Version 4
SHEET 1 1060 680
WIRE -240 -576 -432 -576
WIRE 432 -576 -240 -576
WIRE 624 -576 432 -576
WIRE 752 -576 624 -576
WIRE 800 -576 752 -576
WIRE -432 -544 -432 -576
WIRE -240 -544 -240 -576
WIRE 432 -544 432 -576
WIRE -432 -432 -432 -464
WIRE -240 -432 -240 -464
WIRE 432 -416 432 -464
WIRE 528 -416 432 -416
WIRE -336 -384 -368 -384
WIRE -304 -384 -336 -384
WIRE 432 -384 432 -416
WIRE 624 -384 624 -576
WIRE 320 -336 -240 -336
WIRE 528 -336 528 -416
WIRE 528 -336 496 -336
WIRE 560 -336 528 -336
WIRE 752 -320 752 -576
WIRE -432 -304 -432 -336
WIRE -432 -304 -528 -304
WIRE -336 -304 -336 -384
WIRE -336 -304 -432 -304
WIRE 432 -288 384 -288
WIRE -432 -272 -432 -304
WIRE -240 -224 -240 -336
WIRE -240 -224 -368 -224
WIRE -128 -224 -240 -224
WIRE -16 -224 -128 -224
WIRE 96 -224 -16 -224
WIRE 208 -224 96 -224
WIRE 432 -224 432 -288
WIRE -64 -176 -176 -176
WIRE 48 -176 -64 -176
WIRE 160 -176 48 -176
WIRE 272 -176 160 -176
WIRE 320 -176 320 -240
WIRE 320 -176 272 -176
WIRE 368 -176 320 -176
WIRE -128 -128 -240 -128
WIRE -16 -128 -128 -128
WIRE 96 -128 -16 -128
WIRE 208 -128 96 -128
WIRE -240 -96 -240 -128
WIRE 320 -96 320 -176
WIRE 624 -96 624 -288
WIRE -432 16 -432 -176
WIRE -240 16 -240 -16
WIRE -240 16 -432 16
WIRE 320 16 320 -16
WIRE 320 16 -240 16
WIRE 432 16 432 -128
WIRE 432 16 320 16
WIRE 624 16 624 -16
WIRE 624 16 432 16
WIRE 752 16 752 -240
WIRE 752 16 624 16
WIRE 752 32 752 16
FLAG -528 -304 VREF
FLAG 752 32 0
FLAG 800 -576 OUT
SYMBOL npn 272 -224 M0
SYMATTR InstName Q2
SYMATTR Value BC547C
SYMBOL npn 160 -224 M0
SYMATTR InstName Q3
SYMATTR Value BC547C
SYMBOL npn 48 -224 M0
SYMATTR InstName Q4
SYMATTR Value BC547C
SYMBOL npn -64 -224 M0
SYMATTR InstName Q5
SYMATTR Value BC547C
SYMBOL npn -176 -224 M0
SYMATTR InstName Q6
SYMATTR Value BC547C
SYMBOL npn 368 -224 R0
SYMATTR InstName Q7
SYMATTR Value BC547C
SYMBOL npn 384 -336 M0
SYMATTR InstName Q8
SYMATTR Value BC547C
SYMBOL pnp -368 -336 R180
SYMATTR InstName Q11
SYMATTR Value BC557C
SYMBOL pnp -368 -176 R180
SYMATTR InstName Q12
SYMATTR Value BC557C
SYMBOL pnp -304 -336 M180
SYMATTR InstName Q13
SYMATTR Value BC557C
SYMBOL npn 560 -384 R0
SYMATTR InstName Q14
SYMATTR Value BC547C
SYMBOL npn 496 -384 M0
SYMATTR InstName Q15
SYMATTR Value BC547C
SYMBOL res -448 -560 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL res -256 -560 R0
SYMATTR InstName R2
SYMATTR Value 900
SYMBOL res -256 -112 R0
SYMATTR InstName R4
SYMATTR Value 720
SYMBOL res 304 -112 R0
SYMATTR InstName R5
SYMATTR Value 24k
SYMBOL res 608 -112 R0
SYMATTR InstName R6
SYMATTR Value 20k
SYMBOL res 416 -560 R0
SYMATTR InstName R7
SYMATTR Value 1k8
SYMBOL current 752 -240 R180
WINDOW 0 24 88 Left 0
WINDOW 3 24 0 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName I1
SYMATTR Value 1m
TEXT 32 -480 Left 0 !.dc I1 0 1m 1u