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Here's the circuit list again, just in case...
Version 4
SHEET 1 880 680
WIRE 16 -192 -496 -192
WIRE 160 -192 16 -192
WIRE 16 -144 16 -192
WIRE 160 -144 160 -192
WIRE 16 0 16 -64
WIRE 160 48 160 -64
WIRE 160 48 80 48
WIRE 160 80 160 48
WIRE 160 176 160 144
WIRE -352 224 -400 224
WIRE -208 224 -272 224
WIRE -128 224 -208 224
WIRE 16 224 16 96
WIRE 16 224 -64 224
WIRE 96 224 16 224
WIRE -496 256 -496 -192
WIRE -400 256 -400 224
WIRE -208 272 -208 224
WIRE 160 320 160 272
WIRE -496 432 -496 336
WIRE -400 432 -400 336
WIRE -400 432 -496 432
WIRE -208 432 -208 336
WIRE -208 432 -400 432
WIRE 160 432 160 400
WIRE 160 432 -208 432
WIRE -496 496 -496 432
FLAG -496 496 0
SYMBOL res 144 -160 R0
SYMATTR InstName R1
SYMATTR Value 330
SYMATTR SpiceLine ""
SYMBOL npn 96 176 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL pnp 80 96 R180
SYMATTR InstName Q2
SYMATTR Value 2N3906
SYMBOL diode -128 240 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL res -256 208 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 68k
SYMATTR SpiceLine ""
SYMBOL cap -224 272 R0
SYMATTR InstName C1
SYMATTR Value 47
SYMATTR SpiceLine ""
SYMBOL LED 144 80 R0
SYMATTR InstName D2
SYMATTR Value NSCW100
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL voltage -400 240 R0
WINDOW 3 24 96 Invisible 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value PULSE(0 5 1 1u 1u 1 0 1)
SYMATTR Value2 ""
SYMATTR SpiceLine ""
SYMATTR InstName V1
SYMBOL voltage -496 240 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value2 ""
SYMATTR SpiceLine ""
SYMATTR InstName V2
SYMATTR Value 10
SYMBOL res 0 -160 R0
SYMATTR InstName R4
SYMATTR Value 1000
SYMATTR SpiceLine ""
SYMBOL res 144 304 R0
SYMATTR InstName R3
SYMATTR Value 39
SYMATTR SpiceLine ""
TEXT -488 456 Left 2 !.tran 3
Now, here's what to do:
1. On your newsreader's screen, copy the entire list, including
"Version 4", to the clipboard by selecting all the text, then
pressing CTRL-C.
2. Launch Word Pad or any other plain ASCII text editor, and paste the
circuit list into it by pressing Ctrl-V.
3. Using "Save As", assign a filename to the list
(say, "1s pulse detect.asc") and save it to any folder you like.
Make _sure_ the file has a .asc filename extension.
4. Now, navigate over to the folder to where you saved
"1s pulse detect.asc", and left click on the file.
If .asc files are associated with LTspice in your box, then LTspice
will find it and you'll see the schematic pop up.
If that doesn't happen, launch LTspice, navigate to the file, and
left-click on it.
The schematic should appear, and then you can play with the circuit
'til your heart's content.
5. Enjoy!