I am a beginner in op-amp design and would like to get an explanation to a circuit that has a diode wired in between the output of op-amp-1 (stage 1) and the input of op-amp-2 (stage 2).
The inverting input of op-amp-1 takes a voltage from 0V <= x <= 5V, while the non-inverting input is wired to a 1kOhm potentiometer. The output has a 100kOhm||0.001uF for feedback.
Then, that output is connected to a 10kOhm in series with a 1N4149 diode. That signal is sent through a 0.1uF||100kOhm pot before being used as an input to the second stage (op-amp-2).
Furthermore, if someone could explain the the inclusion of the 0.1uF in parallel with the pot, that would be very beneficial to my understanding.
Thank you for looking this over.