4/26/2023 0 Comments Voltage comparator lm339 proteusNote that the voltage level for both the positive and negative output voltages will be about 1 V less than the power supply. The output voltage depends on the value of the input voltage relative to the reference voltage, as follows: Input Voltage In the voltage-comparator circuit, first a reference voltage is applied to the inverting input (V –) then the voltage to be compared with the reference voltage is applied to the noninverting input. You can use a voltage comparator to compare the voltage from the photocell with a 0.5 V reference voltage to determine whether or not the sun is shining. Suppose that you have a photocell that generates 0.5 V when it’s exposed to full sunlight, and you want to use this photocell as a sensor to determine when it’s daylight. The LM311 comparator can have other output arrangements as it has both an open collector and open emitter on the output transistor. It’s easy to create a voltage comparator from an op amp, because the polarity of the op-amp’s output circuit depends on the polarity of the difference between the two input voltages.Ĭomparators with Open Collector outputs such as the LM339 or LM393 must be configured so the both outputs are HIGH when the voltage is within the desired limits. A voltage comparator is an electronic circuit that compares two input voltages and lets you know which of the two is greater.
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