construct an amplifier with the help of an OP. The amplifier should have the following data Rin = 10 kΩ och Au = -3,3. Draw the components and their value.

Can anybody help me with this, or at least help me start?

 

Welcome to AAC!

construct an amplifier with the help of an OP.

What is an "OP"?

The amplifier should have the following data Rin = 10 kΩ och Au = -3,3.

What is "och Au"?

Can anybody help me with this, or at least help me start?

Is this homework?

 

What is an "OP"?
operational amplifier

What is "och Au"?
is amplification out.

No this is not homework. This is just an exercise and I just need a start to I can solve these problems in the future.

 

What is an "OP"?
operational amplifier

That's a new one for me. I've seen opamp and OA, but never OP.

No this is not homework. This is just an exercise and I just need a start to I can solve these problems in the future.

Do you know how to draw an inverting amplifier circuit? Do you know how to calculate gain for one?

 

It is probably a Swedish abbrevation haha. Yes I do know how to draw an inverted amplifier. With some textbook examples i could probably figure out how to calculate the gain(is the gain Au?) I am swedish as you could guess, so im not familiar with the language.

 

The gain of an op amp is typically given as voltage gain, Av.

 

alright thank you. could it be like Av=R(1)+R(2)/R(1)
(just an example)

 

The inverting amplifier gain is Av = -R2/R1. Your example gain formula is for the non-inverting amplifier.

Try read this and understand how op amp work
https://forum.allaboutcircuits.com/...ns-but-im-troubled-by-them.64696/#post-444315

 

alright thank you. could it be like Av=R(1)+R(2)/R(1)
(just an example)

Without seeing the circuit, it's impossible to tell what the expression for the gain would be since R1 and R2 (what you have as R(1) and R(2)) have no context.

But the expression you have written is guaranteed to be wrong since it is adding something with units of resistance, namely R(1), to something that has no units at all, namely R(2)/R(1).

You need to be careful about order of operations. It WILL bite you if you don't.

 

Your example gain formula is for the non-inverting amplifier.

Actually the formula for the non-inverting amp would be 1 + R2/R1 if R2 is the feedback resistor and R1 is the resistor to ground.

 

In his task there is the inverting configuration:

There's a reason why no one else has posted schematics. The OP said it wasn't homework, but the thread was moved to Homework Help. In Homework Help, we provide guidance, but don't do the work.

Besides, if someone is too lazy to use Google, we shouldn't put more effort into solving their problem than they do...

 

Oh, totally sorry. I understood that he knows how the inverting and non-inverting configurations looks like as he mentioned that in post #5. Everybody started to write equations for opamp's configurations. Hence, I wanted to sum it up as I thought the problem for him is to derive those equations and to understand why the inverting configuration must be used.

If necessary, I will deleted the pictures.

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UPDATE: Previous post deleted.

 

I understood that he knows how the inverting and non-inverting configurations looks like as he mentioned that in post #5.

The OP hasn't shown that he knows anything. Look at post #7.

The circuits you posted are available from many sources. My point is that the OP has shown little initiative. We all want to help, but spoon feeding people doesn't help them learn.

 

Ok, done. Deleted.