Version 4
SHEET 1 1136 724
WIRE -80 -384 -80 -416
WIRE 48 -384 48 -416
WIRE 400 -384 400 -400
WIRE 400 -288 400 -320
WIRE -800 -272 -800 -304
WIRE -80 -272 -80 -304
WIRE 48 -272 48 -304
WIRE -336 -192 -336 -224
WIRE 400 -192 400 -224
WIRE -800 -160 -800 -192
WIRE -672 -160 -800 -160
WIRE -544 -144 -608 -144
WIRE -512 -144 -544 -144
WIRE -400 -144 -432 -144
WIRE -800 -128 -800 -160
WIRE -672 -128 -688 -128
WIRE 400 -96 400 -128
WIRE -336 -48 -336 -96
WIRE 128 -48 -80 -48
WIRE -800 -16 -800 -48
WIRE 400 -16 400 -32
WIRE 128 16 128 -48
WIRE 160 16 128 16
WIRE 336 32 224 32
WIRE 32 48 0 48
WIRE 128 48 112 48
WIRE 160 48 128 48
WIRE -336 64 -336 32
WIRE 128 128 128 48
WIRE -336 160 -336 144
WIRE 400 240 400 80
WIRE 400 240 64 240
WIRE -336 256 -336 224
WIRE -80 256 -80 -48
WIRE 0 256 -80 256
WIRE 96 272 64 272
WIRE 400 272 400 240
WIRE -544 304 -544 -144
WIRE -512 304 -544 304
WIRE -400 304 -432 304
WIRE -80 352 -80 256
WIRE -32 352 -80 352
WIRE 96 352 96 272
WIRE 96 352 48 352
WIRE 128 352 96 352
WIRE 256 352 208 352
WIRE -336 384 -336 352
WIRE 256 384 256 352
WIRE 400 384 400 352
FLAG -80 -272 0
FLAG -80 -416 V+
FLAG 192 0 V+
FLAG 192 64 0
FLAG 48 -416 VSIG
FLAG 48 -272 0
FLAG 400 -400 V+
FLAG 400 384 0
FLAG 0 48 VSIG
FLAG 256 384 0
FLAG 32 288 V+
FLAG 32 224 0
FLAG 128 128 VSAFE
FLAG -800 -304 V+
FLAG -800 -16 0
FLAG -688 -128 VSIG
FLAG -640 -176 V+
FLAG -640 -112 0
FLAG -336 32 V+
FLAG -336 384 0
FLAG -336 -48 0
FLAG -336 -224 VSAFE
SYMBOL Opamps\\opamp2 192 -32 R0
SYMATTR InstName U1
SYMATTR Value LM324
SYMBOL voltage -80 -400 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 18V
SYMBOL npn 336 -16 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL voltage 48 -400 R0
WINDOW 3 24 44 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 24 44 Left 2
SYMATTR Value ""
SYMATTR InstName V2
SYMBOL LED 384 -96 R0
SYMATTR InstName D1
SYMATTR Value LXHL-BW02
SYMBOL res 384 256 R0
SYMATTR InstName R1
SYMATTR Value 10R
SYMBOL LED 384 -192 R0
SYMATTR InstName D2
SYMATTR Value LXHL-BW02
SYMBOL LED 384 -288 R0
SYMATTR InstName D3
SYMATTR Value LXHL-BW02
SYMBOL LED 384 -384 R0
SYMATTR InstName D4
SYMATTR Value LXHL-BW02
SYMBOL res 64 336 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 180k
SYMBOL res 224 336 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 20k
SYMBOL res 128 32 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL Opamps\\opamp2 -640 -208 R0
SYMATTR InstName U2
SYMATTR Value LM324
SYMBOL res -816 -288 R0
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL res -816 -144 R0
SYMATTR InstName R6
SYMATTR Value 2k
SYMBOL npn -400 -192 R0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL res -416 -160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL npn -400 256 R0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL res -416 288 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 10k
SYMBOL LED -352 160 R0
SYMATTR InstName D5
SYMATTR Value LXHL-BW02
SYMBOL res -352 48 R0
SYMATTR InstName R9
SYMATTR Value 1.8k
SYMBOL Opamps\\opamp2 32 320 R180
SYMATTR InstName U3
SYMATTR Value LM324
TEXT -88 -144 Left 2 !.include LM324.txt
TEXT -88 -96 Left 2 !.dc V2 0V 4V