I have an assignment to simulate in and output in pspice and compare my results to what i messured in real life using functiongenerator, oscilloscope and generator. The problem is i dont know how to get the sinuscurved display when i simulate, i only get straight lines... I already have my messurements on paper where i calculated different frequencies then compared in and ut to see if it applified. I would really be grateful if you helped me guys :(

  • \$\begingroup\$ Are you running a transient analysis? \$\endgroup\$
    – owg60
    Dec 1, 2016 at 15:13

1 Answer 1


i only get straight lines

That's because: -

V2 is the wrong way round and there are no power supplies to the op-amps. Neither is there a ground connection along the bottom horizontal connection between V1 and R6.

  • \$\begingroup\$ wow didnt see that, well i fixed the V2 and there is a ground connection on the bottom line i forgot to place a junktion silly me. But how do i power the op amps? \$\endgroup\$
    – jumper
    Dec 1, 2016 at 15:29
  • \$\begingroup\$ Use V2 to apply positive voltage to the pin marked V+ \$\endgroup\$
    – Andy aka
    Dec 1, 2016 at 15:36
  • \$\begingroup\$ Oh okey thank you didnt see that i forgot to place wires there. it looks like this now: ![velleman.png](postimg.org/image/z8o6etrip) Its stil a straight line though, do i need to change something in the settings? ![vellemandata.png](postimg.org/image/lseidlv0p) \$\endgroup\$
    – jumper
    Dec 1, 2016 at 16:08
  • \$\begingroup\$ Well, it looks like V1 is not producing a signal and it should. Check the settings for V1. \$\endgroup\$
    – Andy aka
    Dec 1, 2016 at 17:47
  • \$\begingroup\$ I almost fixed it, i added a different sinus power source look: velleman.png But i dont know what to put in AC? Simulation: ![vellemandata.png](postimg.org/image/s9me6k4hb) \$\endgroup\$
    – jumper
    Dec 1, 2016 at 17:52

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