* SPICE netlist
R1 vcc N008 53.6k
V2 vcc 0 3.3
R3 N006 N014 {0.44*25k}
XU2 N012 N010 vcc 0 Vout2 OP284 ;pnba In+)In-)V+)V-)OUT
R5 Vout2 N010 1.96Meg
R6 0 N012 1.96Meg
R7 N012 N004 649K
R8 N014 0 49.9
R9 N010 N006 649k
XU1 N007 N002 vcc 0 Vout1 OP284 ;pnba In+)In-)V+)V-)OUT
R4 Vout1 N002 1.96Meg
R10 0 N007 1.96Meg
R11 N007 N006 649k
R12 N002 N004 649k
V1 V_ACC 0 PULSE(0.76V 2.44V 1 2 2 1 6)
R2 N008 N006 {0.56*25k}
R13 N004 V_ACC 32k
R14 N005 Vout1 31.6k
R20 N003 N001 280
Q1 N003 N005 0 0 2N3904
D1 vcc N001 L1C1-RED1000000000
R16 N013 Vout2 31.6k
R15 N011 N009 280
Q2 N011 N013 0 0 2N3904
D2 vcc N009 L1C1-RED1000000000
.tran 12s
;step param A list 0.56

* LTspice schematic (.asc)
Version 4.1
SHEET 1 2416 896
WIRE -1208 -432 -1208 -448
WIRE -1096 -416 -1096 -448
WIRE 1032 -368 1032 -400
WIRE -1208 -320 -1208 -352
WIRE -1096 -288 -1096 -336
WIRE 1032 -256 1032 -304
WIRE 440 -192 376 -192
WIRE 648 -192 520 -192
WIRE -680 -144 -680 -272
WIRE 1032 -128 1032 -176
WIRE 472 -112 472 -128
WIRE -136 -96 -200 -96
WIRE 24 -96 -56 -96
WIRE 264 -96 24 -96
WIRE 376 -96 376 -192
WIRE 376 -96 344 -96
WIRE 440 -96 376 -96
WIRE 648 -80 648 -192
WIRE 648 -80 504 -80
WIRE 792 -80 648 -80
WIRE 968 -80 872 -80
WIRE 184 -64 72 -64
WIRE 344 -64 264 -64
WIRE 440 -64 344 -64
WIRE -680 -32 -680 -64
WIRE 472 -32 472 -48
WIRE 344 32 344 -64
WIRE 440 32 344 32
WIRE 616 32 520 32
WIRE 1192 32 1192 0
WIRE 1032 48 1032 -32
WIRE 616 64 616 32
WIRE -680 112 -680 48
WIRE 72 112 72 -64
WIRE 72 112 -680 112
WIRE 1192 144 1192 96
WIRE -680 192 -680 112
WIRE 424 192 360 192
WIRE 632 192 504 192
WIRE 456 272 456 256
WIRE 1192 272 1192 224
WIRE 72 288 72 112
WIRE 248 288 72 288
WIRE 360 288 360 192
WIRE 360 288 328 288
WIRE 424 288 360 288
WIRE 632 304 632 192
WIRE 632 304 488 304
WIRE 792 304 632 304
WIRE 24 320 24 -96
WIRE 168 320 24 320
WIRE 328 320 248 320
WIRE 424 320 328 320
WIRE 792 320 792 304
WIRE 952 320 792 320
WIRE 1128 320 1032 320
WIRE -680 336 -680 272
WIRE 456 352 456 336
WIRE 328 416 328 320
WIRE 424 416 328 416
WIRE 600 416 504 416
WIRE -680 448 -680 416
WIRE 600 448 600 416
WIRE 1192 448 1192 368
FLAG -1208 -320 0
FLAG -1208 -448 vcc
FLAG -680 -272 vcc
FLAG 456 256 vcc
FLAG 456 352 0
FLAG 600 448 0
FLAG -680 448 0
FLAG 472 -128 vcc
FLAG 472 -32 0
FLAG 616 64 0
FLAG -1096 -288 0
FLAG -1096 -448 V_ACC
FLAG -200 -96 V_ACC
FLAG 648 -80 Vout1
FLAG 632 304 Vout2
FLAG 1032 -400 vcc
FLAG 1032 48 0
FLAG 1192 0 vcc
FLAG 1192 448 0
SYMBOL res -696 -160 R0
SYMATTR InstName R1
SYMATTR Value 53.6k
SYMBOL voltage -1208 -448 R0
SYMATTR InstName V2
SYMATTR Value 3.3
SYMBOL res -696 176 R0
SYMATTR InstName R3
SYMATTR Value {0.44*25k}
SYMBOL OpAmps\\OP284 456 240 R0
SYMATTR InstName U2
SYMBOL res 520 176 R90
SYMATTR InstName R5
SYMATTR Value 1.96Meg
SYMBOL res 520 400 R90
SYMATTR InstName R6
SYMATTR Value 1.96Meg
SYMBOL res 264 304 R90
SYMATTR InstName R7
SYMATTR Value 649K
SYMBOL res -696 320 R0
SYMATTR InstName R8
SYMATTR Value 49.9
SYMBOL res 344 272 R90
SYMATTR InstName R9
SYMATTR Value 649k
SYMBOL OpAmps\\OP284 472 -144 R0
SYMATTR InstName U1
SYMBOL res 536 -208 R90
SYMATTR InstName R4
SYMATTR Value 1.96Meg
SYMBOL res 536 16 R90
SYMATTR InstName R10
SYMATTR Value 1.96Meg
SYMBOL res 280 -80 R90
SYMATTR InstName R11
SYMATTR Value 649k
SYMBOL res 360 -112 R90
SYMATTR InstName R12
SYMATTR Value 649k
SYMBOL voltage -1096 -432 R0
SYMATTR InstName V1
SYMATTR Value PULSE(0.76V 2.44V 1 2 2 1 6)
SYMBOL res -696 -48 R0
SYMATTR InstName R2
SYMATTR Value {0.56*25k}
SYMBOL res -40 -112 R90
SYMATTR InstName R13
SYMATTR Value 32k
SYMBOL res 888 -96 R90
SYMATTR InstName R14
SYMATTR Value 31.6k
SYMBOL res 1048 -160 R180
SYMATTR InstName R20
SYMATTR Value 280
SYMBOL npn 968 -128 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL LED 1016 -368 R0
SYMATTR InstName D1
SYMATTR Value L1C1-RED1000000000
SYMBOL res 1048 304 R90
SYMATTR InstName R16
SYMATTR Value 31.6k
SYMBOL res 1208 240 R180
SYMATTR InstName R15
SYMATTR Value 280
SYMBOL npn 1128 272 R0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL LED 1176 32 R0
SYMATTR InstName D2
SYMATTR Value L1C1-RED1000000000