Imagine I have a pulse train input which goes into a Schmitt trigger for getting sharpened. Imagine the HIGH of the input pulse train is around 8V and LOW is around zero volt.
So what should one select the lower and upper threshold voltages in this case? Does that depend on the desired HIGH output voltage? And what is the logic behind determining these threshold levels?
I found this calculator which one needs to decide about the low and high tresholds: http://www.random-science-tools.com/electronics/schmitt-trigger-calculator.htm