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I saw the ability to control R by time in someone's drawing, tried it, and it worked fine. Then, I thought that I could use that "time" keyword also to control the voltage of a DC source. However it didn't work. It gives an error:

Error on line 2 : vcc n001 0 time*2 Unknown parameter "time*2" Vcc: Missing value, assumed 0V @ DC .OP point found by inspection.

So, is there an easy way, as easy as it is with the resistor value, to do what I want?

  • \$\begingroup\$ If in doubt, try to wrap your expression with {}. So you may write {time*2} and see how that works. \$\endgroup\$
    – jonk
    Dec 1, 2019 at 20:38
  • \$\begingroup\$ @jonk nope, didn't work \$\endgroup\$
    – muyustan
    Dec 1, 2019 at 20:50

1 Answer 1


The problem is you try to make an alterating voltage source with a DC source.
Use Arbitrary behavioral voltage source (BV) instead. You don't need curly braces for that, just V=time*10m

  • \$\begingroup\$ I can't find an "arbitrary behavioral voltage source" \$\endgroup\$
    – muyustan
    Dec 1, 2019 at 20:52
  • 3
    \$\begingroup\$ @muyustan look for bv \$\endgroup\$
    – Huisman
    Dec 1, 2019 at 20:53

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