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Yep, thanks for the advice, that's more effecient and simpler than building a multi-stage DC power supply.

Yes, that network of the voltage divider resistors would be difficult to reach equal voltages on the lines going to the op-amp for a simple experiment.

If this experiment is very important for the course and future experiments depend on this one, then it's now required to build a more developed setup with much more improved real-world simulation for voltage signals which I think are related to audio applications.

Also, another important point I read about in this link:

https://www.svce.ac.in/amplifier741/theory.html

Is that if I disconnect one of the input signals, the output gain changes, so the circuit designer must count the number of the incoming signals and adjust the values of other components accordingly.

Yep, that's also another idea, but it's the college laboratory, I don't think they would provide batteries for this experiment.

Do you mean by buffered voltages, the voltages from the batteries of other type of voltage source ?

Also a good idea, but as the picture I posted in the first post, the laboratory components in a plastic boxes system, I only have the 741 type. So the only way I could think of is developing a voltage divider thinking it might work, but I learned a new lesson of taking out the lines of the voltage divider and supplying them to the op-amp didn't work even with using series 10k resistors which added another implication to the experiment becuase now I must calculate with thevinin theorem each voltage and adjust its resistor circuit to get equal voltage values.

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This worked surprisingly, I don't know why, it's a parallel circuit. Could it be that the op-amp is summing the currents ?

Also, R19, 18, 17 are adjusted according the gain, to get a unity gain. But if I change the value of any resistor, then the output gain changes too. So as I assumed that the voltages and the currents of the input circuit must be set and adjusted to the required output gain.

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