ATI Audio SDA200 운영 및 유지보수 매뉴얼 - 페이지 2

{카테고리_이름} ATI Audio SDA200에 대한 운영 및 유지보수 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. ATI Audio SDA200 6 페이지. Stereo distribution amplifier modules for system 10k

DESCRIPTION

The SDA200 and SMDA200 modules are both two-input and eight-output audio

distribution amplifiers designed as plug-in components for the SYSTEM 10K

Modular Audio Distribution System. The SYSTEM 10K provides proper mounting,

shielding and power for a family of interchangeable amplifier modules.

Performance to published specifications and operational life of these modules

are covered by ATI's standard warranty on the SYSTEM 10K only when they are

used as part of a SYSTEM 10K consisting of an RM100 Rack Enclosure and

PS100 Power Supplies.

The SDA200 and SMDA200 modules feature eight active balanced outputs in

two groups of four. Both output groups are controlled together by a single, stereo,

full range, audio taper level control. Individual left and right multi-turn trimmers

provide fine matching adjustment with a limited range of ±4dB.

A board mounted DIP switch selects normal left/right stereo outputs or can select

either the left or the right input to drive all eight outputs or can even be used to

sum both left and right (L+R) inputs into either or both sets of outputs. By

reversing the phase of the right input signal on the external connector, an L-R

difference signal can be generated in the same manner.

A TRS (tip-ring-shield) stereo headphone output jack is mounted on the front

panel. Both low and high impedance stereo headphones will be driven properly

without output loading.

The SMDA200 incorporates an LED peak-indicating bargraph meter which is

switchable to either the inputs or the outputs and will monitor either the Left

Channel, the Right Channel or the Left plus Right (L+R) Sum signal as selected

by a pair of front panel switches.

CIRCUIT OPERATION

The audio input lines are bridged by a 30,000 ohm active balanced differential

input stage with a loss of 2.5dB. The bridging resistor network is split and heavily

bypassed for maximum RF protection. Trimmers R13 and R14 null out common

mode hum inputs and are factory set to 90dB. To field-adjust, apply a 60 Hz input

to HI and LO input terminals together referenced to ground and adjust the

trimmer to null the output. The input stage will bridge a +24dBm input line without

clipping. The input stages use two sections of a quad bi-fet LF347N IC.

A full range, ganged stereo OUTPUT control, R23 and R24, adjusts both

channels simultaneously; unity channel gain is at 50 percent rotation. Individual

multi-turn trimpots, R17 and R18, allow fine TRIM and precise matching of each

ATI Audio Inc.

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Fax: 856-504-0220

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