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==Introduction==
The concept schematic here described provides some hints about possible implementations of backup power supply for [[LCC USB SSD (DUL)|DUL]] module.T
Four different options are shown, based on capacitors or battery. These are briefly described in the following sections.
J19 is reference of LCC-68 socket where DUL can be plugged. MOD1 is reference of DUL module when soldered on PCB directly. R25, R26, R28 and R31 allow to connect USB bus to socket or soldered-down DUL module.
DL5, DL6, DL7 and DL8 are staus LEDs connected rispectively respectively to the following signals of DUL:
* STAT2#
* WARN#