ATI Technologies DMA103 운영 및 유지보수 매뉴얼 - 페이지 2

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DESCRIPTION

Your DA103 and DMA103 Audio Distribution Amplifiers are inexpensive high

performance amplifiers designed to split and isolate audio signal lines.

The DA103 accepts a line level input, balanced or unbalanced audio at –20, -10

or +4dBu nominal and provides a line level output at +4dBm nominal level to

balanced or unbalanced output lines. The DA103 input/output connectors are two

piece solderless "Phoenix" types, individual for each input and output line.

The DMA103 accepts a microphone level input signal and provides either line

or microphone level outputs to drive balanced or unbalanced lines. Phantom

microphone power is provided and all audio connections are made using XLR

type connectors.

CIRCUIT DETAILS

The DA103 accepts a maximum line input level of +22dBu to high impedance

(20Kohms) balanced instrumentation amplifier input (A1) and drives three servo

balanced 600-ohm (minimum load) outputs (A3, A4, A5) up to +22dBm

maximum. An internal input gain setting jumper plug optimizes the input stage

gain, noise and headroom for nominal inputs at -20, -10 or +4dBu. The Master

Gain control (R14a) adjusts all outputs simultaneously to compensate for input

signal changes while individual output trimmers accommodate differing nominal

output level requirements from -10dBu to +8dBm. Up to 40dB maximum gain is

available. The servo-balanced outputs automatically detect single-ended (one

side grounded) loads; remove the drive signal from the grounded output and

double the signal applied to the ungrounded output thus maintaining equal gain

for both types of loading.

The DMA103 boosts a microphone level input up to line level with up to 80dB

gain. A low noise transformerless input stage (A1) allows internal DIPswitch (S1)

selection of input gain from 10, 20, 40 or 60dB to optimally match low or high

output microphones. A Master Gain control is provided and individual front

trimmers match differing output level requirements from –10 to +8dBm. Phantom

microphone power at regulated +20.2 VDC from A10 is selected with an internal

DIPswitch and is sufficient for most powered microphones. +48VDC phantom

power is also available as a plug-in option (PH48-1), consult factory. Three

servo-balanced output drivers drive balanced or one side grounded loads and

individual jumper plug 54dB output attenuators (P1, P2, P3) provide –50dBm

microphone level outputs if necessary.

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