Lm393 question

172

05:10:43

Is it possible to use lm393 to compare voltage from 2 different power supply. When I did this circuit in real life it does not work the led  not turned on. Can you tell me why.. 

published 6 years ago

hurz

6 years ago

LM393 is a comparator with open collector output! You need to connect the LED to a supply and swap the inputs to make it from its logic LOW active, then it should work, but keep the current below 10mA or better 5mA

hurz

6 years ago

here the example http://everycircuit.com/circuit/5502762159439872

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