# Electronic Devices - Op-Amp Applications - Discussion

Discussion Forum : Op-Amp Applications - General Questions (Q.No. 2)

2.

Calculate the output voltage if V

_{1}= –0.2 V and V_{2}= 0 V.

Discussion:

13 comments Page 1 of 2.
Amit said:
6 years ago

As we see in the circuit, -o.2 is applied at the negative terminal so the op-amp is inverting op-amp. By general description, we calculate drop across 33k by ohms law. We get 1/165 amp and in other branches we applied same ohms law and we get 0 amp coz v=0v. Now add both the currents and applied again ohms law at feedback branch 330k we get vo= 2volt.

Muhammad Younas said:
7 years ago

Good work, Thanks for explaining it.

(1)

Neeharika said:
7 years ago

By nodal analysis (0 -V1)/33k+(0-V0)/330k = 0.

0.2/33k-V0/330k = 0.

V0 = 2v.

0.2/33k-V0/330k = 0.

V0 = 2v.

(1)

Raviraj said:
7 years ago

vo = -[330/33 (-0.2)] = 2v.

(1)

Surya said:
7 years ago

If the voltage source is connected to the positive terminal of an op amp and ground is connected to the negative terminal of the op amp then it's called as "non-inverting amplifier". If the terminals are reversed then acts as inverting amplifier.

(1)

Seema Rajput said:
8 years ago

Vo = (-Rf/R1)V1 + (-Rf/R2)V2.

= (-330k/33k) * (- 0.2v) + (- 330/10k) * 0.

= (- 10) * (-0.2) + 0.

Vo = 2V.

= (-330k/33k) * (- 0.2v) + (- 330/10k) * 0.

= (- 10) * (-0.2) + 0.

Vo = 2V.

(5)

Mb3r said:
8 years ago

What the different between non and inverting op amps?

Indu said:
9 years ago

Here given the amplifier is summing opamp and the solution of the given problem.

vo = -[330/33 (-0.2)] = 2 v.

vo = -[330/33 (-0.2)] = 2 v.

MMA said:
10 years ago

Vout = -330k{(-0.2/33k)+(0/10k)}.

= -330k(-0.2/33k).

= 2 volt.

= -330k(-0.2/33k).

= 2 volt.

Dipanjan said:
1 decade ago

Ii=(V1-0)/33 [Ii=input current through 33k)

If=(V0-0)/330 [If=feed back current through 330k)

I-=(Ii)+(If) [Kirchhoff law at opamp input node]

As input impedance of opamp is Infinite So Input current(I-) is zero.

(Ii)+(If)=0

Ii=-If

V1/33=-V0/330

V0=-10*V1=-10*(-0.2)=2V

If=(V0-0)/330 [If=feed back current through 330k)

I-=(Ii)+(If) [Kirchhoff law at opamp input node]

As input impedance of opamp is Infinite So Input current(I-) is zero.

(Ii)+(If)=0

Ii=-If

V1/33=-V0/330

V0=-10*V1=-10*(-0.2)=2V

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