Version 4
SHEET 1 1444 680
WIRE 304 -32 240 -32
WIRE 624 -32 304 -32
WIRE 1072 -16 912 -16
WIRE 1152 -16 1072 -16
WIRE 496 16 432 16
WIRE 576 16 496 16
WIRE 912 16 912 -16
WIRE 240 32 240 -32
WIRE 384 32 240 32
WIRE 624 32 624 -32
WIRE 240 48 240 32
WIRE 432 48 432 16
WIRE 576 48 576 16
WIRE 384 64 384 32
WIRE 576 96 544 96
WIRE 1152 96 1152 -16
WIRE 624 128 624 112
WIRE 912 128 912 96
WIRE 992 128 912 128
WIRE 1056 128 992 128
WIRE 240 144 240 128
WIRE 384 144 384 112
WIRE 384 144 240 144
WIRE 432 160 432 128
WIRE 912 160 912 128
WIRE 240 176 240 144
WIRE 544 176 544 96
WIRE 912 272 912 240
WIRE 1152 272 1152 176
WIRE 240 288 240 256
WIRE 544 288 544 256
FLAG 240 288 0
FLAG 432 160 0
FLAG 544 288 0
FLAG 624 128 0
FLAG 912 272 0
FLAG 912 -16 1
FLAG 1056 128 2
FLAG 1152 272 0
DATAFLAG 304 -32 ""
DATAFLAG 496 16 ""
DATAFLAG 992 128 ""
DATAFLAG 1072 -16 ""
SYMBOL e 624 16 R0
SYMATTR InstName E1
SYMATTR Value -1000k
SYMBOL res 224 32 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL res 224 160 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL e 432 32 R0
SYMATTR InstName E2
SYMATTR Value 1
SYMBOL voltage 544 160 R0
SYMATTR InstName V1
SYMATTR Value 0.5
SYMBOL res 896 0 R0
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL res 896 144 R0
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL bv 1152 80 R0
SYMATTR InstName B1
SYMATTR Value V=-1000k*(V(1,2)-0.5)
TEXT 240 -144 Left 2 !.op
TEXT 560 -160 Left 4 ;V(R1) = 0.5V
RECTANGLE Normal 752 336 192 -96 2
RECTANGLE Normal 1424 336 864 -96 2