Version 4
SHEET 1 880 680
WIRE -16 -128 -64 -128
WIRE 192 -128 64 -128
WIRE 192 16 192 -128
WIRE 192 16 144 16
WIRE 240 16 192 16
WIRE 0 112 -144 112
WIRE 144 112 144 96
WIRE 144 112 80 112
WIRE 192 112 144 112
WIRE 240 112 240 96
WIRE 240 112 192 112
WIRE -144 160 -144 112
WIRE 192 192 192 112
WIRE -144 272 -144 240
WIRE 192 320 192 272
FLAG 192 320 0
FLAG -64 -128 0
FLAG -144 272 0
SYMBOL res 96 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 50k
SYMBOL res 160 112 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R2
SYMATTR Value 50k
SYMBOL res 256 112 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL res 208 288 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL voltage 80 -128 R90
WINDOW 0 -32 56 VBottom 2
WINDOW 3 32 56 VTop 2
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 3
SYMBOL voltage -144 144 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 18
TEXT -176 344 Left 2 !.tran 1