* SPICE netlist
Q1 N002 N005 0 0 BC547B
Q3 N003 N006 0 0 BC547B
Q5 N009 N012 N001 0 BC557B
Q2 N010 N011 N001 0 BC557B
R3 N012 N008 1k
R4 N011 N008 1k
R2 N006 N004 1k
R1 N005 N004 1k
V1 N007 0 5
Rpull_up_2 N011 N001 500
Rpull_up_1 N012 N001 500
RQ3_limiter N001 N002 33
RQ4_limiter N001 N003 33
RQ1_limiter 0 N009 33
RQ2_limiter 0 N010 33
V2 N004 0 PULSE(0 3.3 0 0 0 1)
V3 N008 0 PULSE(0 3.3 0 0 0 1 0 1)
RPower_Control_Resistor N007 N001 10 ohm
.tran 10

* LTspice schematic (.asc)
Version 4
SHEET 1 1632 1024
WIRE -160 -512 -336 -512
WIRE 448 -512 -160 -512
WIRE 816 -512 448 -512
WIRE -304 -416 -336 -416
WIRE -160 -416 -160 -512
WIRE -160 -416 -224 -416
WIRE 304 -416 272 -416
WIRE 448 -416 448 -512
WIRE 448 -416 384 -416
WIRE -336 -304 -336 -416
WIRE 272 -304 272 -416
WIRE -592 -288 -656 -288
WIRE 0 -288 -64 -288
WIRE -592 -256 -592 -288
WIRE -544 -256 -592 -256
WIRE -400 -256 -464 -256
WIRE 0 -256 0 -288
WIRE 64 -256 0 -256
WIRE 208 -256 144 -256
WIRE -656 -192 -656 -288
WIRE -496 -192 -656 -192
WIRE -336 -160 -336 -208
WIRE 272 -160 272 -208
WIRE 272 -160 -336 -160
WIRE 576 -160 272 -160
WIRE 656 -160 576 -160
WIRE 656 -128 656 -160
WIRE -496 -112 -496 -192
WIRE -64 -112 -64 -288
WIRE -64 -112 -496 -112
WIRE -496 -64 -496 -112
WIRE 576 -16 576 -160
WIRE -496 80 -496 16
WIRE 576 112 576 64
WIRE -16 144 -640 144
WIRE -304 192 -336 192
WIRE -208 192 -224 192
WIRE 288 192 272 192
WIRE 384 192 368 192
WIRE -208 240 -208 192
WIRE 384 240 384 192
WIRE 576 272 576 192
WIRE 816 272 816 -512
WIRE 816 272 576 272
WIRE -640 288 -640 144
WIRE -640 288 -816 288
WIRE 272 304 272 192
WIRE -336 320 -336 192
WIRE -16 352 -16 144
WIRE 64 352 -16 352
WIRE 160 352 144 352
WIRE 208 352 160 352
WIRE -816 368 -816 288
WIRE -640 368 -640 288
WIRE -544 368 -640 368
WIRE -448 368 -464 368
WIRE -400 368 -448 368
WIRE -448 400 -448 368
WIRE 160 400 160 352
WIRE -816 512 -816 448
WIRE -448 512 -448 480
WIRE -336 512 -336 416
WIRE -336 512 -448 512
WIRE 160 512 160 480
WIRE 160 512 -336 512
WIRE 272 512 272 400
WIRE 272 512 160 512
WIRE 576 512 576 272
WIRE 576 512 272 512
FLAG 656 -128 0
FLAG -208 240 0
FLAG 384 240 0
FLAG -496 80 0
FLAG -816 512 0
SYMBOL npn -400 -304 R0
SYMATTR InstName Q1
SYMATTR Value BC547B
SYMBOL npn 208 -304 R0
SYMATTR InstName Q3
SYMATTR Value BC547B
SYMBOL pnp -400 320 R0
SYMATTR InstName Q5
SYMATTR Value BC557B
SYMBOL pnp 208 304 R0
SYMATTR InstName Q2
SYMATTR Value BC557B
SYMBOL res -448 352 R90
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL res 160 336 R90
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL res 160 -272 R90
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL res -448 -272 R90
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL voltage 576 80 R180
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL res 144 384 R0
SYMATTR InstName pull_up_2
SYMATTR Value 500
SYMBOL res -464 384 R0
SYMATTR InstName pull_up_1
SYMATTR Value 500
SYMBOL res -208 -432 R90
SYMATTR InstName Q3_limiter
SYMATTR Value 33
SYMBOL res 400 -432 R90
SYMATTR InstName Q4_limiter
SYMATTR Value 33
SYMBOL res -208 176 R90
SYMATTR InstName Q1_limiter
SYMATTR Value 33
SYMBOL res 384 176 R90
SYMATTR InstName Q2_limiter
SYMATTR Value 33
SYMBOL voltage -496 -80 R0
SYMATTR InstName V2
SYMATTR Value PULSE(0 3.3 0 0 0 1)
SYMBOL voltage -816 352 R0
SYMATTR InstName V3
SYMATTR Value PULSE(0 3.3 0 0 0 1 0 1)
SYMBOL res 560 96 R0
SYMATTR InstName Power_Control_Resistor
SYMATTR Value 10 ohm