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multiple channel "DC OK" signal ANDing with galvanic isolation

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Velkarn

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hi!

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?
 

You could do that.

But Much better (cheaper/smaller) to AND all the signals with a couple multi-input compact gates and then send the result through a single opto.
 

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.
 

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