Version 4
SHEET 1 880 680
WIRE 144 64 32 64
WIRE 32 144 32 64
WIRE 144 208 144 144
WIRE 320 208 144 208
WIRE 32 288 32 224
WIRE 144 288 32 288
WIRE 320 288 144 288
WIRE 32 304 32 288
FLAG 32 304 0
SYMBOL res 128 48 R0
SYMATTR InstName R1
SYMATTR Value 1.5k
SYMBOL res 128 192 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL res 304 192 R0
SYMATTR InstName R3
SYMATTR Value {R3var}
SYMBOL voltage 32 128 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 10
TEXT 0 344 Left 2 !.op
TEXT 88 312 Left 2 !.step param R3var 1k 2k 0.1k