# Need help to solve this op amp

Discussion in 'Homework Help' started by horrormyth, Apr 28, 2012.

1. ### horrormyth Thread Starter New Member

Apr 28, 2012
1
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Hi Everybody,
I'm just new to electronics
Need a little help from you guys to solve this opamp,from where to start....
Need very step by step ...and thorough help

If vin =30 mv find vout

Would be great...
Thanks

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2. ### blah2222 Well-Known Member

May 3, 2010
565
33
To start, you can assume that this is an ideal op-amp operating in the negative feedback mode and make two assumptions:

1) V+ = V- and
2) I+ = I- = 0

What these means is that there is no current entering the input terminals of the op-amp and that both of the input voltages with be equal.

Since V+ is tied to ground, V- will therefore be equal to ground using this model. KCL can be used to establish equations in terms of Vin, V-, and Vout and you will be able to solve Vout as a function solely of Vin.

Hope that helped.

Oct 10, 2011
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