* SPICE netlist
Q1 N002 2 N007 0 BC546B
Q2 N003 7 3 0 BC546B
R1 3 N007 18k
R2 6 N002 1k5
R3 N003 6 100
Dz6 1 N007 BZX84C6V2L
R4 1 2 2k
R5 3 2 10k
Q4 N006 N005 5 0 BC556B
Q3 3 6 5 0 BC556B
R6 5 6 470
R7 N001 5 18
D1 N006 3 1N914
R8 N005 4 100
C1 4 5 10n
R9 9 7 270
M1 N004 N001 N008 N008 STP8NM60
D3 9 11 BYW96E
R10 9 8 1m
D2 3 5 BZX84C15L
Dr 4 5 1N914
R11 N008 9 3
R12 N004 12 3

* LTspice schematic (.asc)
Version 4
SHEET 1 1120 336
WIRE -64 -152 -320 -152
WIRE -32 -152 -64 -152
WIRE 96 -152 48 -152
WIRE 144 -152 96 -152
WIRE 256 -152 144 -152
WIRE 288 -152 256 -152
WIRE 400 -152 368 -152
WIRE 96 -136 96 -152
WIRE 256 -136 256 -152
WIRE -432 -120 -448 -120
WIRE -320 -120 -320 -152
WIRE -320 -120 -352 -120
WIRE -288 -120 -320 -120
WIRE -192 -120 -208 -120
WIRE 560 -104 464 -104
WIRE -64 -88 -64 -152
WIRE 32 -88 -64 -88
WIRE 368 -88 320 -88
WIRE 464 -88 464 -104
WIRE -512 -72 -560 -72
WIRE -96 -72 -128 -72
WIRE 112 -40 96 -40
WIRE 160 -40 112 -40
WIRE 256 -40 224 -40
WIRE -416 -24 -448 -24
WIRE -368 -24 -416 -24
WIRE -240 -24 -288 -24
WIRE -192 -24 -240 -24
WIRE -64 -8 -64 -88
WIRE -64 -8 -176 -8
WIRE 400 -8 400 -152
WIRE 416 -8 400 -8
WIRE 560 -8 560 -104
WIRE -560 8 -560 -72
WIRE -528 8 -560 8
WIRE -240 8 -240 -24
WIRE -240 8 -448 8
WIRE 112 8 112 -40
WIRE 112 8 -240 8
WIRE -416 24 -416 -24
WIRE 144 24 144 -152
WIRE 160 24 144 24
WIRE 240 24 224 24
WIRE 256 24 240 24
WIRE 368 24 368 -88
WIRE 368 24 336 24
WIRE -96 56 -96 -72
WIRE -16 56 -96 56
WIRE 288 56 64 56
WIRE 336 56 288 56
WIRE 352 56 336 56
WIRE 464 56 464 8
WIRE 464 56 432 56
WIRE 112 72 112 8
WIRE 288 72 288 56
WIRE -560 120 -560 8
WIRE -528 120 -560 120
WIRE -416 120 -416 88
WIRE -416 120 -448 120
WIRE 336 136 336 56
WIRE 384 136 336 136
WIRE 480 136 448 136
WIRE 112 152 112 136
WIRE 144 152 144 24
WIRE 144 152 112 152
WIRE 160 152 144 152
WIRE 240 152 240 24
WIRE 240 152 224 152
WIRE -560 168 -560 120
WIRE -416 168 -416 120
WIRE -240 168 -240 8
WIRE -176 168 -176 -8
WIRE -96 168 -96 56
WIRE 112 168 112 152
WIRE 240 168 240 152
WIRE 288 168 288 152
WIRE 336 168 336 136
WIRE 480 168 480 136
WIRE 512 168 480 168
WIRE 560 168 560 72
FLAG -560 168 2
FLAG -416 168 1
FLAG -240 168 3
FLAG -96 168 7
FLAG -176 168 6
FLAG 112 168 5
FLAG 240 168 4
FLAG 560 168 12
FLAG 288 168 8
FLAG 336 168 9
FLAG 512 168 11
SYMBOL npn2 -512 -120 R0
SYMATTR InstName Q1
SYMATTR Value BC546B
SYMBOL npn2 -128 -120 M0
SYMATTR InstName Q2
SYMATTR Value BC546B
SYMBOL res -272 -40 R90
SYMATTR InstName R1
SYMATTR Value 18k
SYMBOL res -336 -136 R90
SYMATTR InstName R2
SYMATTR Value 1k5
SYMBOL res -192 -136 R90
SYMATTR InstName R3
SYMATTR Value 100
SYMBOL zener -400 88 R180
SYMATTR InstName Dz6
SYMATTR Value BZX84C6V2L
SYMBOL res -432 104 R90
SYMATTR InstName R4
SYMATTR Value 2k
SYMBOL res -432 -8 R90
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL pnp2 320 -40 R180
SYMATTR InstName Q4
SYMATTR Value BC556B
SYMBOL pnp2 32 -40 M180
SYMATTR InstName Q3
SYMATTR Value BC556B
SYMBOL res 64 -168 R90
SYMATTR InstName R6
SYMATTR Value 470
SYMBOL res 384 -168 R90
SYMATTR InstName R7
SYMATTR Value 18
SYMBOL diode 224 -56 R90
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL res 352 8 R90
SYMATTR InstName R8
SYMATTR Value 100
SYMBOL cap 224 136 R90
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL res 80 40 R90
SYMATTR InstName R9
SYMATTR Value 270
SYMBOL nmos 416 -88 R0
SYMATTR InstName M1
SYMATTR Value STP8NM60
SYMBOL diode 384 152 R270
SYMATTR InstName D3
SYMATTR Value BYW96E
SYMBOL res 272 56 R0
SYMATTR InstName R10
SYMATTR Value 1m
SYMBOL zener 128 72 M0
SYMATTR Value BZX84C15L
SYMATTR InstName D2
SYMBOL diode 224 40 M270
SYMATTR InstName Dr
SYMATTR Value 1N914
SYMATTR Description Zener Diode
SYMATTR Type zener
SYMBOL res 448 40 R90
SYMATTR InstName R11
SYMATTR Value 3
SYMBOL res 544 -24 R0
SYMATTR InstName R12
SYMATTR Value 3