Litton Systems, Inc.

James G Winkel

David W Buck

Michael D Waterman

Terry D Morris

David A Crosby

A transportable power source (P) for an image viewing device (D) includes a battery pack housing assembly ( ) to internally hold a first battery pack ( ). An electrical interface circuit ( ) receives an input voltage level ( ) and provides a resulting output voltage level ( ) as an output therefrom to operate the viewer device (D). The interface circuit ( ) receives a selected first input voltage level ( ) from the first battery pack ( ). Alternatively, the interface circuit ( ) receives a selected second input voltage level ( ) from a power supply source (S) external to the battery pack housing ( ). The interface circuit ( ) further includes a switch ( ) for selecting between sources of input voltage levels from among at least the first input voltage level ( ) and the second input voltage level ( ). The switch ( ) also selectively controls the source for the resulting output voltage level ( ).

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Rockwall, TX, United States of America

James G Winkel