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A diode-OR circuit is used in electronics to isolate two or more voltage sources. There are two typical implementations:
When a DC supply voltage needs to be generated from one of a number of different sources, for example when terminating a parallel SCSI bus, a very simple circuit like this can be used:
In digital electronics a diode-OR circuit is used to derive a simple Boolean logic function. This kind of circuit was once very common in Diode-transistor logic but has been largely replaced by CMOS in modern electronics:
References
Diode-or circuit Wikipedia(Text) CC BY-SA