Hi everyone,


I’m currently a university student, and I’m still learning how to build circuits on a breadboard. I’m trying to understand this microphone-to-earphone amplifier circuit, which uses several LM741 op-amps.


However, I’m finding it difficult to recreate the schematic in Tinkercad or Fritzing due to my limited experience.
If anyone could help me convert the schematic image into a proper breadboard layout in either tool, I would really appreciate it.
Being able to follow the layout and build it step by step would help me get more confident and comfortable with circuit design.


All op-amps labeled IC1–IC4 are LM741.
I'll attach the schematic image below.


Thank you in advance for your help!

 

Welcome to AAC. Might I ask which University?

Now, this section is entitled Homework Help, which means you have to do the work and we get to advise where you might be going wrong, or how to approach the problem better, etc.

What exactly is your difficulty in using Fritzing? There are several good tutorials on Youtube. When you say 'breadboard', do you mean a temporary experimental plug-in board, or a soldered stripboard? While the approach to both is similar, there are some additional considerations with stripboard.

That said, this design uses devices that are nearly 30 years older than you (I'm guessing you're in your 20s; if not, my apologies). There are better, more available, and cheaper, devices that will make this a lot easier and quicker to wire up. I would suggest you consider replacing all 4 devices with an LM348, which is 4 improved opamps in a single package.. I also note a drawing error in the IC2 circuit. I'm tempted to leave that as an exercise for you to research, but I'll be kind and say that the top end of R7 should also connect to IC2 pin 6.

 

Hello,

Your drawing is more like a wiring diagram than a schematic.
Schematics are the language of electronics.

Bertus

 

Hello,

Your drawing is more like a wiring diagram than a schematic.
Schematics are the language of electronics.

Bertus

Maybe. But better than showing a photo of a breadboard layout and asking for advice.

 

I can see problems.

LM741 op amp is old and past its best used date. It will not run on 9 V supply. I needs a minimum of ±9 V.
And as stated before, what you have shown is a wiring diagram. As a student you must learn how to draw a proper circuit schematics.

Here is an example of a schematics.

 

LM741 op amp is old and past its best used date. It will not run on 9 V supply. I needs a minimum of ±9 V.

True, but if you look carefully that circuit does have +/-9v, its just badly drawn...

And as stated before, what you have shown is a wiring diagram. As a student you must learn how to draw a proper circuit schematics.

To be fair to the TS, he didn't draw it; it came from the homemade-circuits.com website, and he never draws proper schematics (and I question many of his designs too, especially the DIY 1kW solar inverter, etc!!!)

 

You're correct. I didn't see the -9V.