Hi guys,

When find the input admittance (Yin) between node 1 and the reference as stated in the attached question,
my answer does not identical with Book answer

plz trace my answer method,,

node 1: 5 V1 + 0.2 V3 + 2(V1 -V3) =0 ===> 7 V1 - 0.8V3 =0
node 2: -0.2V3 + 10 V2 + 20(V2-V3) =0 ==> 30 V2 - 20.2 V3=0
node 3 : 20 (V3-V2) + 2(V3-V1) -3 V2=0 ==> -2V1 - 23 V2 +22V3 =0

so, determinant ΔY = 1319.8 S^3
and Δ11 = ΔY11 = 195.4 S^2

thus,
Yin = ΔY / Δ11
= 1319.8/195.4 = 6.75 (In my book the right answer equal 10.68 )

Could you guide me about my mistake?

 

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http://forum.allaboutcircuits.com/showthread.php?t=84788

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