First time poster and a beginner at electronics, please tell me if any formatting is wrong.
I implemented this amplifier and filter circuit and connected it with a function generator as input to see if it worked. It did, but I do not understand it's behaviour. At about 70k frequency, input 272mV gives me 1.56V as output. But the gain starts to be less than 1 when I put anything above 1V as input. For example, 4.8V gives me 280mV as output. All this was observed on an oscilloscope. Would anyone please explain how that happens?