i have 10 DC OK galvanic isolated signals and need to AND them into one signal.
if i connect outputs of 10 optocoupler in series and than detect by comparator when all of it is on, is it good shem?
Diode logic can be used as long as your range of voltage is such that one low vote affects the resultant signal causing it to be pulled low.
It can be done with 10 diodes and one pullup resistor.