Version 4
SHEET 1 3220 680
WIRE 1072 -336 624 -336
WIRE 1136 -336 1072 -336
WIRE 1200 -336 1136 -336
WIRE 1264 -336 1200 -336
WIRE 624 -240 624 -336
WIRE 1072 -208 1072 -336
WIRE 1136 -208 1136 -336
WIRE 1200 -208 1200 -336
WIRE 1264 -208 1264 -336
WIRE 1264 -16 1264 -128
WIRE 1200 48 1200 -128
WIRE 1264 48 1200 48
WIRE 96 96 96 80
WIRE 96 96 -32 96
WIRE -32 112 -32 96
WIRE 1136 112 1136 -128
WIRE 1200 112 1136 112
WIRE 96 128 96 96
WIRE 1072 176 1072 -128
WIRE 1136 176 1072 176
WIRE 1072 320 1072 240
FLAG -32 112 0
FLAG 96 208 Vee
FLAG 96 0 Vcc
FLAG 1904 -400 Vcc
FLAG 1904 -160 0
FLAG 624 -160 0
FLAG 1072 320 0
FLAG 2144 -320 Vcc
FLAG 2144 -80 0
FLAG 2368 -240 Vcc
FLAG 2368 0 0
FLAG 2608 -160 Vcc
FLAG 2608 80 0
FLAG 2848 -80 Vcc
FLAG 2848 160 0
FLAG 3088 0 Vcc
FLAG 3088 240 0
SYMBOL voltage 96 -16 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL voltage 96 112 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL npn 1840 -256 R0
SYMATTR InstName Q1
SYMATTR Value BC547B
SYMBOL LED 1888 -320 R0
SYMATTR InstName D1
SYMATTR Value NSCW100
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 1888 -416 R0
SYMATTR InstName R1
SYMATTR Value {Rdiode}
SYMBOL voltage 624 -256 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value PULSE(0 10 0 1 1 0)
SYMBOL res 1744 -192 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R9
SYMATTR Value {Rbase}
SYMBOL npn 2080 -176 R0
SYMATTR InstName Q2
SYMATTR Value BC547B
SYMBOL LED 2128 -240 R0
SYMATTR InstName D2
SYMATTR Value NSCW100
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 2128 -336 R0
SYMATTR InstName R10
SYMATTR Value {Rdiode}
SYMBOL res 1984 -112 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R11
SYMATTR Value {Rbase}
SYMBOL npn 2304 -96 R0
SYMATTR InstName Q3
SYMATTR Value BC547B
SYMBOL LED 2352 -160 R0
SYMATTR InstName D3
SYMATTR Value NSCW100
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 2352 -256 R0
SYMATTR InstName R12
SYMATTR Value {Rdiode}
SYMBOL res 2208 -32 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R13
SYMATTR Value {Rbase}
SYMBOL npn 2544 -16 R0
SYMATTR InstName Q4
SYMATTR Value BC547B
SYMBOL LED 2592 -80 R0
SYMATTR InstName D4
SYMATTR Value NSCW100
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 2592 -176 R0
SYMATTR InstName R14
SYMATTR Value {Rdiode}
SYMBOL res 2448 48 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R15
SYMATTR Value {Rbase}
SYMBOL npn 2784 64 R0
SYMATTR InstName Q5
SYMATTR Value BC547B
SYMBOL LED 2832 0 R0
SYMATTR InstName D5
SYMATTR Value NSCW100
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 2832 -96 R0
SYMATTR InstName R16
SYMATTR Value {Rdiode}
SYMBOL res 2688 128 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R17
SYMATTR Value {Rbase}
SYMBOL npn 3024 144 R0
SYMATTR InstName Q6
SYMATTR Value BC547B
SYMBOL LED 3072 80 R0
SYMATTR InstName D6
SYMATTR Value NSCW100
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 3072 -16 R0
SYMATTR InstName R18
SYMATTR Value {Rdiode}
SYMBOL res 2928 208 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R19
SYMATTR Value {Rbase}
SYMBOL diode 1056 176 R0
SYMATTR InstName D7
SYMATTR Value 1N4148
SYMBOL diode 1120 112 R0
SYMATTR InstName D8
SYMATTR Value 1N4148
SYMBOL diode 1184 48 R0
SYMATTR InstName D9
SYMATTR Value 1N4148
SYMBOL diode 1248 -16 R0
SYMATTR InstName D10
SYMATTR Value 1N4148
SYMBOL res 1056 -224 R0
SYMATTR InstName R2
SYMATTR Value {Rladder}
SYMBOL res 1120 -224 R0
SYMATTR InstName R3
SYMATTR Value {Rladder}
SYMBOL res 1184 -224 R0
SYMATTR InstName R4
SYMATTR Value {Rladder}
SYMBOL res 1248 -224 R0
SYMATTR InstName R5
SYMATTR Value {Rladder}
TEXT 88 -376 Left 2 !.param Rladder=100
TEXT 88 -328 Left 2 !.param Rdiode=100
TEXT -52 330 Left 2 !.tran 1
TEXT 88 -280 Left 2 !.param Rbase=10k