RB comparator - Lm339 - 2
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Comparator to turn on LED when input voltage is > V_low_ref and < V_high_ref.
V_low_ref is 3.0 V, set by R1 and R2
V_high_ref is 4.0 V, set by R4 and R5
LM339 has open collector output so can sink LED current.
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mp108
32 Circuits
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