Hello, sorry my bad english
I am From Venezuelan
I need help

I need to know if this circuit comprising an operational amplifier that generates a factor of 3.125 to its output can be replaced by a transistor configured in two stages in cascade.
they entered the operational amplifier circuit has an input c which varies from 0 400 millivolts, is captured by the AO and multiply it by 3.125, I want to do the same but with 2N2222 transistors or other you suggest or recommend me p
ero basically be like this in the image, the gain is going to determine this factor, then I have to design this circuit with a gain of 3.125 I understand that but the problem is that when various input output falls please help as I am Venezuelan and part of the world that we are half overdue Help me please. I put the images attached

 

A gain of 3.125 is very low, and can easily be achieved with a two stage amplifier. A single stage BJT amplifier would do the job. Presumably you want two stages in cascade to eliminate the phase inversion you get from a single stage BJT amplifier.

If you want an accurate gain of 3.125, that will take some trial-and-error with those component values which determine the overall cascade amplifier gain.

The advantage of the operational amplifier is that you can achieve a known gain with greater ease by a simple selection of input and feedback resistors. Using 1% resistor tolerances in the OA case will give a notional gain tolerance of 2%.

Perhaps I should ask - why do you want to substitute a discrete 2-stage BJT amplifier for a single operational amplifier stage?