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Input Current I1? How to start through hand calculation

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anilp

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Given Op amp is Ideal, Vout= -2.1. I am looking to find I1(Current)
I tried node analysis but dint get
I converted current(I1) and shunt resistor(R4) to voltage and series resistor, Can i do like this or Am i doing wrong.
How can i find I1 if Vout and all resistor are give..
I tried in LTspice got I1 ~ 0.564mA but how? Q1.png
 

I got almost the same answer I1 = 0.56328mA.

I didnot convert the current(I1) and shunt resistor(R4) to voltage and series resistor. Do the Nodal Analysis as it is.
The circuit has four nodes, so four equations. Solve them. You will get the answer for I1.

---------- Post added at 06:25 ---------- Previous post was at 05:54 ----------

I solved the equations using Maple. I attached the ckt, in which the four nodes that I used are marked.Solved the four equations and also attached the solution. Just go through it.


Enjoy..
 
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    anilp

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Thank you Very Much!
Previously when i was doing node analysis i forgot to consider I(current) at nodes V3 & V4. As you taken in eq(3) & eq(4)
It is helpful
 

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