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OP AMP Gain for complex circuit

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Bandit03

New Member
Can someone verify the gain of this op amp circuit?
The frequencies I will be testing the circuit at are 1, 10, 100 and 500 Hz.
I would like to know the method and values of the theoretical gain.:)
The circuit diagram is in the attachment.
Values are
R14 = 3570
R15 = 57600
R16 = 2320
R17 = 59000
C3 = 0.000000033 Farads
C4 = 0.000001 Farads
L1 = 6 Henries
 

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ericgibbs

Well-Known Member
Most Helpful Member
Can someone verify the gain of this op amp circuit?
The frequencies I will be testing the circuit at are 1, 10, 100 and 500 Hz.
I would like to know the method and values of the theoretical gain.:)
The circuit diagram is in the attachment.
Values are
R14 = 3570
R15 = 57600
R16 = 2320
R17 = 59000
C3 = 0.000000033 Farads
C4 = 0.000001 Farads
L1 = 6 Henries
hi,
Is this a school problem.?:)
 

ericgibbs

Well-Known Member
Most Helpful Member
NO, I am a mechanical engineer and I am trying to understand this op amp circuit in our test stand.
OK, I assume that R15 is the voltage input and R14 is at 0V.?
 

ericgibbs

Well-Known Member
Most Helpful Member
Both have voltages applied to them.
hi,
This is with one signal on the NINV input.

Whats the voltage level of the two inputs.??

EDIT: with both inputs linked.

Its a 65Hz notch filter [60 Hz]
 

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Last edited:

Bandit03

New Member
I will need some time to disect, but generally yes.
What program did you use to do the analysis?

The plots looks accurate since the resonant frequency is 64 Hz.

Thanks for your help, the plots should help me know if I calculated the right gains.
 

ericgibbs

Well-Known Member
Most Helpful Member
I will need some time to disect, but generally yes.
What program did you use to do the analysis?

The plots looks accurate since the resonant frequency is 64 Hz.

Thanks for your help, the plots should help me know if I calculated the right gains.
hi,
You can download free, LTSpice simulator.

If you do, you can run the attached file.:)
 

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Hero999

Banned
Please don't call µF mF, it's very confusing, mF really means 0.001F.

Use µF for values <99,999µF and F for values >0.1F.

If you can't write µ for whatever reason use u.
 

ericgibbs

Well-Known Member
Most Helpful Member
Please don't call µF mF, it's very confusing, mF really means 0.001F.

Use µF for values <99,999µF and F for values >0.1F.

If you can't write µ for whatever reason use u.
hi,
Am I missing something, where is the mF, uF stated in this thread.?
 

andy257

Member
Erricgibbs : If you look at the original posters attachment of the circuit he is trying to understand you will see hes labeled some of the components. That is what Hero999 is getting at.
 

Bandit03

New Member
Eric,

What you provide me was exactly what I needed and you used the values I provided which was correct.

Hero is right the mF should of been uF in the .jpg.

Thanks again for helping a ME out.
 

ericgibbs

Well-Known Member
Most Helpful Member
Erricgibbs : If you look at the original posters attachment of the circuit he is trying to understand you will see hes labeled some of the components. That is what Hero999 is getting at.
hi andy,
You are right.:)

When Bandit posted the actual parts list, where the part notations are correct I ignored the values on the jpg.
 
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