Clever Little Box LCU1A User Instructions

LCU1A

Level Converter Unit

User Instructions

Please note: Issue 5 of this unit is now fitted with a DC blocking capacitor

making it suitable for use on systems that use DC monitoring.

This does not affect its use on conventional PA systems.

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Introduction:

The LCU1A offers a cost effective means of reducing either 70v or 100v signals
to either line or microphone level signals for use as an input to additional amplifiers
in a system, The LCU1A is comprised of a 70/100v transformer with two secondary
windings each coupled to variable resistive attenuators enabling the unit to supply
two line level and two microphone level signals from a single 70/100v signal source.

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Technical Specifications:

Specifications:

Input signal level: 100v (rms) max, balanced

Output signal level (Line 1): 0 ~ 1v (rms), balanced

Output signal level (Line 2): 0 ~ 1v (rms), balanced

Output signal level (Mic 1): 0 ~ 10mv (rms), balanced

Output signal level (Mic 2): 0 ~ 10mv (rms), balanced

Weight: 1kg (approximately)

• CIE Group LTD reserves the right to alter the above specifications without prior notice

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Connection Details:

All connections are via knock out
holes on the sides of the box and onto
screw terminals located on the printed
circuit board.

• Caution:

When using the mic level outputs it is
recommended that the screen chassis
links be left in place to reduce the
possibility of hum pickup. However, care
must be taken when using both mic
level outputs to separate amplifiers not
to create earth loops within the system.
To prevent this from happening it may
be necessary to remove just one of the
screen chassis links and leave the other
intact.

Terminal Block Designation Description

TB1 C 70/100v signal common

70v 70v line signal input
100v 100v signal input

TB2 LINE 1 - Line level signal output -
LINE 1 + Line level signal output +

TB3 GND Ground connection for mic 1 output
MIC 1 Mic level signal output ­ MIC 1 + Mic level signal output +

TB4 LINE 2 - Line level signal output -
LINE 2 + Line level signal output +

TB5 GND Ground connection for mic 2 output
MIC 2 - Mic level signal output ­ MIC 2 + Mic level signal output +

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Notes:

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Notes:

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CIE-Group Ltd Widdowson Close Blenheim Ind Est Bulwell Nottingham NG6 8WB England

Registered in England No. 2761780