Version 4
SHEET 1 1556 888
WIRE 352 336 352 320
WIRE 400 208 400 160
WIRE 400 320 352 320
WIRE 400 320 400 288
WIRE 400 368 400 320
WIRE 400 480 400 448
WIRE 560 320 560 272
WIRE 560 432 560 400
WIRE 688 352 688 304
WIRE 752 272 560 272
WIRE 752 304 688 304
WIRE 784 160 400 160
WIRE 784 256 784 160
WIRE 784 480 400 480
WIRE 784 480 784 320
WIRE 816 480 784 480
WIRE 816 480 816 304
WIRE 912 160 784 160
WIRE 912 192 912 160
WIRE 912 288 816 288
WIRE 912 288 912 272
WIRE 976 288 912 288
FLAG 688 352 0
FLAG 352 336 0
FLAG 560 432 0
FLAG 976 288 OUT
SYMBOL voltage 400 192 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL voltage 400 352 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL res 896 176 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL voltage 560 304 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value SINE(0 1 100)
SYMBOL LM311X 784 224 R0
SYMATTR InstName X1
TEXT 876 374 Left 0 !.tran .1