Liivatera 5-Channel Attenuverter & Offset with Mixer User manual

5-Channel Attenuverter &
Offset with Mixer
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Liivatera OÜ
Rävala pst. 8, A211
10143 Tallinn
Harjumaa
Estonia
T: [phone]
T: [phone]
E: [email protected]!

Contents!
Introduction*.........................................................................*3!
Attenuverter!with!Offset.!................................................................................!3!
Mixer.!.......................................................................................................................!3!
Key!Data!.................................................................................................................!3!
Installing*The*Module*...........................................................*4!
Connecting!Power!..............................................................................................!4!
Getting*Started*.....................................................................*5!
Attenuverter!Function!.....................................................................................!5!
Mixer!Function!....................................................................................................!6!
Calibration*...........................................................................*7!
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Introduction*
Attenuverter*with*Offset.**
This module contains five identical independent channels to modify
an audio or control signal. The input signal can be continuously
scaled from +1 (buffered) to -1 (inverted) and a fixed offset added. An
LED indicates the polarity and level of the output signal, green for
positive and red for negative.
If a jack isn’t plugged into an output the signal is automatically
summed into the next channel down, so the module can function as
several independent mixers.
Mixer.**
The lowest output jack is an equal sum of all the outputs, no matter
which other outputs are used. The final level is adjustable to prevent
clipping.
Key*Data*
Module Depth:
30mm
Power Connector:
Doepfer 10-pin shrouded
header
Current
Consumption:
+12 Volts, 35mA
-12 Volts, 35mA
Reverse-Power
Protection:
Yes
Panel Width:
16HP (81.2mm)

Installing*The*Module*
Connecting*Power*
The module is supplied with a 12-inch ribbon-cable to connect it to
the power distribution bus in your cabinet. The keyed socket on the
module ensures that the cable can only be installed one way, with the
red stripe of the cable towards the bottom of the module. The 16-way
plug on the far end of the cable should be orientated with the red
stripe on the cable connecting to the -12-Volt pins on the distribution
board.
It is advisable to power the module briefly before fixing it in the
cabinet to confirm that the cable is fitted correctly. When doing this
ensure that the module is not placed on a conducting surface. The
internal protection circuits will prevent any damage to the module
should the cable be connected incorrectly.
Fitting*the*Module*in*the*Rack*
The module is supplied with four M3 bolts and two transparent nylon
washers. Place the module in the rack and, if you are using threaded
guide-rails, align the mounting holes in the front-panel with the
holes in the rails. Place the nylon washers on the bolts, and screw the
bolts into the rail. The washers will prevent marking on the panel
from the bolts, but don’t over-tighten them as this will make
removing the module at a later date more difficult.
-12 Volts
+12 Volts
GND

Getting*Started*
Please refer to the ‘Installing Your Module’ section before
progressing to this chapter.
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The module is split into two circuits that can either work
independently or together. Signal inputs are on the left side of the
module, manual modifiers are in the centre, and outputs on the right.
Attenuverter*Function
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Input
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D.C. Coupled signal input. Input impedance is
100k.
Level!
Adjusts the signal gain from +1 to -1.
Offset
Adds a 0-5-volt DC offset to the In signal.
Output
Low output impedance (<1 Ohm).
This output is the
sum of the 5
outputs
Each Output is
scaled by the
‘Level’ control
and offset by the
‘Offset’ control
If a jack isn’t
plugged Into the
Output, it is
summed into the
next Output
down
5 Independent
Inputs

Mixer*Function
If a jack isn’t plugged into an Output socket the signal is fed into the
output buffer of the next stage down. This continues until a jack is
inserted, so it is possible to create a 1-5 channel mixer, 2 2-channel
mixers, 1 2-channel and 1 3-channel mixer etc.
A sixth output is a dedicated sum of the 5 output channels, with a
level control to prevent the output clipping.!

Calibration*
There is no calibration required for this module
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