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IC2 acts as a negative voltage generator

IC1/A amplifies the probes signals by 120 times.

C2 memorizes the "cal" level, and IC1/B is a sample&hold buffer

IC1/C compares the two signals from A and B and lights the leds accordingly.

IC1/D is a variable oscillator from the result of IC1/C

IC2/A is a one minute delay to switch-off the system if not in use