Sergegsx:
With voltages varying so much, I am having problems choosing the components. Either they use too much power, or the resistors do not suit to all cases.Please could you suggest another method ? Anyone else?
You need to state your requirements better. You have said that you want to detect the difference between (1) 60 to 80V, and (b) 0V. Anything else? e.g. do you require a particular behaviour when there is more than 0V but less than 60V? Do you need to allow for more than 80V input, if so what is the maximum voltage? And what is an acceptable power consumption at 80V input?