Unfortunate change that was added when LTspice went to
It appears that the symbols pre-date LTspice XVII, which
"VCC" elsewhere on your schematic that is driven by the But it requires that you have a net named Symbol doesn't show the power and ground pins, but theyĪre there. These models and symbols are made in a way so that the
Open the last one (don't use Notepad) and follow it. Not the manufacturer's models, and they are mostlyīehavioral, not built from actual transistor modelsįor the HC161, I recommend downloading these: Helmut Sennewald created models for several HC devices, The auto-generated symbol itself brings in the subcircuit model. One more thing to mention: When you use an auto-generated symbol, don't also include the subcircuit text in your simulation. Either way, it opens just the model file itself in a separate window, not in the schematic.
#FINDING GROUND IN LTSPICE FOR MAC MAC#
I'm not familiar with the Mac version, but in the Windows version I would go to File > Open, and then locate the model (subcircuit) file or I can drag-and-drop the file to the LTspice window. That is the wrong way, because now the auto-generated symbol tries to use that netlist file as the model file when you use it in a simulation. You copied it into your schematic, then opened the netlist file and auto-generated from that file. But if you do ever use auto-generate, this is an important step: Open the model file directly in LTspice. You wrote: " Symbols were generated automatically by copying the subciruit text to the schematic, opening the netlist and using automatic symbol generation." Again I want to emphasize that you (probably) did not need to auto-generate the symbol file for the part whose model you downloaded from this group. It might be the cause of the original problem you had. I recommend that everyone who auto-generates a symbol then edits that symbol so that it doesn't point directly to the file. Did it find it or not find it? If you auto-generate a symbol in LTspice, then you must never move (or change the filename of) that model file, because the auto-generated symbol points directly to that file. I don't understand this: " It seems that the compiler is finding the subcircuit because it complains when it can't find it." What compiler? LTspice? At what step? I thought you wrote that LTspice just crashes with no error messages. Chances are 99% or better that there was one already. Anyway, you should not have needed to auto-generate a symbol for the model you downloaded, if you downloaded it from this group. The problem with Groups.io's search for files, is that it doesn't directly show you the directory where the file is, where you could see its symbol file too. Either they can use a symbol that already comes with LTspice (such as a transistor, or an op-amp), or the symbol file was uploaded with the model file. Warren, There are very few SPICE models in this group that do not have a symbol already. That was an unfortunate change that was added when LTspice went to version XVII, which caused previous schematic text to now look tiny. It appears that the symbols pre-date LTspice XVII, which means they have tiny text fonts. But it requires that you have a net named "VCC" elsewhere on your schematic that is driven by the DC power source (normally 5V). These models and symbols are made in a way so that the symbol doesn't show the power and ground pins, but they are there. For the HC161, I recommend downloading these: Open the last one (don't use Notepad) and follow it. He made them himself, so they are not the manufacturer's models, and they are mostly behavioral, not built from actual transistor models (except a few). Warren, Helmut Sennewald created models for several HC devices, including the HC161.
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