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Orcad Capture Help
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Irfan
electronics forum beginner


Joined: 16 May 2006
Posts: 11

PostPosted: Tue Jun 20, 2006 8:52 pm    Post subject: Orcad Capture Help Reply with quote

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:
http://i5.tinypic.com/153l8jb.jpg
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Alan B
electronics forum Guru Wannabe


Joined: 05 May 2006
Posts: 137

PostPosted: Wed Jun 21, 2006 12:00 am    Post subject: Re: Orcad Capture Help Reply with quote

On 20 Jun 2006 13:52:56 -0700, in message
<1150836776.629547.130580@c74g2000cwc.googlegroups.com>, "Irfan"
<h.irfan@gmail.com> scribed:

Quote:
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:
http://i5.tinypic.com/153l8jb.jpg

Do you mean "simulate," or do you mean "solve?"
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Dorian McIntire
electronics forum beginner


Joined: 09 Feb 2006
Posts: 39

PostPosted: Wed Jun 21, 2006 12:51 am    Post subject: Re: Orcad Capture Help Reply with quote

"Irfan" <h.irfan@gmail.com> wrote in message
news:1150836776.629547.130580@c74g2000cwc.googlegroups.com...
Quote:
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:
http://i5.tinypic.com/153l8jb.jpg




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



Dorian
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Irfan
electronics forum beginner


Joined: 16 May 2006
Posts: 11

PostPosted: Wed Jun 21, 2006 3:13 am    Post subject: Re: Orcad Capture Help Reply with quote

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.
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Alan B
electronics forum Guru Wannabe


Joined: 05 May 2006
Posts: 137

PostPosted: Wed Jun 21, 2006 1:31 pm    Post subject: Re: Orcad Capture Help Reply with quote

On 20 Jun 2006 20:13:09 -0700, in message
<1150859589.177103.156830@y41g2000cwy.googlegroups.com>, "Irfan"
<h.irfan@gmail.com> scribed:

Quote:
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.

Ask your teacher.
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acataldo@yahoo.com
electronics forum beginner


Joined: 14 Jun 2006
Posts: 9

PostPosted: Thu Jun 22, 2006 12:54 am    Post subject: Re: Orcad Capture Help Reply with quote

Irfan wrote:
Quote:
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:
http://i5.tinypic.com/153l8jb.jpg



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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Google

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