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→Options #2: bestcap
==Options #2: bestcap==
Second option use a Bestcap and a resistor/diode circuit for the charge. Resistor R12 limit the maximum charge current and D2 isolate the Bestcap when the Main PSU fails.
''Suggested part number for Bestcap: AVX BZ015A104ZS''
==Options #3: NiMH/NiCd battery==
==Options #4: Li-ion/Li-Po battery==
==Schematics==
http://www.dave.eu/download/restricted/ssd/dul/DUL-EVB-0.9.1.pdf