Version 4
SHEET 1 880 680
WIRE 144 -272 32 -272
WIRE 592 -272 144 -272
WIRE 32 -256 32 -272
WIRE 144 -256 144 -272
WIRE 32 -176 32 -192
WIRE 144 -144 144 -176
WIRE 32 -96 32 -112
WIRE 80 -96 32 -96
WIRE 144 -32 144 -48
WIRE 288 -32 144 -32
WIRE 432 -32 288 -32
WIRE 32 -16 32 -96
WIRE 144 -16 144 -32
WIRE 288 -16 288 -32
WIRE 432 32 432 -32
WIRE 592 48 592 -272
WIRE 288 80 288 64
WIRE 368 80 288 80
WIRE 288 96 288 80
WIRE 144 144 144 64
WIRE 144 144 64 144
WIRE 224 144 144 144
WIRE 144 160 144 144
WIRE 64 208 64 144
WIRE 80 208 64 208
WIRE 288 208 288 192
WIRE 32 304 32 64
WIRE 144 304 144 256
WIRE 144 304 32 304
WIRE 288 304 288 288
WIRE 288 304 144 304
WIRE 432 304 432 128
WIRE 432 304 288 304
WIRE 592 304 592 128
WIRE 592 304 432 304
WIRE 432 320 432 304
FLAG 432 320 0
SYMBOL npn 80 160 R0
SYMATTR InstName Q2
SYMATTR Value BC547C
SYMBOL npn 224 96 R0
SYMATTR InstName Q3
SYMATTR Value BC547C
SYMBOL npn 368 32 R0
SYMATTR InstName Q4
SYMATTR Value BC547C
SYMBOL res 272 -32 R0
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL res 128 -32 R0
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL res 272 192 R0
SYMATTR InstName R5
SYMATTR Value 1k
SYMBOL voltage 592 32 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL pnp 80 -48 M180
SYMATTR InstName Q1
SYMATTR Value BC857C
SYMBOL diode 16 -176 R0
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL diode 16 -256 R0
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL res 128 -272 R0
SYMATTR InstName R2
SYMATTR Value 470
SYMBOL res 16 -32 R0
SYMATTR InstName R1
SYMATTR Value 6.8k
TEXT 64 344 Left 2 !.dc V1 0 30  temp -25 85