Version 4
SHEET 1 4596 5064
WIRE 704 416 704 336
WIRE 848 416 848 336
WIRE 704 576 704 496
WIRE 848 576 848 496
WIRE 1376 688 1072 688
WIRE 1744 688 1456 688
WIRE 1200 752 1152 752
WIRE 1296 752 1264 752
WIRE 1152 784 1152 752
WIRE 1152 832 1152 784
WIRE 2016 832 1920 832
WIRE 2160 832 2080 832
WIRE 944 848 864 848
WIRE 1072 848 1072 688
WIRE 1072 848 1024 848
WIRE 1120 848 1072 848
WIRE 1120 880 1056 880
WIRE 1152 928 1152 896
WIRE 1760 928 1744 928
WIRE 1824 928 1760 928
WIRE 1920 928 1920 832
WIRE 1920 928 1904 928
WIRE 1952 928 1920 928
WIRE 2160 944 2160 832
WIRE 2160 944 2016 944
WIRE 2176 944 2160 944
WIRE 2272 944 2256 944
WIRE 2320 944 2272 944
WIRE 2464 944 2400 944
WIRE 1152 960 1152 928
WIRE 1952 960 1920 960
WIRE 1920 1024 1920 960
WIRE 1056 1056 1056 880
WIRE 1152 1056 1152 1024
WIRE 1152 1056 1056 1056
WIRE 1344 1056 1152 1056
WIRE 2880 1056 2784 1056
WIRE 3024 1056 2960 1056
WIRE 1056 1072 1056 1056
WIRE 2272 1136 2272 944
WIRE 2320 1136 2272 1136
WIRE 2464 1152 2464 944
WIRE 2464 1152 2384 1152
WIRE 2688 1152 2464 1152
WIRE 2784 1152 2784 1056
WIRE 2784 1152 2752 1152
WIRE 2816 1152 2784 1152
WIRE 2320 1168 2304 1168
WIRE 3024 1168 3024 1056
WIRE 3024 1168 2880 1168
WIRE 3136 1168 3024 1168
WIRE 2016 1184 1920 1184
WIRE 2160 1184 2080 1184
WIRE 2816 1184 2784 1184
WIRE 688 1232 688 1152
WIRE 832 1232 832 1152
WIRE 2304 1232 2304 1168
WIRE 2784 1248 2784 1184
WIRE 1824 1280 1744 1280
WIRE 1920 1280 1920 1184
WIRE 1920 1280 1904 1280
WIRE 1952 1280 1920 1280
WIRE 2160 1296 2160 1184
WIRE 2160 1296 2016 1296
WIRE 2192 1296 2160 1296
WIRE 2272 1296 2272 1136
WIRE 1952 1312 1920 1312
WIRE 1920 1376 1920 1312
WIRE 688 1392 688 1312
WIRE 832 1392 832 1312
FLAG 1056 1072 0
FLAG 1296 752 0
FLAG 864 848 pos
FLAG 688 1152 pos
FLAG 832 1392 neg
FLAG 832 1152 0
FLAG 688 1392 0
FLAG 704 336 Vsupply+
FLAG 848 576 Vsupply-
FLAG 848 336 0
FLAG 704 576 0
FLAG 1152 784 Vsupply+
FLAG 1152 928 Vsupply-
FLAG 1984 912 Vsupply+
FLAG 1984 976 Vsupply-
FLAG 1920 1024 0
FLAG 1984 1264 Vsupply+
FLAG 1984 1328 Vsupply-
FLAG 1920 1376 0
FLAG 2304 1232 0
FLAG 2352 1120 Vsupply+
FLAG 2352 1184 Vsupply-
FLAG 2848 1136 Vsupply+
FLAG 2848 1200 Vsupply-
FLAG 2784 1248 0
FLAG 1760 928 pos
FLAG 1744 1280 pos
SYMBOL Opamps\\AD712 1152 800 R0
SYMATTR InstName U9
SYMBOL res 1040 832 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R14
SYMATTR Value 10000
SYMBOL res 1472 672 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R15
SYMATTR Value 10000
SYMBOL cap 1264 736 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 100n
SYMBOL cap 1168 1024 R180
WINDOW 0 45 35 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C4
SYMATTR Value 100n
SYMBOL voltage 688 1216 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 0.5
SYMBOL voltage 832 1216 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 0.5
SYMBOL voltage 704 400 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value 15
SYMBOL voltage 848 400 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value 15
SYMBOL Opamps\\LT1209 1984 880 R0
SYMATTR InstName U2
SYMBOL diode 2016 848 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL res 1920 912 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 10000
SYMBOL Opamps\\LT1209 1984 1232 R0
SYMATTR InstName U1
SYMBOL diode 2016 1200 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL res 1920 1264 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10000
SYMBOL res 2272 928 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 10000
SYMBOL res 2288 1280 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 10000
SYMBOL Opamps\\LT1209 2352 1088 R0
SYMATTR InstName U4
SYMBOL res 2416 928 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 10000
SYMBOL Opamps\\LT1209 2848 1104 R0
SYMATTR InstName U3
SYMBOL res 2976 1040 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 10000
SYMBOL diode 2688 1168 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D3
SYMATTR Value 1N4148
TEXT 656 1488 Left 2 !.tran 0 1m 0 1u