Reading a Schematic and help understanding what materials needed

This is not a good circuit. It looks like someone's experiment...
Clues: It is badly laid out with GND net connections pointing upward (instead of downward towards ground), and messy layout. Also the creator didn't understand how component references work.
Electrical clues: It's using a 741, about the worst op-amp in production today. Crazy-high gain for both stages, making this circuit useless for many typical use-cases due to low bandwidth, plus a high chance that all you will see is (say) +7V or -7V or so on the output, due to input offset not being able to be nulled out enough for the second stage. Datasheet ignored regarding supply decoupling capacitors too.

thank you for the feedback. It is for amplifying the frequencies of plants in the input. So, I may get a greater output feedback without doing harm to the plants, and then using an adc to turn the analog sound into binary to put into my software. Do you have any suggestions on how that could be done?

thank you for the feedback. It is for amplifying the frequencies of plants in the input. So, I may get a greater output feedback without doing harm to the plants, and then using an adc to turn the analog sound into binary to put into my software. Do you have any suggestions on how that could be done?

Hi, more information is required.. to me, the question makes no sense unfortunately.

It probably needs a low offset amp like an OPA2333 hooked up as a non-inverting amplifier with high gain.

 Akosha, the best way to describe an amp to to specify the min and max input voltage, the input impedance, the frequency range, and the expected output. Seems you need AC amp, and not a precision DC, based on your mention of "frequency, sound" and possible spectrum analysis. Is that right? 

• Yeah, that's right. My intended use is to use electrodes to monitor the electrical changes within plants, and to convert that information into a software to produce the sound, so then I can mix my own music and sounds alongside the plant frequencies 

Do standard audio interfaces have the capabilities to do this? I was under the impression I'd have to create a whole circuit for this process. Also if so, any suggestions to go about that. I appreciate your responses.

Avoid this plant  in your recording endevours

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Can you point to any scientific document that describes the phenomenon youre trying to sample? That may help define your technical requirements, because currently there are none.

If it's not something you can find, then perhaps it is something experimental? In which case, you could try a sound card. I doubt it will work, because it sounds like pseudoscience. But I'm open to reading any document if you can provide it.

Maybe you mean impedance measurement, in which case that requires a different circuit.

So by "plant" you really meant a living plant and not the plant in process control. Those signals are rather DC or below 1Hz and in the millivolt range. Sound card will not pick it up, you need a precision low drift low noise DC amplifier with low pass filter. I assume you want something like in this article: https://dacemirror.sci-hub.se/journal-article/529a0faa05eb9b40c5e25b8331ccf9f3/fromm2006.pdf 

There might be some signals in the audio range, but there would also likely be DC or very low frequency signals which would not be captured by the audio input on a PC.

 robogary  LOL