555 8 feet is the integrated circuit voltage input, the voltage is 5 ~ 18V, said UCC; seen from the voltage divider, the comparator 6 feet A1 5 feet connected between R1 and R2, so 5 feet The voltage is fixed at 2UCC / 3; the next comparator A2 is connected between R2 and R3, the non-inverting input potential of A2 is fixed on UCC / 3.
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