Version 4
SHEET 1 880 680
WIRE 224 16 144 16
WIRE 224 48 224 16
WIRE 144 144 144 16
WIRE 224 144 224 128
WIRE -160 240 -352 240
WIRE 96 240 -160 240
WIRE 416 240 240 240
WIRE -352 256 -352 240
WIRE 416 272 416 240
WIRE -352 368 -352 336
WIRE 144 368 144 336
WIRE 416 368 416 352
FLAG 144 368 0
FLAG 224 144 0
FLAG 224 16 +9V
FLAG 416 368 0
FLAG -352 368 0
FLAG -160 240 sig1_in
FLAG 416 240 sig1_out
SYMBOL Misc\\battery 224 32 R0
SYMATTR InstName V1
SYMATTR Value 9V
SYMBOL res 400 256 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL voltage -352 240 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value PULSE(0 0.01 0 100u 100u 400u 1m)
SYMBOL preamp 144 240 R0
SYMATTR InstName X1
TEXT -360 40 Left 2 !.tran 10m
TEXT -360 72 Left 2 ;.options plotwinsize=0
TEXT -360 104 Left 2 ;.ac dec 100 1 100k
TEXT -368 -112 Left 2 ;Move the cursor over the symbol.\nThen use Ctrl-RightMouseButton to add or\nchange  parameters for the lower level circuit.