LM741 Audio Amplifier Emergency

[yalcinkaya]

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?

 

[BvU]

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 ) some activity from your end.
What did you google or undertake otherwise so far ?

 

[AlexCaledin]

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

 

[BvU]

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)

 

[berkeman]

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]

Link? Seems strange

https://www.elektormagazine.com/magazine/elektor-201010/19460

I have the PDF but uploading fails. There are 32 dual 5532s.

 

[berkeman]

https://www.elektormagazine.com/magazine/elektor-201010/19460

I have the PDF but uploading fails. There are 32 dual 5532s.

I'll PM you my e-mail address so you can just e-mail it to me. Thx.

 

[DaveE]

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.

 

[gneill]

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.

 

[BvU]

@yalcinkaya : other than PF doing the exercise for you, is there anything specific you need assistance with ?

 

[AlexCaledin]

This is how to connect opamps (their total price is less than 20 Great British Pounds, see the PDF)