLAG 576 48 0
FLAG 608 -144 IN
SYMBOL res 432 -224 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 544 -224 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 22k
SYMBOL voltage 400 -128 R0
WINDOW 123 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 300
SYMBOL zener 848 -64 R180
WINDOW 0 24 64 Left 2
WINDOW 3 68 2 VRight 2
SYMATTR InstName D2
SYMATTR Value UDZV20B
SYMBOL zener 848 16 R180
WINDOW 0 24 64 Left 2
WINDOW 3 65 -54 VRight 2
SYMATTR InstName D1
SYMATTR Value UDZV20B
SYMBOL Opamps\\LT1462 1152 -192 R0
SYMATTR InstName U1
SYMBOL Opamps\\LT1462 1488 -176 R0
SYMATTR InstName U2
SYMBOL res 1536 -304 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL res 1216 -304 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 27k
SYMBOL res 1424 -144 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL res 1088 -160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 18k
SYMBOL cap 992 -160 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value .1µF
SYMBOL cap 912 -32 R0
SYMATTR InstName C2
SYMATTR Value .1µF
SYMBOL cap 672 -32 R0
SYMATTR InstName C3
SYMATTR Value .1µF
SYMBOL voltage 576 -128 R0
WINDOW 3 -42 -3 VRight 2
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value SINE(0 2 800)
TEXT 392 176 Left 2 !.tran 20m
TEXT 400 144 Left 2 !.op