Audio International, Inc. AI-LDC, AI-LDC1, AI-LDC2 Installation
Document # 540044, Rev. A, 11/2000 Page 4 of 12
1.4 Optional Equipment
Audio International, Inc. offers a comprehensive family of Cabin Control
Modules. These modules provide convenient solutions for a variety of
frequently encountered interfacing needs or special requirements and are
an important part of AI’s “building block”system for configuring total cabin
management.
Contact your AI representative for details.
2.0 Application
2.1 Introduction
The AI-LDC is a stereo pre-amplifier designed for input level matching and
amplification. This audio component is built to rugged aircraft standards
and is easily incorporated into new or existing cabin audio systems. The
unit is useful for eliminating ground loop noise, common mode noise, and
increasing signal-to-noise ratios. The AI-LDC contains source level
matching, balance and amplification, differential input, and a small case
for ease in mounting.
The AI-LDC1 is identical to the AI-LDC with the added feature of remote
volume control with LED output. This feature is useful for providing
volume control to fixed level audio sources. A bar graph driver is provided
for volume level presentations. The correlation between the volume
setting and the bar graph driver is factory set but may be adjusted by the
customer. Two (2) methods of volume control are available. However,
only one (1) method may be used at one (1) time.
• Discrete, momentary ground inputs may be used to increase or
decrease the output level. Simply apply a ground to the volume up
or down input for the desired action.
• For potentiometer control, a voltage from 0 to +28 VDC will vary the
output proportionally. A 0 VDC input will correspond to minimum
output and a +28 VDC input will correspond to the maximum
output. A 10 k-ohm (0.5 watt) linear potentiometer is
recommended.
• Power up is at minimum volume.
The AI-LDC2 is two (2) AI-LDC units incorporated into one (1) compact
housing. This feature adds dual stereo preamplifier capability for use with
two (2) stereo sources. .
