frequency conversion circuit composed of LM331


Posted on Feb 6, 2014

LM331 is the single voltage / frequency conversion IC within 1.9 v reference voltage, current switch, comparator and flip-flop, etc. In order to expand the range, the circuit is added A1 op amp. The reference current IR is decided by (Rl + R (RPl)), as the internal reference voltage is 1.9 V, IR = l · 9V / (Rl + R (RPl)), the usual range is 100 to 500?A. I..


frequency conversion circuit composed of LM331
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