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I find this program, qucs, that looks very interesting. But it seems counterintuitive and I can't get it to work. I did this simple circuit

enter image description here

But when I said to qucs to run it, it gave an unspecified error...

enter image description here

what am I doing wrong? I'm very interested in working with this program and I spent hours trying ti understand what to do. But in vain.

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    \$\begingroup\$ Add a ground reference? (Most electronics simulators want one.) \$\endgroup\$
    – jonk
    Aug 5, 2021 at 22:44
  • \$\begingroup\$ Qucs sucks, try this tinyurl.com/yzpyjlvf \$\endgroup\$ Aug 6, 2021 at 1:49

3 Answers 3

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According to qucs beginner's tutorial PDF, you need a ground reference.

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  • \$\begingroup\$ Where can one find this PDF? \$\endgroup\$
    – Karlo
    Jun 30, 2022 at 14:26
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A capacitor value of only 1pF is nothing. Try 1uF which is a million times more. Then when the battery is applied the capacitor will be fully charged in about 0.00025 of a second.

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You want to add a simulation from the simulations tab. So here you probably want to do a transient simulation.

Simulations tab

Further you need to add a ground node to your schematic.

Finally, for the capacitor you need to set an initial condition. You can do this in the capacitors properties.

Capacitor properties

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