Version 4
SHEET 1 880 680
WIRE 192 -64 160 -64
WIRE 352 -64 272 -64
WIRE 608 -64 416 -64
WIRE 160 32 160 -64
WIRE 208 32 160 32
WIRE 304 32 272 32
WIRE 336 32 304 32
WIRE 480 32 448 32
WIRE 608 32 608 -64
WIRE 608 32 560 32
WIRE 544 128 544 112
WIRE 240 144 240 128
WIRE 512 144 480 144
WIRE 32 160 -16 160
WIRE 160 160 160 32
WIRE 160 160 112 160
WIRE 208 160 160 160
WIRE 608 160 608 32
WIRE 608 160 576 160
WIRE 640 160 608 160
WIRE 304 176 304 32
WIRE 304 176 272 176
WIRE 336 176 304 176
WIRE 448 176 448 32
WIRE 448 176 416 176
WIRE 512 176 448 176
WIRE -16 192 -16 160
WIRE 208 192 160 192
WIRE 544 208 544 192
WIRE 160 224 160 192
WIRE 240 224 240 208
WIRE 480 224 480 144
WIRE -16 304 -16 272
WIRE 320 352 320 336
WIRE 464 352 464 336
WIRE 320 448 320 432
WIRE 464 448 464 432
FLAG 240 128 +V
FLAG 240 224 -V
FLAG 480 224 0
FLAG 160 224 0
FLAG -16 304 0
FLAG 464 448 0
FLAG 320 448 0
FLAG 320 336 +V
FLAG 464 336 -V
FLAG 544 112 +V
FLAG 544 208 -V
FLAG 336 32 out1
FLAG 640 160 out2
SYMBOL Opamps\\UniversalOpamp2 240 176 R0
SYMATTR InstName U1
SYMBOL Misc\\EuropeanResistor 16 176 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 20k
SYMBOL Misc\\EuropeanResistor 176 -48 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor 320 192 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor 464 48 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 20k
SYMBOL diode 352 -48 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL Opamps\\UniversalOpamp2 544 160 R0
SYMATTR InstName U2
SYMBOL voltage 320 336 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL voltage 464 336 R0
SYMATTR InstName V2
SYMATTR Value -5
SYMBOL cap 208 48 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C1
SYMATTR Value 100n
SYMBOL voltage -16 176 R0
SYMATTR InstName V3
SYMATTR Value 2
TEXT -32 400 Left 2 !.tran 20m startup
TEXT 504 -112 Left 2 ;R4 > R3
TEXT 16 88 Left 2 ;R1>=10k