I'm studying basic components of electronic circuits, but I don't major in electronic engineering, so I have no idea why this following problem occurs.
In an inverting op-amp circuit, I learnt that the input voltage will be amplified by -R2/R1, but when I actually test it, it doesn't work at all.
So I learnt Qucs and simulated this circuit:
I found that the OP07 (op-amp) was working according to my expectations only at very low voltages (near 10 mV).
As a result of several tests I found it works near 0.04 V, but it doesn't work as I expected; in the area of more than 2 V it is amplified consequentially, but it is not the inverting circuit that I studied.
As you can see in the LSV result, it is working only in the 0-0.04 V area.
I expected more, even at 0.04V it must be amplifed as per the equation Vout = -R1/R2*Vin, but it isn't.
So I want to know, which part is wrong, and why it acts like this?