# Analog Electronics Help?

#### conclusionof

Joined Nov 11, 2008
4  #### Firestorm

Joined Jan 24, 2005
353
What part do you not understand on this problem. Just break the problem up. This is a inverting op-amp, so use that formula. You can combine V1 and V2 with addition. If you have a more specific question, please don't hesitate to ask.

#### mik3

Joined Feb 4, 2008
4,843
Vo=-Vin*(R2/R1)

if you take R1 as Z1 and R2 as Z2 then

Z2=R and

Z1=R+jωL

thus

Vo=-(V1+V2)*[R/(R+jωL)]

#### conclusionof

Joined Nov 11, 2008
4
What part do you not understand on this problem. Just break the problem up. This is a inverting op-amp, so use that formula. You can combine V1 and V2 with addition. If you have a more specific question, please don't hesitate to ask.
I dont understand how to add V1 and V2 up since one of them in sinus function while other is in cosinus form.

Also can we use here phasor method ? (Though I know it is not proper to use phasor if the frequencies are not same)

#### mik3

Joined Feb 4, 2008
4,843
If the frequencies are different you cant use phasors to add them. Just use trigonometric identities to add them or expand each sin or cos in a series form, take the most important bits and add them.

What exactly V1 and V2 equal to?

#### Firestorm

Joined Jan 24, 2005
353
You can convert the cos function to a sine function by adding a $$\pi$$/2 to the sine function:

Ex:
sin(A) = cos(A+$$\pi$$/2)