Electronic Devices - Op-Amp Applications - Discussion

Discussion :: Op-Amp Applications - General Questions (Q.No.10)

10. 

Calculate the input voltage if the final output is 10.08 V.

[A]. –1.05 V
[B]. 0.525 V
[C]. 0.168 V
[D]. 4.2 V

Answer: Option C

Explanation:

No answer description available for this question.

Suresh Nagaraj said: (Sep 17, 2011)  
Vo/Vin=(1+Rf1/R1)*(-Rf2/R2)*(-Rf3/R3)

10.08/Vin=2*1*30

Vin=0.168 V

Mallik said: (Mar 26, 2012)  
Keep in mind that there are two inverting and one non-inverting amplifiers.. gain of whole system is G= G1*G2*G3
G1 non-inverting
G= (1+10k/5k)*(-5k/5k)*(100k/5k)
Vout/Vin=60;
=> Vin= 0.168;

Sonam said: (Aug 14, 2014)  
Vo = (1+10k/5k) * (-5k/5k) * (-100k/5k) V1.
Vo = 3 * -1 * -20 V1.
V1 = 10.08 / 60.
V1 = 0.168.

Asdf said: (Sep 21, 2017)  
Explanation is awesome, thank you @Mallik.

Jayzeebeee said: (Feb 5, 2018)  
Take input as x:

So the equation becomes;
10/5*x+2x*100/5=>2x+2x*20=10.08.
so x=10.08/80=0.168.

Abhilash said: (Apr 24, 2018)  
Good explanations. Thanks to all.

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