differences at output on and off

[sp]

hai

i am using LM393 as output ON and OFF

It is showing ,the output will be ON at 12.2V input voltage and the
output will OFF at 10.9V input voltage at normal room temperature

At AC room temperature the ON and OFF voltages like 12.5V and 11.3V

Can anybody tell me what is the problem , why it is behave like this


Thank u

 

[neon]

i wander if you have any pull ups on the output? and do you bother to put some hysterisis.