# Electronic Devices - Op-Amp Applications - Discussion

### Discussion :: Op-Amp Applications - General Questions (Q.No.6)

6.

Calculate the output voltage if V1 = V2 = 0.15 V.

 [A]. 0 V [B]. 4.65 V [C]. 6.45 V [D]. –6.45 V

Answer: Option D

Explanation:

No answer description available for this question.

 Chandan Natkar said: (Sep 25, 2011) It is inveting summer Vo=(-Rf/R1)V1+(-Rf/R2)V2 =(-330/33)0.15+(-330/10)0.15 =-1.5-4.95 =-6.45

 Mallik said: (Mar 26, 2012) Ok just. If you find it difficult to remember formula .. here is the way... rules 1)both the terminals of Op-amp are always at same voltage levels, 2)current entering into Op-amp is always '0'. now write equation [(V1-Vb)/33k]+[(V2-Vb)/10k]+[(Vo-vb)/330k] = 0; from KCL (10*V1)+(33*V2)+Vo=0 => Vo= -(43*0.15) V0= -6.45

 Rajasekhar said: (Jan 26, 2014) What is vb? and how can you solve the problem?

 Subrat said: (Jun 12, 2014) Vb is the voltage at non inverting terminal (-ve).

 Madhu Adkar said: (Oct 6, 2015) Since non inverting terminal is grounded Vb=0V.

 Mulata said: (Apr 3, 2016) Yes, but what about +9 V and -9 V?

 Vijay said: (Jul 19, 2016) That is the saturation voltage.

 Amit said: (Feb 22, 2018) Vout=. --- {(v1/r1+v2/r2)} / (1/rf). Gives -6.45 volt. Above formula is for inverting op amp.

 Shudi said: (Jan 18, 2022) What if v1 and v2 are in AC? Please explain.

#### Post your comments here:

Name *:

Email   : (optional)

» Your comments will be displayed only after manual approval.

#### Current Affairs 2022

Interview Questions and Answers