Version 4
SHEET 1 3100 680
WIRE 144 -336 -64 -336
WIRE 224 -336 144 -336
WIRE 1616 -320 416 -320
WIRE 2160 -320 1616 -320
WIRE 2448 -320 2160 -320
WIRE 2768 -320 2448 -320
WIRE 2944 -320 2768 -320
WIRE 1616 -304 1616 -320
WIRE 2944 -288 2944 -320
WIRE 2448 -272 2448 -320
WIRE 2768 -272 2768 -320
WIRE 2160 -256 2160 -320
WIRE 960 -192 832 -192
WIRE 1152 -192 1040 -192
WIRE 2448 -160 2448 -208
WIRE 2768 -160 2768 -208
WIRE 144 -128 144 -336
WIRE 2160 -128 2160 -176
WIRE 2224 -128 2160 -128
WIRE 2352 -128 2304 -128
WIRE 1152 -112 1152 -192
WIRE 1200 -112 1152 -112
WIRE 1328 -112 1264 -112
WIRE 1472 -112 1408 -112
WIRE 304 -80 304 -336
WIRE 496 -80 304 -80
WIRE 624 -80 496 -80
WIRE 832 -80 832 -192
WIRE 832 -80 688 -80
WIRE 928 -80 832 -80
WIRE 1008 -80 1008 -112
WIRE 928 -64 928 -80
WIRE 976 -64 928 -64
WIRE 2160 -64 2160 -128
WIRE 2448 -64 2448 -80
WIRE 2768 -64 2768 -80
WIRE 2768 -64 2448 -64
WIRE 2944 -64 2944 -208
WIRE 2944 -64 2768 -64
WIRE 1152 -48 1152 -112
WIRE 1152 -48 1040 -48
WIRE 1808 -48 1808 -96
WIRE 976 -32 928 -32
WIRE 1472 -32 1472 -112
WIRE 1776 -32 1472 -32
WIRE 144 -16 144 -48
WIRE 416 -16 416 -320
WIRE 416 -16 144 -16
WIRE 1904 -16 1840 -16
WIRE 1984 -16 1904 -16
WIRE 2096 -16 2064 -16
WIRE 2352 -16 2352 -128
WIRE 2384 -16 2352 -16
WIRE 496 0 496 -80
WIRE 496 0 432 0
WIRE 624 0 496 0
WIRE 736 0 688 0
WIRE 928 0 928 -32
WIRE 928 0 736 0
WIRE 1152 0 1152 -48
WIRE 1200 0 1152 0
WIRE 1328 0 1264 0
WIRE 1472 0 1472 -32
WIRE 1472 0 1408 0
WIRE 1616 0 1616 -224
WIRE 1696 0 1616 0
WIRE 1776 0 1696 0
WIRE 736 32 736 0
WIRE 832 32 832 -80
WIRE 432 48 432 0
WIRE 496 48 496 0
WIRE 960 64 960 32
WIRE 1008 64 1008 -16
WIRE 1008 64 960 64
WIRE 1472 64 1472 0
WIRE 1760 96 1760 64
WIRE 1808 96 1808 16
WIRE 1808 96 1760 96
WIRE -64 128 -64 -336
WIRE 0 128 0 96
WIRE 0 128 -64 128
WIRE 144 128 144 -16
WIRE 208 128 208 96
WIRE 208 128 144 128
WIRE -256 144 -256 48
WIRE -64 144 -64 128
WIRE 144 144 144 128
WIRE 1696 144 1696 0
WIRE 1760 144 1696 144
WIRE 1904 144 1904 -16
WIRE 1904 144 1840 144
WIRE 1616 176 1616 0
WIRE -256 288 -256 224
WIRE -64 288 -64 224
WIRE -64 288 -256 288
WIRE 144 288 144 224
WIRE 144 288 -64 288
WIRE 432 288 432 112
WIRE 432 288 144 288
WIRE 496 288 496 112
WIRE 496 288 432 288
WIRE 736 288 736 112
WIRE 736 288 496 288
WIRE 832 288 832 112
WIRE 832 288 736 288
WIRE 1472 288 1472 128
WIRE 1472 288 832 288
WIRE 1616 288 1616 240
WIRE 1616 288 1472 288
WIRE 2160 288 2160 32
WIRE 2160 288 1616 288
WIRE 2448 288 2448 32
WIRE 2448 288 2160 288
WIRE 832 320 832 288
FLAG 0 96 Trafo
FLAG 208 96 Ext
FLAG 832 320 0
FLAG 1808 -96 Ext
FLAG 1008 -112 Ext
FLAG -256 48 -12
FLAG 960 32 -12
FLAG 1760 64 -12
SYMBOL voltage -64 128 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 20
SYMBOL voltage 144 128 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL res 128 -144 R0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL res 320 -352 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 60k
SYMBOL diode 480 48 R0
SYMATTR InstName D1
SYMATTR Value MURS120
SYMBOL diode 448 112 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value MURS120
SYMBOL diode 624 16 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D3
SYMATTR Value 1N4148
SYMBOL diode 688 -96 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D4
SYMATTR Value 1N4148
SYMBOL res 720 16 R0
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL res 816 16 R0
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL res 1056 -208 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 100k
SYMBOL diode 1264 -128 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D5
SYMATTR Value 1N4148
SYMBOL diode 1200 16 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D6
SYMATTR Value 1N4148
SYMBOL res 1424 -128 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 100k
SYMBOL res 1424 -16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 3k3
SYMBOL cap 1456 64 R0
SYMATTR InstName C1
SYMATTR Value 10ľ
SYMBOL res 1600 -320 R0
SYMATTR InstName R9
SYMATTR Value 10k
SYMBOL diode 1600 176 R0
SYMATTR InstName D7
SYMATTR Value 1N4148
SYMBOL res 1856 128 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R10
SYMATTR Value 100k
SYMBOL Opamps\\LT1001 1008 -112 R0
SYMATTR InstName U1
SYMBOL Opamps\\LT1001 1808 -80 R0
SYMATTR InstName U2
SYMBOL voltage -256 128 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value -12
SYMBOL res 2080 -32 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R11
SYMATTR Value 10k
SYMBOL res 2176 -160 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R12
SYMATTR Value 10k
SYMBOL res 2208 -112 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R13
SYMATTR Value 1k
SYMBOL res 2464 -64 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R14
SYMATTR Value 1k
SYMBOL npn 2096 -64 R0
SYMATTR InstName Q1
SYMATTR Value BC337-40
SYMBOL npn 2384 -64 R0
SYMATTR InstName Q2
SYMATTR Value BC337-40
SYMBOL LED 2432 -272 R0
SYMATTR InstName D8
SYMATTR Value NSCW100
SYMBOL LED 2752 -272 R0
SYMATTR InstName D9
SYMBOL res 2928 -304 R0
SYMATTR InstName R1
SYMATTR Value 720
SYMBOL res 2752 -176 R0
SYMATTR InstName R15
SYMATTR Value 500
TEXT -98 344 Left 2 !.tran 10