Design LM324 Op Amp Inverting Amplifier with Gain of 50

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Discussion Overview

The discussion revolves around designing an inverting amplifier using the LM324 op amp with a specified gain of 50. Participants address the requirements for the circuit, including the measurement of cut-off frequency and the plotting of results as a function of log(frequency).

Discussion Character

  • Homework-related, Technical explanation

Main Points Raised

  • One participant requests assistance with the design of an inverting amplifier circuit using the LM324 op amp.
  • Another participant questions whether the op-amp is assumed to operate in its linear region during the design process.
  • A participant provides a circuit diagram and specifies the need for two power supplies, detailing the voltage requirements for the op-amp.
  • The gain of the circuit is mentioned as being determined by the resistor values, suggesting a calculation for the resistor needed to achieve the desired gain.

Areas of Agreement / Disagreement

The discussion includes multiple viewpoints regarding the circuit design and assumptions about the op-amp's operation, indicating that there is no consensus on all aspects of the design.

Contextual Notes

Participants have not fully resolved assumptions regarding the linear operation of the op-amp or the specific resistor values needed for the gain calculation.

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Homework Statement



1. Using the LM324 op amp build an inverting amplifier with a gain of 50.
Measure the cut-off frequency.
2. Plot your results on a graph as a function of log(frequency). Comment on the
results


Homework Equations





The Attempt at a Solution


Can some one give me a hand with a please
 
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Do you assume your op-amp works in linear section in the process?
 
This is for a lab so I'm not completely sure but I assume so.
 
You would need a circuit like this:

[PLAIN]http://dl.dropbox.com/u/4222062/opamp%20non%20inv%202%20bias.PNG

The circuit requires two power supplies. One of them has its negative terminal grounded and supplies +12 V to the opamp.
The other has its positive terminal grounded and it supplies -12 V to the circuit.

The gain of the circuit is = R / 1000 so you can calculate the value of R. You may need two resistors in parallel to get this value.
 
Last edited by a moderator:
THANKS vk6kro
 

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