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Introduction
Hardware Overview
ADHB-4 Mainboard
The Mainboard contains two (2) main sections, the digital control board and the audio control board.
Digital Control Board
The Digital Control board consists of a Texas Instruments processor. It provides interfaces for USB 2.0, 10/100 Ethernet, and
an audio serial port.
Keypad Board
The Keypad Board supplies the interface and mounting surface for the graphic display, membrane keys, and the power/PTT
LED.
XLR Connector Board
The Connector Board allows an XLR microphone connection to the side of the unit. The board supplies a red LED, visible
from the side panel, to indicate phantom power to the microphone is on.
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