The Student Room Group
Reply 1
You've got a clock on the circuit running at 10hz so I assume that is providing some kind of pulse for the opp amp but that is all I can make out and its a long long time since I did electronics.
It's a non-inverting op-amp circuit, where the gain is (Rf/Rin) + 1.

Basically it allows you to control the gain of a single input without inverting it.

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