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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)
View image: lm393.png
I have problem whit lm393...it don't work correctly...some times. With high input out is Low....
 

helios31

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

buddace

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

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