Francisco J. Velasco

Thanks for the information, but I still don't know how to use Linux's most current versions (I only have some notion of a long time ago), and I see that I would have to do things that I do not understand right now. I downloaded qucs because it was free and worked under W10. And although I have in mind to install Linux (possibly Ubuntu) and look at how it works, I currently use W10 and I have no enough form to put myself with Linux with a minimum of seriousness. Therefore, any solution that has to...

gnucap works under windows 10? My Qucs version is 0.0.19

gnucap works under windows 10?

I attach the Netlist file, the log when I attempt the simulation, and the data and schemes files. As you will see, a Warning of the DC simulation appears, and I think it can be due to the value of the tension sources. The rest of Warnings I think they are for transistors. They are "ideal" transistors, since I am doing a theoretical study. And I intend to improve the circuit with "real" transistors, from the transistor library, if I can solve this simulation problem.

Hello good. I am studying how the 741 operational amplifier works inside, so I have created a simulation of the internal circuit. When the simulation is of the type DC I have no problems, but when I try to do the simulation of transitory, I get the error that I have indicated, in addition to many warning lines where it places virtual resistances in the transistors. Can someone tell me what fails? This is the circuit that simulates: https://es.wikipedia.org/wiki/Amplificador_operacional#/media/Archivo:OpAmpTransistorLevel_Colored_Labeled.svg...