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The circuit as shown is quite meaningless by itself. LED current is adjusted with the 1M pot. The forward drop Vf of the LED changes non-linearly with the LED current. The voltage at pin 6 of the comparator is set by the 5k pot, and that at pin 7 is set by Vf. When Vf is lower than pin 6, the LM339 output goes low. When Vf rises above pin 6, the output goes high.its the same circuit !! nothing new added.