Bose l1 compact system theory of operation
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Page 1
2 General This document refers to schematic revision 01 for both the I/O Board and PS & Amp board. The L1 ® Compact comprises a Power Stand base unit that houses input and output connectors and all electronics, a removable Twiddler TM Array, and two extension sections used to raise the Twiddler Array to ear level when standing. The electronics in the base are on two circuit boards: an I/O Board directly beneath the top cover, and the PS & Amp Board which is mounted vertically on the back wall of the enclosure. I/O Connectors - AC mains input- IEC connector XRL Microphone Input Jack 1/8" Stereo Input Jack Two RCA Input Jacks ¼ Balanced Input Jack ¼ Line Out Jack Two RCA Line Out Jacks Controls - Power Switch - Switches the system on and off Mic Volume - Adjusts the Audio Output Level from the Microphone Input Mic Treble - Adjusts the Treble for the Microphone Audio Output Mic Bass - Adjusts the Bass for the Microphone Audio Output Channel 2 Volume - Adjusts the Audio Output Level from the Channel 2 Inputs: - 1/8" Jack, RCA Jacks, or ¼ Jack. Indicators Power Indicator - Indicates power status: Blue = system on. Signal/Clip Indicator - Ch1 (Mic) and Ch2 - Indicates the level of the Audio Output: - Green = Normal. Red = Over Maximum Audio Level. Power Supply The L1 Compact Power supply is a Flyback switching supply based on Power Integrations TOP258 which provides Under voltage, Over voltage, and Thermal Protection internally. This produces four regulated DC Power Rails from the secondary: +28V and -28V for the ampli- fier (Philips / NXP TDA8920BTH) and +18V and -18V which are provided to the I/O board over the 10 pin ribbon cable. These +/-18V rails are post regulated on the I/O board to +/-15V by U315 & U316. Diagrams – Pages 3 to 6 L1 Compact Block Diagram L1 Compact PCB Layout L1 Compact I/O Board L1 Compact Channel 1 Input Section L1 Compact Channel 2 Input Section L1 Compact - Theory of Operation
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3 L1 Compact Power Stand Block Diagram L1 Compact - Theory of Operation