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Orcad Capture Help

Discussion in 'Electronic Basics' started by Irfan, Jun 20, 2006.

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  1. Irfan

    Irfan Guest

    How can i simulate the circuit below as it has no source. How can i
    insert the value of 9mA,8mA and 12mA current flowing through the wires.

    Circuit diagram link:
  2. Alan B

    Alan B Guest

    Do you mean "simulate," or do you mean "solve?"

  3. The arrows are the current sources.

    You've got to learn Kirchhoff's current law and forget the simulation stuff
    until later. Kirchhoff's current law states that the sum of currents
    entering a node is zero.

    Assume all currents flowing into a node are positive and currents leaving a
    node are negative (any assumption will work as long as you're consistent):

    8mA - i1 - 12mA = 0: 8mA - 12mA = i1 = -4mA

    12mA + i3 - 9mA = 0: -12mA + 9mA = i3 = -3mA

    9mA - i2 - 8mA = 0: 9mA - 8mA = i2 = 1mA

    Check: I2 + I1 - I3 = 0: 1mA + (-4mA) - (-3mA) = 1mA -4mA + 3mA = 0

  4. Irfan

    Irfan Guest

    Yes i know the current law. What i mean here is to make this circuit on
    computer and simulate it using orcad capture cis software or what will
    be the coding of pspice for this circuit.
  5. Alan B

    Alan B Guest

    Ask your teacher.
  6. Guest

    I think what you are trying to do is insert dependent current sources
    for 9-, 8- and 12-mA. Press 'P' for parts (or click on parts), choose
    Source under libraries, then select IDC (DC current source). Click OK
    and place the current sources according to your diagram. Wire the
    circuit, and don't forget to include a ground. I would also include
    some 0 Ohm resistors in the other branches just to make it easier to
    simulate. Save the circuit. Under simulation profile, choose Transient
    and the default period (it shouldn't matter). Press OK and then press
    the blue arrow to simulate the circuit. Click on Add Trace and choose
    I(R1), I(R2), I(R3).
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