General Technical Description; Installation - Lectrosonics DA4 Operating Instructions Manual

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Table Of Contents

Table of Contents

The DA4 provides an electronically balanced and RF filtered, XLR type input, and four electronically balanced and

floating, RF filtered outputs. In addition, a Through output is provided to allow the input signal to be passed through

the DA4 on to other modules.

The input stage is a unity gain differential amplifier. This stage drives the four level controls. After the level

controls, each output signal is sent to an amplifier stage with 20dB of gain. When the signals have been amplified,

they are then passed to the output drivers. The output drivers can provide ample current to drive loads as low as

600 ohms to +20dBv levels. These drivers are electronically balanced and floating, as well as RF filtered. They

provide most of the advantages of transformer coupled circuits, without the low frequency non-linearities associated

with transformers. Should transformers be desired, however, they are available as options.

RFI

BALANCED

INPUT

FILTER

THROUGH

OUTPUT

The DA4 module is installed from the rear of the Modular Audio Processor mainframe. The printed circuit board

can fit into any of the ten slots provided for Modular Audio Processor modules. Once the module is fit into the card

guides for the slot, it may be slid forward in the mainframe until the female edge connector seats firmly onto the

male pins of the main bus board.

Care should be taken when inserting the edge connector onto the pins to be sure there is correct alignment.

Four #2 machine screws with captive washers are provided to secure the rear panel of the LM3 to the top and

bottom rear rails of the Modular Audio Processor mainframe. Four #2 flat head screws are provided to secure the

front panel of the LM3 to the front panel of the Modular Audio Processor mainframe. Once these eight screws are

in place, the installation of this module is complete.