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Error with 3 input gates
Title
Question
I used 3 input AND gate 74LS15 in one of my project. But the gate is only giving 0.0 output when it should give High( 5 ) and also when it should give Low(2.5e-02).
like the gate is not working.
Please help.

Oscad Schematic-Creation-and-Simulation 09-10 min 0-10 sec 30-04-14, 3:10 p.m. abhiddu

Answers:

Hi, the components that can be simulated are available in the Oscad libraries (that end with the word Spice). So if you want to simulate a digital component, you need to look in the libraries digitalSpice and/or digitalXSpice. If the component is not listed in these libraries (for eg., 74LS15 is not listed), you can't use it for simulation at the moment. We are adding more components to the library. You can also create component libraries and contribute them to Oscad.
30-04-14, 3:24 p.m. rakhiwarriar
We don't know how to create component libraries.
So, when will the 3 inputs and 4 inputs gates be added to the library ? , most of them are available in the component section already.
It'll be great if they are added soon. But if they somehow cannot be added soon, Can we continue using multiple 2 input gates for 3 input and 4 input gates in the example questions ?
30-04-14, 10:18 p.m. abhiddu
Sure, please go ahead and solve the questions using the existing components.
30-04-14, 10:55 p.m. rakhiwarriar
How to create component libraries for this unavailable components?
Can you guide for creating a 4 to 1 mux?
03-05-14, 10:50 a.m. 7skysurfers
Well, what you could do is create a 4:1 MUX using AND, OR gates that are already available. You can then use this in your circuit.
Another option is - You can create 4:1 MUX as a subcircuit and re-use it across projects. To know more about subcircuits, refer to the Chapter on subcircuit builder in the Oscad book. http://www.oscad.in/resource/book/oscad.pdf
03-05-14, 11:17 a.m. rakhiwarriar
What do u mean by Re-Use in these 4-1 MUX?

04-05-14, 7:11 p.m. Ashoka_L
We have started creating component libraries. These would be available soon.
Re-use - I meant 'import'
04-05-14, 7:31 p.m. rakhiwarriar
I have created subcircuit builder of 74LS11 successfully.
but i m getting error in NgSpice-
"vprint8_1.sub: No such file or directory
Error: .include statement failed."
04-05-14, 7:53 p.m. Ashoka_L
Please generate the netlist by unchecking the option "prefix u and ic with x" in the netlist generation step.
04-05-14, 8:21 p.m. rakhiwarriar

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