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?
