LM393 comparator witch Isteresis....problem

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buddace

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Hello, this is schematic of loconet tranceiver (one wire serial line) (I add 1k pullup resistor)
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I have problem whit lm393...it don't work correctly...some times. With high input out is Low....
 

LM393 has an open collector output, not visible on your schematic. Unless present outside, this is not correct.
 

There is 1k pullup between pin1 and vcc (not in schematic)
 

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