I am learning about operational amplifiers or so called OPAMPS. And I know how to solve these two examples
EXAMPLE 1 - inverting opamp
EXAMPLE 2 - non-inverting opamp
But how to solve these two:
1. The problem statement, all variables and given/known data
IMAGE 1
1. As you can see on picture No1, it is solved, but I need someone to explain to me the logic behind it, because this scheme doesnt match neither inverting or non-inverting opamp. And why formula looks the way it is. Uin = E / ( (r1+r2) / r2 )? If E is Uinput and E goes to +, that means it non-inverting OPAMP, and the usual formula is (R1+Rf)/R1. So thats why I dont understand.
IMAGE 2
This one is similar. The scheme doesnt match to inverting and non inverting opamp, so I am confused how the solution for Uinput is 12,2V.
2. Relevant equations
So if someone can tell me how I can figure out the formula for the first one or the second example, or for any similar scheme when it comes to opamps, I would be really greatful
EXAMPLE 1 - inverting opamp
EXAMPLE 2 - non-inverting opamp
But how to solve these two:
1. The problem statement, all variables and given/known data
IMAGE 1
1. As you can see on picture No1, it is solved, but I need someone to explain to me the logic behind it, because this scheme doesnt match neither inverting or non-inverting opamp. And why formula looks the way it is. Uin = E / ( (r1+r2) / r2 )? If E is Uinput and E goes to +, that means it non-inverting OPAMP, and the usual formula is (R1+Rf)/R1. So thats why I dont understand.
IMAGE 2
This one is similar. The scheme doesnt match to inverting and non inverting opamp, so I am confused how the solution for Uinput is 12,2V.
2. Relevant equations
So if someone can tell me how I can figure out the formula for the first one or the second example, or for any similar scheme when it comes to opamps, I would be really greatful
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