LM741 Audio Amplifier Emergency

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SUMMARY

The discussion centers on building an audio amplifier circuit using the LM741 operational amplifier, with a requirement to utilize only resistors and capacitors. Participants emphasize the importance of self-research and suggest consulting resources like Douglas Self's recommendations on paralleling multiple opamps for improved output. The LM741 is critiqued as outdated, with suggestions for alternative opamps like the LM324. The conversation highlights the need for foundational knowledge in circuit design and encourages users to seek out introductory textbooks for guidance.

PREREQUISITES
  • Understanding of basic electronics concepts, including resistors and capacitors.
  • Familiarity with operational amplifiers, specifically the LM741.
  • Knowledge of audio circuit design principles.
  • Ability to read and interpret circuit diagrams.
NEXT STEPS
  • Research Douglas Self's techniques for paralleling opamps in audio applications.
  • Learn about alternative operational amplifiers such as the LM324 and their advantages over the LM741.
  • Explore introductory textbooks on audio electronics and circuit design.
  • Investigate online resources and forums for practical circuit examples and troubleshooting tips.
USEFUL FOR

Electronics students, hobbyists building audio amplifiers, and anyone interested in learning about operational amplifier circuits and audio signal processing.

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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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@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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