Version 4
SHEET 1 880 680
WIRE -96 0 -96 -32
WIRE 48 0 48 -32
WIRE -96 112 -96 80
WIRE 48 112 48 80
WIRE 240 128 224 128
WIRE 224 160 224 128
WIRE 192 176 144 176
WIRE 336 192 256 192
WIRE 352 192 336 192
WIRE 432 192 416 192
WIRE 512 192 432 192
WIRE -80 208 -96 208
WIRE 0 208 -80 208
WIRE 144 208 80 208
WIRE 192 208 144 208
WIRE 224 272 224 224
WIRE 240 272 224 272
WIRE -96 288 -96 208
WIRE 144 336 144 208
WIRE 192 336 144 336
WIRE 336 336 336 192
WIRE 336 336 256 336
WIRE -96 416 -96 368
WIRE 144 448 144 336
WIRE 192 448 144 448
WIRE 432 448 432 192
WIRE 432 448 272 448
FLAG 144 176 0
FLAG -80 208 Ue
FLAG 512 192 Ua
FLAG -96 112 0
FLAG 48 112 0
FLAG -96 -32 +Ub
FLAG 48 -32 -Ub
FLAG 240 128 -Ub
FLAG 240 272 +Ub
FLAG -96 416 0
SYMBOL Opamps\\UniversalOpamp2 224 192 M180
SYMATTR InstName U1
SYMBOL diode 352 208 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMBOL diode 192 352 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMBOL res 176 464 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res -16 224 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL voltage -96 -16 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL voltage 48 96 R180
WINDOW 0 24 96 Left 2
WINDOW 3 24 16 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 15
SYMBOL voltage -96 272 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value PULSE(-4 4 0 1 1 0)
TEXT -130 498 Left 2 !.tran 2