How about a diode to isolate the processor suppy and some "bulk" capacitance on the processor side to supply power when the main drops out. Or buck-boost switching regulator to power the processor may be another solution.
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How about a diode to isolate the processor suppy and some "bulk" capacitance on the processor side to supply power when the main drops out. Or buck-boost switching regulator to power the processor may be another solution.