Version 4
SHEET 1 1740 680
WIRE 608 32 528 32
WIRE 1008 32 928 32
WIRE 928 96 928 32
WIRE 1024 96 992 96
WIRE 432 128 336 128
WIRE 800 128 704 128
WIRE 0 176 0 160
WIRE 0 176 -32 176
WIRE 336 176 336 128
WIRE 352 176 336 176
WIRE 704 176 704 128
WIRE 720 176 704 176
WIRE -32 192 -32 176
WIRE 0 192 0 176
WIRE 432 192 432 128
WIRE 432 192 416 192
WIRE 528 192 528 32
WIRE 528 192 512 192
WIRE 544 192 528 192
WIRE 800 192 800 128
WIRE 800 192 784 192
WIRE 832 192 800 192
WIRE 928 192 928 96
WIRE 928 192 912 192
WIRE 944 192 928 192
WIRE 320 208 208 208
WIRE 352 208 320 208
WIRE 688 208 688 32
WIRE 688 208 608 208
WIRE 720 208 688 208
WIRE 1024 208 1024 96
WIRE 1024 208 1008 208
WIRE 1088 208 1088 32
WIRE 544 224 528 224
WIRE 944 224 928 224
WIRE 208 240 208 208
WIRE 320 240 320 208
WIRE 528 256 528 224
WIRE 928 256 928 224
FLAG 208 400 0
FLAG -32 192 0
FLAG 0 80 U+
FLAG 0 272 U-
FLAG 384 160 U+
FLAG 384 224 U-
FLAG 320 304 0
FLAG 576 176 U+
FLAG 576 240 U-
FLAG 528 256 0
FLAG 208 208 Ui
FLAG 1088 32 Ua
FLAG 688 32 Uz
FLAG 752 160 U+
FLAG 752 224 U-
FLAG 976 176 U+
FLAG 976 240 U-
FLAG 928 256 0
SYMBOL voltage 0 64 R0
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL voltage 0 176 R0
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL voltage 208 304 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value PULSE(0 1 0 0 0 1n)
SYMBOL cap 304 240 R0
SYMATTR InstName C1
SYMATTR Value 12p
SYMBOL ind 192 224 R0
SYMATTR InstName L1
SYMATTR Value 100m
SYMBOL Opamps\\UniversalOpamp2 576 208 R0
SYMATTR InstName U2
SYMBOL res 704 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 100k
SYMBOL res 528 176 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL res 1104 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 100k
SYMBOL res 928 176 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL diode 1024 224 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL diode 928 112 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL Opamps\\UniversalOpamp2 384 192 R0
SYMATTR InstName U1
SYMBOL Opamps\\UniversalOpamp2 752 192 R0
SYMATTR InstName U3
SYMBOL Opamps\\UniversalOpamp2 976 208 R0
SYMATTR InstName U4
TEXT -56 344 Left 2 !.tran 0 100u 0 1n