Hello,

I've read the FAQ, but still can't get a LM555 subcircuit to run properly.

I've copied the symbol to folder:
C:\Program Files\LTC\LTspiceIV\lib\sym\mylib\LM555.asy


If I copy the subcircuit into the folder:
C:\Program Files\LTC\LTspiceIV\lib\sub\LM555.sub


LTSPICE can find the subcircuit and execute properly.

If I relocate the subcircuit to folder:
C:\Program Files\LTC\LTspiceIV\lib\sub\mylib\LM555.sub

The subcircuit can no longer be found. I've made sure to include the Spice line:

.lib "C:\Program Files\LTC\LTspiceIV\lib\sub\mylib\LM555.sub"

I also tried saving the LM555.sub into file LM555.lib, but no luck either.

What am I doing wrong?

 

You did it right, here:

If I copy the subcircuit into the folder:
C:\Program Files\LTC\LTspiceIV\lib\sub\LM555.sub

LTSPICE can find the subcircuit and execute properly.

You'll save yourself a lot of trouble if you just keep your .sub and .lib files in the C:\Program Files\LTC\LTspiceIV\lib\sub directory. The .asy files you can put in various subdirectories, but I suggest pretty much sticking with the established directory structure - otherwise, if you're swapping .asc files around with other people for troubleshooting or whatever, you can wind up having problems loading the symbols.