LM741 Audio Amplifier Emergency

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Discussion Overview

The discussion revolves around creating an audio amplifier circuit using the LM741 operational amplifier, with a focus on the components allowed (resistors and capacitors) and the practical aspects of circuit design. Participants explore various approaches and considerations related to the design and application of the amplifier.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant requests assistance in building an audio amplifier circuit with the LM741, specifying the use of only resistors and capacitors.
  • Another participant questions the requirement to use only those components and asks about the research the original poster has conducted.
  • A participant references audio expert Douglas Self's suggestion to connect multiple opamps in parallel with output resistors to the speaker, noting that he has experimented with 30 or 40 opamps.
  • Some participants express skepticism about the practicality of using the LM741, describing it as outdated compared to other options like the 324 or discrete transistors.
  • Concerns are raised about the appropriateness of advanced techniques for someone working on a homework assignment, suggesting that simpler solutions may be more suitable.
  • Participants share links to external resources and discuss the challenges of sharing documents, indicating a collaborative effort to provide information.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best approach to building the amplifier, with some advocating for the use of the LM741 and others suggesting alternative components or methods. The discussion remains unresolved regarding the most effective way to assist the original poster.

Contextual Notes

There are indications of varying levels of understanding and experience among participants, with some suggesting that the original poster should conduct more research or refer to textbooks for foundational knowledge.

Who May Find This Useful

This discussion may be of interest to students working on audio amplifier projects, hobbyists exploring circuit design, and individuals seeking to understand the practical applications of operational amplifiers in audio systems.

yalcinkaya
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Summary:: Hi guys! I need to make a audio amplifier circuit with LM741. I have to use only resistors and capacitors. I can't built it. Can you help me please?

Hi guys! I need to make a audio amplifier circuit with LM741. I have to use only resistors and capacitors. I can't built it. Can you help me please? And can you show where exactly I should connect mic and speaker?
 
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yalcinkaya said:
I have to use only resistors and capacitors
and the LM741, and some power supply, of course.

Says who ?
Is this homework ? ANyway, PF asks ( = requires :smile:) some activity from your end.
What did you google or undertake otherwise so far ?
 
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The audio expert Douglas Self says , it's good to connect many such cheap opamps as followers in parallel, with an output resistor from each opamp to the speaker. He himself tried paralleling 30 or 40 opamps to begin with. I think his speaker was 8 Ohm or maybe 16 Ohm.

https://www.elektormagazine.com/magazine/elektor-201010/19460
 
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yalcinkaya said:
hello. yes this is my homework. can you help me please
That's what PF is for, but you have to tell us how to help you -- PF doing your homework for you only robs you of the exercise. So: what have you done so far ?

The usual path is to look up information on the circuit, application notes, etc. You found those ?
If they are too complicated, a introductory textbook is a good place to find easy examples. Do you have a textbook, or relevant course notes ?

Re emergency: lack of planning on your part is no cause for emergency on the side of helpers (edited quote from a poster on the wall of my IT helpdesk)
 
AlexCaledin said:
The audio expert Douglas Self says , it's good to connect many such cheap opamps as followers in parallel, with an output resistor from each opamp to the speaker.
Link? Seems like strange advice to me for a couple of reasons...
 
AlexCaledin said:
The audio expert Douglas Self says , it's good to connect many such cheap opamps as followers in parallel, with an output resistor from each opamp to the speaker. He himself tried paralleling 30 or 40 opamps to begin with. I think his speaker was 8 Ohm or maybe 16 Ohm.

https://www.elektormagazine.com/magazine/elektor-201010/19460
While an interesting idea for some of us, I don't think this is helpful advice for someone doing homework to figure out how to make a simple amplifier circuit.

For the rest of us, I can't see why anyone would actually still use a 741. It is a dinosaur if ever there was one. I know y'all will say it's cheap, but so are others like 324's and discrete transistors.
 
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DaveE said:
For the rest of us, I can't see why anyone would actually still use a 741. It is a dinosaur if ever there was one. I know y'all will say it's cheap, but so are others like 324's and discrete transistors.
The only good reason I can think of is that there's a LOT of literature and examples out there (years and years worth) using the venerable 741.
 
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  • #10
@yalcinkaya : other than PF doing the exercise for you, is there anything specific you need assistance with ?
 
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This is how to connect opamps (their total price is less than 20 Great British Pounds, see the PDF)
DouglasAmp.PNG
 

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