it has a gain of 57. I am thinking of building your circuit 2 times.
So if you connect the output of one circuit with a capacitor to the input of the other you will theoretically get a gain of 3249. However at such high gains you might get stability problems unless it is constructed with due regard to this sort of gain.Are you sure you want it so high? Or are you after something like a gain of 100, which is simply done by changing the resistor values.
connect the output of one circuit with a capacitor to the input of the other
I did say
A 10uF electrolytic, for example, is ok?
Yes, put the positive to the output and negitave to the input.
Doesn't go the other way?
2) How do I read the input in a ADC of the Arduino, every 1 sec?
If I use 12 Volt supply, can I get something bigger?
But the bigger output signal isn't a result of the gain?
Does it support 12 Volts?