basic node equitons using kirschoff

Discussion in 'General Electronics Chat' started by bumle90, Mar 27, 2005.

1. bumle90 Thread Starter New Member

Mar 27, 2005
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Hello.
I am having a little problems writing nodal equations using kirschoffs law for a pretty basic circuit.
I need to write equations for the nodes : a, b and c.

I have attached circuit drawing as a bmp-file, and hope that somebody can help me out a little.

Many regards from here.

2. bumle90 Thread Starter New Member

Mar 27, 2005
6
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Ohh and I forgot to mention that
x(t) is the input and y(t) is the output.

3. hgmjr Moderator

Jan 28, 2005
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214
Would you be interested in a solution that uses Millman's Theorem or are you interested in seeing the Kirchoff's Law solution only?

4. bumle90 Thread Starter New Member

Mar 27, 2005
6
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Well, I think Kirschoff will suffice.
I would be very grateful.
Thank you very much

5. bumle90 Thread Starter New Member

Mar 27, 2005
6
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I have written the following equations: (Are they completely wrong or.. ? )

a: -(Va/R1)+((Va-Vb)/R2)+(C1*(d(y(t)-Va)/dt))=0

b: -((Va-Vb)/R2)+(C2*(d(Vb)/dt))=0

c: -((y(t)-Vc)/R4)+Vc/R3=0

6. bumle90 Thread Starter New Member

Mar 27, 2005
6
0
hmm i guess nobody can help me? :/