* SPICE netlist
Q2 N005 N005 N008 0 2N3904
D1 0 N008 BZX84C6V2L
R1 VCC N005 4.7k
R2 VCC PE 0.47
R3 N007 N009 {R_SET}
V1 VCC 0 {VCC}
Q3 DB N005 N006 0 2N3904
R4 N006 0 4.7k
Q4 PC PB PE 0 TIP42C
Q5 N003 DB PB 0 2N3906
Q7 N002 N002 N001 0 2N3906
Q6 N002 N002 DB 0 2N3904
R7 VCC VT 145
R13 VT N001 145
RT VCC VT 300
Q1 0 0 N003 0 TIP42C
S1 N004 NC_01 V_SW 0 LDSW
V2 V_SW 0 PULSE(0 1 50n 1n 1n 300n 20000n 10)
D2 PC PB BAT54SHY
L1 N004 N007 {L_SET}
L3 N009 0 {L_SET/2048}
R12 N014 LEFT {R_SET}
L4 RIGHT N014 {L_SET}
R15 N017 BL {Rb}
R14 N010 TL {Rb}
V5 V_LOGIC 0 3.3
V7 WR 0 PULSE(0 3.3 {TC/2+50n} 1n 1n {TON} {TC} 1000)
V8 RD 0 PULSE(0 3.3 50n 1n 1n {TON} {TC} 1000)
V3 EN 0 3.3
R6 N018 BR {Rb}
R8 N011 TR {Rb}
D7 N021 N019 BAT54
R17 0 N021 100
R18 N023 N019 220
R19 N019 V_LOGIC 220
Q15 N021 N019 V_LOGIC 0 2N3906
Q16 0 RD N023 0 2N3906
Q21 0 EN N023 0 2N3906
D14 N024 BL BAT54
R20 VCC BL 220
R21 N022 N024 110
R27 N024 0 110
Q25 V_LOGIC N021 N022 0 2N3904
Q26 BL N024 0 0 2N3904
D21 TR N020 BAT54
R30 0 TR 100
R31 N025 N020 2k
R32 N020 VCC 110
Q27 TR N020 VCC 0 2N3906
Q30 0 BL N025 0 2N3906
D22 N028 N026 BAT54
R33 0 N028 100
R34 N030 N026 220
R35 N026 V_LOGIC 220
Q31 N028 N026 V_LOGIC 0 2N3906
Q32 0 WR N030 0 2N3906
Q33 0 EN N030 0 2N3906
D23 N031 BR BAT54
R36 VCC BR 220
R37 N029 N031 110
R38 N031 0 110
Q34 V_LOGIC N028 N029 0 2N3904
Q35 BR N031 0 0 2N3904
D24 TL N027 BAT54
R39 0 TL 100
R40 N032 N027 2k
R41 N027 VCC 110
Q36 TL N027 VCC 0 2N3906
Q37 0 BR N032 0 2N3906
C1 VCC PE 10n
D3 N012 LEFT 1N914
D4 LEFT N015 1N914
D5 N013 RIGHT 1N914
D6 RIGHT N016 1N914
D8 0 RIGHT BZX84C27VLY
D9 0 LEFT BZX84C27VLY
Q8 N015 N017 0 0 TIP42C
Q9 N016 N018 0 0 TIP42C
Q10 N012 N010 PC 0 TIP41C
Q11 N013 N011 PC 0 TIP41C
.tran {TC*10} uic
.step temp -25 125 25
;.step param VCC 18 25 1
.param VCC=20
;.step param R_SET 100 350 5
.param beta=3468
;.step param beta 3100 4000 100
;.step param R_SET 15 30 15
.temp 25
;.step param L_SET list 2u 3u 4u
.param L_SET=2u
.param R_SET=25
.param Rb=0.1
.param TON=200n
.param TC=1000n
;.step param Rb 100 5000 100

* LTspice schematic (.asc)
Version 4
SHEET 1 3632 6512
WIRE -1176 -3256 -1352 -3256
WIRE -1016 -3256 -1176 -3256
WIRE -680 -3256 -1016 -3256
WIRE -72 -3256 -680 -3256
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WIRE -680 -3080 -680 -3144
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WIRE -728 -2952 -872 -2952
WIRE -680 -2952 -680 -3000
WIRE -680 -2952 -728 -2952
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WIRE -24 -2888 -248 -2888
WIRE 40 -2792 40 -2840
WIRE -680 -2760 -680 -2808
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WIRE -248 -2728 -440 -2728
WIRE -72 -2728 -248 -2728
WIRE 40 -2728 40 -2792
WIRE 40 -2728 -8 -2728
WIRE 1096 -2728 40 -2728
WIRE -744 -2712 -840 -2712
WIRE -840 -2632 -840 -2712
WIRE -680 -2632 -680 -2664
WIRE -680 -2632 -840 -2632
WIRE -680 -2600 -680 -2632
WIRE -840 -2552 -840 -2632
WIRE -744 -2552 -840 -2552
WIRE -440 -2456 -440 -2728
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WIRE 1656 -152 1432 -152
WIRE 1784 -152 1736 -152
WIRE 696 8 696 -248
WIRE 824 8 824 -104
WIRE 824 8 696 8
WIRE 1096 8 824 8
WIRE 1368 8 1368 -104
WIRE 1368 8 1096 8
WIRE 1496 8 1496 -248
WIRE 1496 8 1368 8
WIRE 1096 88 1096 8
WIRE 1416 1448 856 1448
WIRE 1480 1448 1416 1448
WIRE -232 1560 -424 1560
WIRE -120 1560 -232 1560
WIRE 168 1560 -120 1560
WIRE 472 1560 168 1560
WIRE 696 1560 632 1560
WIRE 760 1560 696 1560
WIRE 984 1560 760 1560
WIRE 1272 1560 984 1560
WIRE -120 1608 -120 1560
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WIRE 760 1624 760 1560
WIRE 168 1704 168 1560
WIRE 1272 1704 1272 1560
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WIRE -120 1752 -120 1688
WIRE 8 1752 -120 1752
WIRE 104 1752 8 1752
WIRE 984 1752 984 1688
WIRE 1112 1752 984 1752
WIRE 1208 1752 1112 1752
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WIRE 760 1816 760 1704
WIRE 856 1816 856 1448
WIRE 856 1816 760 1816
WIRE -120 1832 -120 1752
WIRE 984 1832 984 1752
WIRE 8 1848 8 1752
WIRE 72 1848 8 1848
WIRE 168 1848 168 1800
WIRE 168 1848 136 1848
WIRE 1112 1848 1112 1752
WIRE 1176 1848 1112 1848
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WIRE 1272 1848 1240 1848
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WIRE -120 1928 -248 1928
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WIRE 328 1928 328 1768
WIRE 328 1928 168 1928
WIRE 664 1928 600 1928
WIRE 760 1928 760 1816
WIRE 760 1928 728 1928
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WIRE 600 2024 600 1928
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WIRE 1272 2072 1272 1976
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WIRE -312 2104 -424 2104
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WIRE -248 2216 -360 2216
WIRE -120 2216 -120 2056
WIRE -120 2216 -248 2216
WIRE 40 2216 -120 2216
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WIRE 168 2216 40 2216
WIRE 472 2216 472 2168
WIRE 472 2216 168 2216
WIRE 760 2216 760 2072
WIRE 760 2216 472 2216
WIRE 984 2216 984 2056
WIRE 984 2216 760 2216
WIRE 1272 2216 1272 2152
WIRE 1272 2216 984 2216
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WIRE 1480 2408 1416 2408
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WIRE 760 2520 696 2520
WIRE 984 2520 760 2520
WIRE 1272 2520 984 2520
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WIRE 984 2568 984 2520
WIRE 760 2584 760 2520
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WIRE 168 2808 136 2808
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WIRE 1176 2808 1112 2808
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WIRE 1272 2808 1240 2808
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WIRE -120 2888 -248 2888
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WIRE 328 2888 168 2888
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WIRE 760 2888 760 2776
WIRE 760 2888 728 2888
WIRE -120 2920 -120 2888
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WIRE 760 2936 760 2888
WIRE 1272 2936 1272 2808
WIRE 1416 2936 1272 2936
WIRE 1480 2936 1416 2936
WIRE -408 2968 -440 2968
WIRE -184 2968 -408 2968
WIRE 856 2968 856 2776
WIRE 920 2968 856 2968
WIRE 472 2984 472 2904
WIRE 600 2984 600 2888
WIRE 600 2984 472 2984
WIRE 696 2984 600 2984
WIRE -248 3016 -248 2888
WIRE 168 3032 168 2888
WIRE 1272 3032 1272 2936
WIRE 472 3048 472 2984
WIRE -424 3064 -440 3064
WIRE -312 3064 -424 3064
WIRE -248 3176 -248 3112
WIRE -248 3176 -360 3176
WIRE -120 3176 -120 3016
WIRE -120 3176 -248 3176
WIRE 40 3176 -120 3176
WIRE 168 3176 168 3112
WIRE 168 3176 40 3176
WIRE 472 3176 472 3128
WIRE 472 3176 168 3176
WIRE 760 3176 760 3032
WIRE 760 3176 472 3176
WIRE 984 3176 984 3016
WIRE 984 3176 760 3176
WIRE 1272 3176 1272 3112
WIRE 1272 3176 984 3176
WIRE 40 3256 40 3176
FLAG -1080 -1832 0
FLAG 40 -3000 PE
FLAG 40 -2792 PC
FLAG -728 -2952 VT
FLAG -1176 -3256 VCC
FLAG -440 -2728 PB
FLAG -648 -2408 DB
FLAG 136 -2264 0
FLAG 152 -2456 V_SW
FLAG 1096 88 0
FLAG -1736 -1528 0
FLAG -1736 -1608 V_LOGIC
FLAG -1816 136 WR
FLAG -1816 216 0
FLAG -1816 -376 RD
FLAG -1816 -296 0
FLAG -1816 360 EN
FLAG -1816 440 0
FLAG -408 2008 RD
FLAG -232 1560 V_LOGIC
FLAG -424 2104 EN
FLAG 696 1560 VCC
FLAG 40 2296 0
FLAG 1416 1448 BL
FLAG 1416 1976 TR
FLAG -408 2968 WR
FLAG -232 2520 V_LOGIC
FLAG -424 3064 EN
FLAG 696 2520 VCC
FLAG 40 3256 0
FLAG 1416 2408 BR
FLAG 1416 2936 TL
FLAG 456 -632 TL
FLAG 456 -152 BL
FLAG 1816 -632 TR
FLAG 1784 -152 BR
FLAG 904 -392 LEFT
FLAG 1288 -392 RIGHT
SYMBOL npn -952 -2232 M0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL zener -1000 -1992 R180
SYMATTR InstName D1
SYMATTR Value BZX84C6V2L
SYMBOL res -1032 -2424 R0
SYMATTR InstName R1
SYMATTR Value 4.7k
SYMBOL res 24 -3224 R0
SYMATTR InstName R2
SYMATTR Value 0.47
SYMBOL res 24 -2136 R0
SYMATTR InstName R3
SYMATTR Value {R_SET}
SYMBOL voltage -1352 -2392 R0
SYMATTR InstName V1
SYMATTR Value {VCC}
SYMBOL npn -744 -2232 R0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL res -696 -2136 R0
SYMATTR InstName R4
SYMATTR Value 4.7k
SYMBOL pnp -24 -2840 M180
SYMATTR InstName Q4
SYMATTR Value TIP42C
SYMBOL pnp -504 -2360 M180
SYMATTR InstName Q5
SYMATTR Value 2N3906
SYMBOL pnp -744 -2664 M180
SYMATTR InstName Q7
SYMATTR Value 2N3906
SYMBOL npn -744 -2600 R0
SYMATTR InstName Q6
SYMATTR Value 2N3904
SYMBOL res -696 -3096 R0
SYMATTR InstName R7
SYMATTR Value 145
SYMBOL res -696 -2904 R0
SYMATTR InstName R13
SYMATTR Value 145
SYMBOL res -888 -3096 R0
SYMATTR Value 300
SYMATTR InstName RT
SYMBOL pnp -376 -2232 R180
SYMATTR InstName Q1
SYMATTR Value TIP42C
SYMBOL sw 40 -2328 R180
SYMATTR InstName S1
SYMATTR Value LDSW
SYMBOL voltage 264 -2440 R0
SYMATTR Value PULSE(0 1 50n 1n 1n 300n 20000n 10)
SYMATTR InstName V2
SYMBOL schottky -8 -2744 R90
SYMATTR InstName D2
SYMATTR Value BAT54SHY
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL ind 24 -2296 R0
SYMATTR InstName L1
SYMATTR Value {L_SET}
SYMBOL ind 24 -1976 R0
SYMATTR InstName L3
SYMATTR Value {L_SET/2048}
SYMBOL res 1080 -408 R90
SYMATTR InstName R12
SYMATTR Value {R_SET}
SYMBOL ind 1240 -408 R90
SYMATTR InstName L4
SYMATTR Value {L_SET}
SYMBOL res 648 -168 R90
SYMATTR InstName R15
SYMATTR Value {Rb}
SYMBOL res 648 -648 R90
SYMATTR InstName R14
SYMATTR Value {Rb}
SYMBOL voltage -1736 -1624 R0
SYMATTR InstName V5
SYMATTR Value 3.3
SYMBOL voltage -1816 120 R0
SYMATTR Value PULSE(0 3.3 {TC/2+50n} 1n 1n {TON} {TC} 1000)
SYMATTR InstName V7
SYMBOL voltage -1816 -392 R0
SYMATTR Value PULSE(0 3.3 50n 1n 1n {TON} {TC} 1000)
SYMATTR InstName V8
SYMBOL voltage -1816 344 R0
SYMATTR Value 3.3
SYMATTR InstName V3
SYMBOL res 1640 -168 M90
SYMATTR InstName R6
SYMATTR Value {Rb}
SYMBOL res 1624 -648 M90
SYMATTR InstName R8
SYMATTR Value {Rb}
SYMBOL schottky 136 1864 M270
SYMATTR InstName D7
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 152 2168 M180
SYMATTR InstName R17
SYMATTR Value 100
SYMBOL res -136 1928 M180
SYMATTR InstName R18
SYMATTR Value 220
SYMBOL res -136 1704 M180
SYMATTR InstName R19
SYMATTR Value 220
SYMBOL pnp 104 1800 M180
SYMATTR InstName Q15
SYMATTR Value 2N3906
SYMBOL pnp -184 2056 M180
SYMATTR InstName Q16
SYMATTR Value 2N3906
SYMBOL pnp -312 2152 M180
SYMATTR InstName Q21
SYMATTR Value 2N3906
SYMBOL schottky 664 1912 M90
SYMATTR InstName D14
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 744 1608 R0
SYMATTR InstName R20
SYMATTR Value 220
SYMBOL res 456 1848 R0
SYMATTR InstName R21
SYMATTR Value 110
SYMBOL res 456 2072 R0
SYMATTR InstName R27
SYMATTR Value 110
SYMBOL npn 408 1720 R0
SYMATTR InstName Q25
SYMATTR Value 2N3904
SYMBOL npn 696 1976 R0
SYMATTR InstName Q26
SYMATTR Value 2N3904
SYMBOL schottky 1240 1864 M270
SYMATTR InstName D21
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 1256 2168 M180
SYMATTR InstName R30
SYMATTR Value 100
SYMBOL res 968 1928 M180
SYMATTR InstName R31
SYMATTR Value 2k
SYMBOL res 968 1704 M180
SYMATTR InstName R32
SYMATTR Value 110
SYMBOL pnp 1208 1800 M180
SYMATTR InstName Q27
SYMATTR Value 2N3906
SYMBOL pnp 920 2056 M180
SYMATTR InstName Q30
SYMATTR Value 2N3906
SYMBOL schottky 136 2824 M270
SYMATTR InstName D22
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 152 3128 M180
SYMATTR InstName R33
SYMATTR Value 100
SYMBOL res -136 2888 M180
SYMATTR InstName R34
SYMATTR Value 220
SYMBOL res -136 2664 M180
SYMATTR InstName R35
SYMATTR Value 220
SYMBOL pnp 104 2760 M180
SYMATTR InstName Q31
SYMATTR Value 2N3906
SYMBOL pnp -184 3016 M180
SYMATTR InstName Q32
SYMATTR Value 2N3906
SYMBOL pnp -312 3112 M180
SYMATTR InstName Q33
SYMATTR Value 2N3906
SYMBOL schottky 664 2872 M90
SYMATTR InstName D23
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 744 2568 R0
SYMATTR InstName R36
SYMATTR Value 220
SYMBOL res 456 2808 R0
SYMATTR InstName R37
SYMATTR Value 110
SYMBOL res 456 3032 R0
SYMATTR InstName R38
SYMATTR Value 110
SYMBOL npn 408 2680 R0
SYMATTR InstName Q34
SYMATTR Value 2N3904
SYMBOL npn 696 2936 R0
SYMATTR InstName Q35
SYMATTR Value 2N3904
SYMBOL schottky 1240 2824 M270
SYMATTR InstName D24
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 1256 3128 M180
SYMATTR InstName R39
SYMATTR Value 100
SYMBOL res 968 2888 M180
SYMATTR InstName R40
SYMATTR Value 2k
SYMBOL res 968 2664 M180
SYMATTR InstName R41
SYMATTR Value 110
SYMBOL pnp 1208 2760 M180
SYMATTR InstName Q36
SYMATTR Value 2N3906
SYMBOL pnp 920 3016 M180
SYMATTR InstName Q37
SYMATTR Value 2N3906
SYMBOL cap -88 -3160 R0
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL diode 808 -520 R0
SYMATTR InstName D3
SYMATTR Value 1N914
SYMBOL diode 808 -344 R0
SYMATTR InstName D4
SYMATTR Value 1N914
SYMBOL diode 1352 -504 R0
SYMATTR InstName D5
SYMATTR Value 1N914
SYMBOL diode 1352 -344 R0
SYMATTR InstName D6
SYMATTR Value 1N914
SYMBOL diode 1512 -248 R180
SYMATTR InstName D8
SYMATTR Value BZX84C27VLY
SYMBOL diode 712 -248 R180
SYMATTR InstName D9
SYMATTR Value BZX84C27VLY
SYMBOL pnp 760 -200 R0
SYMATTR InstName Q8
SYMATTR Value TIP42C
SYMBOL pnp 1432 -200 M0
SYMATTR InstName Q9
SYMATTR Value TIP42C
SYMBOL npn 760 -584 M180
SYMATTR InstName Q10
SYMATTR Value TIP41C
SYMBOL npn 1432 -584 R180
SYMATTR InstName Q11
SYMATTR Value TIP41C