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A question about the post FETching Discrete Amplifier

Question asked by alperen on Apr 23, 2017
Latest reply on Apr 24, 2017 by dmercer

Hello analog zone community,

I've been enjoying and reading this post but I don't understand how the circuit in figure.1 works (basically all circuits in the post are the same as the circuit in figure.1). There is a JFET pair configured as differential follower and it is followed by a low noise opamp which has no feedback from its output to its input. How the gain of this such circuit controlled? Isn't a minute difference between the opamp's input satures the opamp in the circuit? How the feedback network is implemented here or is there a feedback network at all?