LTSpice simulations for discrete LM3909 circuit variations

Discrete LM3909 - D2 Q1.asc

Version 4
SHEET 1 1816 760
WIRE 64 -16 0 -16
WIRE 112 -16 64 -16
WIRE 272 -16 112 -16
WIRE 544 -16 272 -16
WIRE 1024 -16 544 -16
WIRE 1200 -16 1024 -16
WIRE 112 0 112 -16
WIRE 272 0 272 -16
WIRE 1024 32 1024 -16
WIRE 1200 32 1200 -16
WIRE 0 48 0 -16
WIRE 544 48 544 -16
WIRE 944 80 864 80
WIRE 960 80 944 80
WIRE 1136 80 1104 80
WIRE 272 96 272 80
WIRE 400 96 272 96
WIRE 480 96 400 96
WIRE 400 112 400 96
WIRE 112 128 112 80
WIRE 272 128 272 96
WIRE 688 128 640 128
WIRE 800 128 752 128
WIRE 944 144 944 80
WIRE 1024 144 1024 128
WIRE 1024 144 944 144
WIRE 1104 144 1104 80
WIRE 1104 144 1024 144
WIRE 112 160 112 128
WIRE 864 192 864 176
WIRE 912 192 864 192
WIRE 0 208 0 128
WIRE 400 208 400 192
WIRE 640 208 640 128
WIRE 640 208 400 208
WIRE 400 224 400 208
WIRE 112 272 112 224
WIRE 128 272 112 272
WIRE 224 272 192 272
WIRE 272 272 272 208
WIRE 272 272 224 272
WIRE 912 272 912 192
WIRE 400 336 400 304
WIRE 544 336 544 144
WIRE 544 336 400 336
WIRE 112 368 112 272
WIRE 912 368 912 352
WIRE 912 368 112 368
WIRE 272 400 272 272
WIRE 112 416 112 368
WIRE 1200 448 1200 128
WIRE 1200 448 336 448
WIRE 112 464 112 416
WIRE 400 480 400 336
WIRE 0 496 0 288
WIRE 0 496 -32 496
WIRE -32 528 -32 496
WIRE 0 576 0 496
WIRE 64 576 0 576
WIRE 112 576 112 544
WIRE 112 576 64 576
WIRE 272 576 272 496
WIRE 272 576 112 576
WIRE 400 576 400 560
WIRE 400 576 272 576
FLAG -32 528 0
FLAG 112 128 P6-RLIM
FLAG 112 416 P18-RC
FLAG 224 272 P2-OUT
FLAG 64 -16 P5-V+
FLAG 64 576 P4-V-
SYMBOL res 96 -16 R0
SYMATTR InstName R1
SYMATTR Value 39
SYMBOL LED 96 160 R0
SYMATTR InstName D1
SYMATTR Value LXHL-BW02
SYMBOL res 96 448 R0
SYMATTR InstName R2
SYMATTR Value 9.1k
SYMBOL cap 192 256 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
WINDOW 40 52 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 1m
SYMATTR SpiceLine2 ic=0.5
SYMBOL res 256 112 R0
SYMATTR InstName R5
SYMATTR Value 390
SYMBOL res 256 -16 R0
SYMATTR InstName R4
SYMATTR Value 390
SYMBOL npn 336 400 M0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL res 384 96 R0
SYMATTR InstName R6
SYMATTR Value 20k
SYMBOL res 384 208 R0
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL res 384 464 R0
SYMATTR InstName R8
SYMATTR Value 20k
SYMBOL npn 480 48 R0
SYMATTR InstName Q4
SYMATTR Value 2N3904
SYMBOL npn 800 80 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL pnp 960 128 M180
SYMATTR InstName Q2a
SYMATTR Value 2N3906
SYMBOL voltage 0 192 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 116 Left 2
SYMATTR InstName V1
SYMATTR Value 1.5
SYMBOL res 896 256 R0
SYMATTR InstName R9
SYMATTR Value 100
SYMBOL pnp 1136 128 M180
SYMATTR InstName Q2b
SYMATTR Value 2N3906
SYMBOL res -16 32 R0
SYMATTR InstName PTC
SYMATTR Value 5
SYMBOL diode 688 144 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMATTR Value 1N4148
TEXT -56 192 VRight 2 ;AA Alkaline
TEXT 512 528 Left 2 !.tran 30
TEXT 504 496 Left 2 ;Pins 3 and 7 = no connect
TEXT 760 488 Left 2 ;Sorted by Vd at If=20 mA                                                                                        \n                                                                                                \nPart #                   Mfg             Is (A)              N               Iave (A)     Vf@Iave (V)    Vd@If (V)\nQTLP690C            Fairchild       1.00E-22        1.500         0.16           1.90                 1.82\nPT-121-B              Luminous     4.35E-07       8.370        20.00           3.84                 2.34\nLUW-W5AP          OSRAM           6.57E-08       7.267         2.00           3.26                 2.39\nLXHL-BW02         Lumileds       4.50E-20       2.600         0.40           2.95                 2.75\nW5AP-LZMZ-5K  Lumileds       3.50E-17       3.120          2.00           3.13                 2.76\nLXK2-PW14          Lumileds       3.50E-17       3.120        1.60           3.11                 2.76\nAOT-2015            AOT                  5.96E-10       6.222         0.18          3.16                 2.80\nNSSW008CT-P    Nichia             2.30E-16       3.430        0.04           2.92                 2.86\nNSSWS108T        Nichia             1.13E-18      3.020         0.04           2.99                 2.94\nNSPW500BS        Nichia             2.70E-10       6.790         0.03          3.27                 3.20\nNSCW100            Nichia             1.69E-08       9.626         0.03          3.60                 3.50
TEXT 168 256 Left 4 ;+
TEXT 656 56 Left 2 ;3 V battery needs more VBE

Discrete LM3909 - Darl Q1 - 1X Q2 .asc

Version 4
SHEET 1 1816 760
WIRE 64 -16 0 -16
WIRE 112 -16 64 -16
WIRE 272 -16 112 -16
WIRE 544 -16 272 -16
WIRE 1024 -16 544 -16
WIRE 1200 -16 1024 -16
WIRE 112 0 112 -16
WIRE 272 0 272 -16
WIRE 1024 32 1024 -16
WIRE 1200 32 1200 -16
WIRE 0 48 0 -16
WIRE 544 48 544 -16
WIRE 848 80 736 80
WIRE 944 80 848 80
WIRE 960 80 944 80
WIRE 1136 80 1104 80
WIRE 272 96 272 80
WIRE 400 96 272 96
WIRE 480 96 400 96
WIRE 400 112 400 96
WIRE 112 128 112 80
WIRE 272 128 272 96
WIRE 672 128 640 128
WIRE 848 144 848 80
WIRE 944 144 944 80
WIRE 1024 144 1024 128
WIRE 1024 144 944 144
WIRE 1104 144 1104 80
WIRE 1104 144 1024 144
WIRE 112 160 112 128
WIRE 736 192 736 176
WIRE 784 192 736 192
WIRE 0 208 0 128
WIRE 400 208 400 192
WIRE 640 208 640 128
WIRE 640 208 400 208
WIRE 400 224 400 208
WIRE 912 240 848 240
WIRE 112 272 112 224
WIRE 128 272 112 272
WIRE 224 272 192 272
WIRE 272 272 272 208
WIRE 272 272 224 272
WIRE 912 272 912 240
WIRE 400 336 400 304
WIRE 544 336 544 144
WIRE 544 336 400 336
WIRE 112 368 112 272
WIRE 912 368 912 352
WIRE 912 368 112 368
WIRE 272 400 272 272
WIRE 112 416 112 368
WIRE 1200 448 1200 128
WIRE 1200 448 336 448
WIRE 112 464 112 416
WIRE 400 480 400 336
WIRE 0 496 0 288
WIRE 0 496 -32 496
WIRE -32 528 -32 496
WIRE 0 576 0 496
WIRE 64 576 0 576
WIRE 112 576 112 544
WIRE 112 576 64 576
WIRE 272 576 272 496
WIRE 272 576 112 576
WIRE 400 576 400 560
WIRE 400 576 272 576
FLAG -32 528 0
FLAG 112 128 P6-RLIM
FLAG 112 416 P18-RC
FLAG 224 272 P2-OUT
FLAG 64 -16 P5-V+
FLAG 64 576 P4-V-
SYMBOL res 96 -16 R0
SYMATTR InstName R1
SYMATTR Value 39
SYMBOL LED 96 160 R0
SYMATTR InstName D1
SYMATTR Value NSSW008CT-P1
SYMBOL res 96 448 R0
SYMATTR InstName R2
SYMATTR Value 9.1k
SYMBOL cap 192 256 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
WINDOW 40 52 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 470�
SYMATTR SpiceLine2 ic=0.5
SYMBOL res 256 112 R0
SYMATTR InstName R5
SYMATTR Value 390
SYMBOL res 256 -16 R0
SYMATTR InstName R4
SYMATTR Value 390
SYMBOL npn 336 400 M0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL res 384 96 R0
SYMATTR InstName R6
SYMATTR Value 20k
SYMBOL res 384 208 R0
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL res 384 464 R0
SYMATTR InstName R8
SYMATTR Value 20k
SYMBOL npn 480 48 R0
SYMATTR InstName Q4
SYMATTR Value 2N3904
SYMBOL npn 672 80 R0
SYMATTR InstName Q1a
SYMATTR Value 2N3904
SYMBOL pnp 960 128 M180
SYMATTR InstName Q2a
SYMATTR Value 2N3906
SYMBOL voltage 0 192 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 116 Left 2
SYMATTR InstName V1
SYMATTR Value 1.5
SYMBOL res 896 256 R0
SYMATTR InstName R9
SYMATTR Value 100
SYMBOL pnp 1136 128 M180
SYMATTR InstName Q2b
SYMATTR Value 2N3906
SYMBOL npn 784 144 R0
SYMATTR InstName Q1b
SYMATTR Value 2N3904
SYMBOL res -16 32 R0
SYMATTR InstName PTC
SYMATTR Value 5
TEXT -56 192 VRight 2 ;AA Alkaline
TEXT 512 528 Left 2 !.tran 30
TEXT 504 496 Left 2 ;Pins 3 and 7 = no connect
TEXT 760 488 Left 2 ;Sorted by Vd at If=20 mA                                                                                        \n                                                                                                \nPart #                   Mfg             Is (A)              N               Iave (A)     Vf@Iave (V)    Vd@If (V)\nQTLP690C            Fairchild       1.00E-22        1.500         0.16           1.90                 1.82\nPT-121-B              Luminous     4.35E-07       8.370        20.00           3.84                 2.34\nLUW-W5AP          OSRAM           6.57E-08       7.267         2.00           3.26                 2.39\nLXHL-BW02         Lumileds       4.50E-20       2.600         0.40           2.95                 2.75\nW5AP-LZMZ-5K  Lumileds       3.50E-17       3.120          2.00           3.13                 2.76\nLXK2-PW14          Lumileds       3.50E-17       3.120        1.60           3.11                 2.76\nAOT-2015            AOT                  5.96E-10       6.222         0.18          3.16                 2.80\nNSSW008CT-P    Nichia             2.30E-16       3.430        0.04           2.92                 2.86\nNSSWS108T        Nichia             1.13E-18      3.020         0.04           2.99                 2.94\nNSPW500BS        Nichia             2.70E-10       6.790         0.03          3.27                 3.20\nNSCW100            Nichia             1.69E-08       9.626         0.03          3.60                 3.50
TEXT 168 256 Left 4 ;+
TEXT 664 256 Left 2 ;Use MPSA14 Darlington
TEXT 656 56 Left 2 ;3 V battery needs more VBE

Discrete LM3909 - Darl Q1 - 3X Q2 .asc

Version 4
SHEET 1 1816 760
WIRE 64 -16 0 -16
WIRE 112 -16 64 -16
WIRE 272 -16 112 -16
WIRE 544 -16 272 -16
WIRE 1024 -16 544 -16
WIRE 1200 -16 1024 -16
WIRE 1360 -16 1200 -16
WIRE 1520 -16 1360 -16
WIRE 112 0 112 -16
WIRE 272 0 272 -16
WIRE 1024 32 1024 -16
WIRE 1200 32 1200 -16
WIRE 1360 32 1360 -16
WIRE 1520 32 1520 -16
WIRE 0 48 0 -16
WIRE 544 48 544 -16
WIRE 848 80 736 80
WIRE 944 80 848 80
WIRE 960 80 944 80
WIRE 1136 80 1104 80
WIRE 1296 80 1280 80
WIRE 1456 80 1440 80
WIRE 272 96 272 80
WIRE 400 96 272 96
WIRE 480 96 400 96
WIRE 400 112 400 96
WIRE 112 128 112 80
WIRE 272 128 272 96
WIRE 672 128 640 128
WIRE 848 144 848 80
WIRE 944 144 944 80
WIRE 1024 144 1024 128
WIRE 1024 144 944 144
WIRE 1104 144 1104 80
WIRE 1104 144 1024 144
WIRE 1280 144 1280 80
WIRE 1280 144 1104 144
WIRE 1440 144 1440 80
WIRE 1440 144 1280 144
WIRE 112 160 112 128
WIRE 736 192 736 176
WIRE 784 192 736 192
WIRE 1200 192 1200 128
WIRE 1360 192 1360 128
WIRE 1360 192 1200 192
WIRE 1520 192 1520 128
WIRE 1520 192 1360 192
WIRE 0 208 0 128
WIRE 400 208 400 192
WIRE 640 208 640 128
WIRE 640 208 400 208
WIRE 400 224 400 208
WIRE 912 240 848 240
WIRE 112 272 112 224
WIRE 128 272 112 272
WIRE 224 272 192 272
WIRE 272 272 272 208
WIRE 272 272 224 272
WIRE 912 272 912 240
WIRE 400 336 400 304
WIRE 544 336 544 144
WIRE 544 336 400 336
WIRE 112 368 112 272
WIRE 912 368 912 352
WIRE 912 368 112 368
WIRE 272 400 272 272
WIRE 112 416 112 368
WIRE 1200 448 1200 192
WIRE 1200 448 336 448
WIRE 112 464 112 416
WIRE 400 480 400 336
WIRE 0 496 0 288
WIRE 0 496 -32 496
WIRE -32 528 -32 496
WIRE 0 576 0 496
WIRE 64 576 0 576
WIRE 112 576 112 544
WIRE 112 576 64 576
WIRE 272 576 272 496
WIRE 272 576 112 576
WIRE 400 576 400 560
WIRE 400 576 272 576
FLAG -32 528 0
FLAG 112 128 P6-RLIM
FLAG 112 416 P18-RC
FLAG 224 272 P2-OUT
FLAG 64 -16 P5-V+
FLAG 64 576 P4-V-
SYMBOL res 96 -16 R0
SYMATTR InstName R1
SYMATTR Value 39
SYMBOL LED 96 160 R0
SYMATTR InstName D1
SYMATTR Value NSSW008CT-P1
SYMBOL res 96 448 R0
SYMATTR InstName R2
SYMATTR Value 9.1k
SYMBOL cap 192 256 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
WINDOW 40 52 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 470�
SYMATTR SpiceLine2 ic=0.5
SYMBOL res 256 112 R0
SYMATTR InstName R5
SYMATTR Value 390
SYMBOL res 256 -16 R0
SYMATTR InstName R4
SYMATTR Value 390
SYMBOL npn 336 400 M0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL res 384 96 R0
SYMATTR InstName R6
SYMATTR Value 20k
SYMBOL res 384 208 R0
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL res 384 464 R0
SYMATTR InstName R8
SYMATTR Value 20k
SYMBOL npn 480 48 R0
SYMATTR InstName Q4
SYMATTR Value 2N3904
SYMBOL npn 672 80 R0
SYMATTR InstName Q1a
SYMATTR Value 2N3904
SYMBOL pnp 960 128 M180
SYMATTR InstName Q2a
SYMATTR Value 2N3906
SYMBOL voltage 0 192 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 116 Left 2
SYMATTR InstName V1
SYMATTR Value 1.5
SYMBOL res 896 256 R0
SYMATTR InstName R9
SYMATTR Value 100
SYMBOL pnp 1136 128 M180
SYMATTR InstName Q2b
SYMATTR Value 2N3906
SYMBOL pnp 1296 128 M180
SYMATTR InstName Q2c
SYMATTR Value 2N3906
SYMBOL pnp 1456 128 M180
SYMATTR InstName Q2d
SYMATTR Value 2N3906
SYMBOL npn 784 144 R0
SYMATTR InstName Q1b
SYMATTR Value 2N3904
SYMBOL res -16 32 R0
SYMATTR InstName PTC
SYMATTR Value 5
TEXT -56 192 VRight 2 ;AA Alkaline
TEXT 512 528 Left 2 !.tran 15
TEXT 504 496 Left 2 ;Pins 3 and 7 = no connect
TEXT 760 488 Left 2 ;Sorted by Vd at If=20 mA                                                                                        \n                                                                                                \nPart #                   Mfg             Is (A)              N               Iave (A)     Vf@Iave (V)    Vd@If (V)\nQTLP690C            Fairchild       1.00E-22        1.500         0.16           1.90                 1.82\nPT-121-B              Luminous     4.35E-07       8.370        20.00           3.84                 2.34\nLUW-W5AP          OSRAM           6.57E-08       7.267         2.00           3.26                 2.39\nLXHL-BW02         Lumileds       4.50E-20       2.600         0.40           2.95                 2.75\nW5AP-LZMZ-5K  Lumileds       3.50E-17       3.120          2.00           3.13                 2.76\nLXK2-PW14          Lumileds       3.50E-17       3.120        1.60           3.11                 2.76\nAOT-2015            AOT                  5.96E-10       6.222         0.18          3.16                 2.80\nNSSW008CT-P    Nichia             2.30E-16       3.430        0.04           2.92                 2.86\nNSSWS108T        Nichia             1.13E-18      3.020         0.04           2.99                 2.94\nNSPW500BS        Nichia             2.70E-10       6.790         0.03          3.27                 3.20\nNSCW100            Nichia             1.69E-08       9.626         0.03          3.60                 3.50
TEXT 168 256 Left 4 ;+
TEXT 1224 224 Left 2 ;Current mirror with 3X current gain
TEXT 664 256 Left 2 ;Use MPSA14 Darlington
TEXT 656 56 Left 2 ;3 V battery needs more VBE

Discrete LM3909 - Q1 D2.asc

Version 4
SHEET 1 1816 760
WIRE 64 -16 0 -16
WIRE 112 -16 64 -16
WIRE 272 -16 112 -16
WIRE 544 -16 272 -16
WIRE 1024 -16 544 -16
WIRE 1200 -16 1024 -16
WIRE 112 0 112 -16
WIRE 272 0 272 -16
WIRE 1024 32 1024 -16
WIRE 1200 32 1200 -16
WIRE 0 48 0 -16
WIRE 544 48 544 -16
WIRE 944 80 768 80
WIRE 960 80 944 80
WIRE 1136 80 1104 80
WIRE 272 96 272 80
WIRE 400 96 272 96
WIRE 480 96 400 96
WIRE 400 112 400 96
WIRE 112 128 112 80
WIRE 272 128 272 96
WIRE 704 128 640 128
WIRE 944 144 944 80
WIRE 1024 144 1024 128
WIRE 1024 144 944 144
WIRE 1104 144 1104 80
WIRE 1104 144 1024 144
WIRE 112 160 112 128
WIRE 768 192 768 176
WIRE 800 192 768 192
WIRE 912 192 864 192
WIRE 0 208 0 128
WIRE 400 208 400 192
WIRE 640 208 640 128
WIRE 640 208 400 208
WIRE 400 224 400 208
WIRE 112 272 112 224
WIRE 128 272 112 272
WIRE 224 272 192 272
WIRE 272 272 272 208
WIRE 272 272 224 272
WIRE 912 272 912 192
WIRE 400 336 400 304
WIRE 544 336 544 144
WIRE 544 336 400 336
WIRE 112 368 112 272
WIRE 912 368 912 352
WIRE 912 368 112 368
WIRE 272 400 272 272
WIRE 112 416 112 368
WIRE 1200 448 1200 128
WIRE 1200 448 336 448
WIRE 112 464 112 416
WIRE 400 480 400 336
WIRE 0 496 0 288
WIRE 0 496 -32 496
WIRE -32 528 -32 496
WIRE 0 576 0 496
WIRE 64 576 0 576
WIRE 112 576 112 544
WIRE 112 576 64 576
WIRE 272 576 272 496
WIRE 272 576 112 576
WIRE 400 576 400 560
WIRE 400 576 272 576
FLAG -32 528 0
FLAG 112 128 P6-RLIM
FLAG 112 416 P18-RC
FLAG 224 272 P2-OUT
FLAG 64 -16 P5-V+
FLAG 64 576 P4-V-
SYMBOL res 96 -16 R0
SYMATTR InstName R1
SYMATTR Value 39
SYMBOL LED 96 160 R0
SYMATTR InstName D1
SYMATTR Value LXHL-BW02
SYMBOL res 96 448 R0
SYMATTR InstName R2
SYMATTR Value 9.1k
SYMBOL cap 192 256 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
WINDOW 40 52 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 1m
SYMATTR SpiceLine2 ic=0.5
SYMBOL res 256 112 R0
SYMATTR InstName R5
SYMATTR Value 390
SYMBOL res 256 -16 R0
SYMATTR InstName R4
SYMATTR Value 390
SYMBOL npn 336 400 M0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL res 384 96 R0
SYMATTR InstName R6
SYMATTR Value 20k
SYMBOL res 384 208 R0
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL res 384 464 R0
SYMATTR InstName R8
SYMATTR Value 20k
SYMBOL npn 480 48 R0
SYMATTR InstName Q4
SYMATTR Value 2N3904
SYMBOL npn 704 80 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL pnp 960 128 M180
SYMATTR InstName Q2a
SYMATTR Value 2N3906
SYMBOL voltage 0 192 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 116 Left 2
SYMATTR InstName V1
SYMATTR Value 1.5
SYMBOL res 896 256 R0
SYMATTR InstName R9
SYMATTR Value 100
SYMBOL pnp 1136 128 M180
SYMATTR InstName Q2b
SYMATTR Value 2N3906
SYMBOL res -16 32 R0
SYMATTR InstName PTC
SYMATTR Value 5
SYMBOL diode 800 208 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMATTR Value 1N4148
TEXT -56 192 VRight 2 ;AA Alkaline
TEXT 512 528 Left 2 !.tran 30
TEXT 504 496 Left 2 ;Pins 3 and 7 = no connect
TEXT 760 488 Left 2 ;Sorted by Vd at If=20 mA                                                                                        \n                                                                                                \nPart #                   Mfg             Is (A)              N               Iave (A)     Vf@Iave (V)    Vd@If (V)\nQTLP690C            Fairchild       1.00E-22        1.500         0.16           1.90                 1.82\nPT-121-B              Luminous     4.35E-07       8.370        20.00           3.84                 2.34\nLUW-W5AP          OSRAM           6.57E-08       7.267         2.00           3.26                 2.39\nLXHL-BW02         Lumileds       4.50E-20       2.600         0.40           2.95                 2.75\nW5AP-LZMZ-5K  Lumileds       3.50E-17       3.120          2.00           3.13                 2.76\nLXK2-PW14          Lumileds       3.50E-17       3.120        1.60           3.11                 2.76\nAOT-2015            AOT                  5.96E-10       6.222         0.18          3.16                 2.80\nNSSW008CT-P    Nichia             2.30E-16       3.430        0.04           2.92                 2.86\nNSSWS108T        Nichia             1.13E-18      3.020         0.04           2.99                 2.94\nNSPW500BS        Nichia             2.70E-10       6.790         0.03          3.27                 3.20\nNSCW100            Nichia             1.69E-08       9.626         0.03          3.60                 3.50
TEXT 168 256 Left 4 ;+
TEXT 656 56 Left 2 ;3 V battery needs more VBE

Discrete LM3909.asc

Version 4
SHEET 1 1812 680
WIRE 96 -16 32 -16
WIRE 144 -16 96 -16
WIRE 304 -16 144 -16
WIRE 544 -16 304 -16
WIRE 752 -16 544 -16
WIRE 144 0 144 -16
WIRE 304 0 304 -16
WIRE 752 0 752 -16
WIRE 928 0 752 0
WIRE 752 32 752 0
WIRE 928 32 928 0
WIRE 544 48 544 -16
WIRE 832 80 816 80
WIRE 864 80 832 80
WIRE 304 96 304 80
WIRE 400 96 304 96
WIRE 480 96 400 96
WIRE 400 112 400 96
WIRE 144 128 144 80
WIRE 304 128 304 96
WIRE 752 144 752 128
WIRE 752 144 704 144
WIRE 832 144 832 80
WIRE 832 144 752 144
WIRE 144 160 144 128
WIRE 704 160 704 144
WIRE 32 208 32 -16
WIRE 400 208 400 192
WIRE 640 208 400 208
WIRE 400 224 400 208
WIRE 704 272 704 256
WIRE 144 288 144 224
WIRE 160 288 144 288
WIRE 256 288 224 288
WIRE 304 288 304 208
WIRE 304 288 256 288
WIRE 400 320 400 304
WIRE 544 320 544 144
WIRE 544 320 400 320
WIRE 144 368 144 288
WIRE 704 368 704 352
WIRE 704 368 144 368
WIRE 304 400 304 288
WIRE 144 416 144 368
WIRE 928 448 928 128
WIRE 928 448 368 448
WIRE 144 464 144 416
WIRE 400 480 400 320
WIRE 32 496 32 288
WIRE 32 496 0 496
WIRE 0 528 0 496
WIRE 32 576 32 496
WIRE 96 576 32 576
WIRE 144 576 144 544
WIRE 144 576 96 576
WIRE 304 576 304 496
WIRE 304 576 144 576
WIRE 400 576 400 560
WIRE 400 576 304 576
FLAG 0 528 0
FLAG 144 128 P6-RLIM
FLAG 144 416 P18-RC
FLAG 256 288 P2-OUT
FLAG 96 -16 P5-V+
FLAG 96 576 P4-V-
SYMBOL res 128 -16 R0
SYMATTR InstName R1
SYMATTR Value 12
SYMBOL LED 128 160 R0
SYMATTR InstName D1
SYMATTR Value PT-121-B
SYMBOL res 128 448 R0
SYMATTR InstName R2
SYMATTR Value 9.1k
SYMBOL cap 224 272 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
WINDOW 40 52 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 470�
SYMATTR SpiceLine2 ic=0.5
SYMBOL res 288 112 R0
SYMATTR InstName R5
SYMATTR Value 390
SYMBOL res 288 -16 R0
SYMATTR InstName R4
SYMATTR Value 390
SYMBOL npn 368 400 M0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL res 384 96 R0
SYMATTR InstName R6
SYMATTR Value 20k
SYMBOL res 384 208 R0
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL res 384 464 R0
SYMATTR InstName R8
SYMATTR Value 20k
SYMBOL npn 480 48 R0
SYMATTR InstName Q4
SYMATTR Value 2N3904
SYMBOL npn 640 160 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL pnp 816 128 R180
SYMATTR InstName Q2a
SYMATTR Value 2N3906
SYMBOL voltage 32 192 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 116 Left 2
SYMATTR InstName V1
SYMATTR Value 3
SYMBOL res 688 256 R0
SYMATTR InstName R9
SYMATTR Value 100
SYMBOL pnp 864 128 M180
SYMATTR InstName Q2b
SYMATTR Value 2N3906
TEXT -24 192 VRight 2 ;AA Alkaline
TEXT 512 528 Left 2 !.tran 10
TEXT 504 496 Left 2 ;Pins 3 and 7 = no connect
TEXT 1064 112 Left 2 ;Sorted by Vd at If=20 mA                                                                                        \n                                                                                                \nPart #                   Mfg             Is (A)              N               Iave (A)     Vf@Iave (V)    Vd@If (V)\nQTLP690C            Fairchild       1.00E-22        1.500         0.16           1.90                 1.82\nPT-121-B              Luminous     4.35E-07       8.370        20.00           3.84                 2.34\nLUW-W5AP          OSRAM           6.57E-08       7.267         2.00           3.26                 2.39\nLXHL-BW02         Lumileds       4.50E-20       2.600         0.40           2.95                 2.75\nW5AP-LZMZ-5K  Lumileds       3.50E-17       3.120          2.00           3.13                 2.76\nLXK2-PW14          Lumileds       3.50E-17       3.120        1.60           3.11                 2.76\nAOT-2015            AOT                  5.96E-10       6.222         0.18          3.16                 2.80\nNSSW008CT-P    Nichia             2.30E-16       3.430        0.04           2.92                 2.86\nNSSWS108T        Nichia             1.13E-18      3.020         0.04           2.99                 2.94\nNSPW500BS        Nichia             2.70E-10       6.790         0.03          3.27                 3.20\nNSCW100            Nichia             1.69E-08       9.626         0.03          3.60                 3.50

More details on my blog at https://wp.me/poZKh-9lp