ADDAC System ADDAC711 Bruksanvisning

ADDAC System Inte kategoriserad ADDAC711

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Instruments for Sonic Expression
Est.2009
August.2022
USER’S GUIDE . REV01
ADDAC711
BALANCED
INPUTS
INTRODUCING
From Portugal with Love!
ADDAC711 BALANCED INPUTS USER’S GUIDE
August.2022Revision.01
Welcome to:
page 2ADDAC SYSTEM
DESCRIPTION
ADDAC711 is a dual channel Isolated DI box and is all
about keeping the sound coming into your Modular free
from any undesired noisy interferences, making sure that
what you’re getting from your inputs is what your exter-
nal hardware is actually producing. It provides galvanic
electrical isolation between the Modular system and
external sources preventing impedance mismatch and
ground loop induced hum.
ADDAC’s 711 circuit is designed around a unity 1:1 type
Low-cost Audio Transformer operating in the 20 Hz to 20
KHz range, this impedance matching transformer provides
two fully balanced outputs (via XLR connectors).
There are two independent channels on the module with:
Audio Output
Signal overload warning led
LIFT/FLOAT/GND toggle switch
Gain control
XLR Input
The LIFT/FLOAT/GND 3-way switch lets you choose
between lift, ground or floating ground.
In the LIFT position (left) the module circuit will be
“lifted” to ground through a 100R resistor and a 10nF
capacitor.
In the FLOAT position (middle) Ground will not be shared
leaving ins and outs grounds completely apart from each
other fully isolating both signals.
in the GND position (right) Ground will be shared between
inputs and outputs, here no isolation is used.
Any of these three positions may be the best form of
avoiding ground loops or any other undesired interference
occurring between your modular and the external hard-
ware. Try out which one of these options will work best
in any given situation.
This module will also be available as a full DIY kit.. Tech Specs:
6HP
4 cm deep
40mA +12V
40mA -12V
ADDAC711 User’s Guide
page 3ADDAC SYSTEM
TRANSFORMER FREQUENCY RESPONSE
20 Hz 50 Hz 100 Hz 20KHz10KHz1000 Hz
-0.5 dB
0.0 dB
0.5 dB
DESCRIPTION
The importance of using Audio Transformers
Applying a transformer balanced input isolation has lots of advantages over other less expensive ways
for dealing with ground loop issues. This method provides the chance to set a very simple and clean
circuit in which the signal transfer process develops smoothly and humming free. The transformer is a
device that performs both signal balancing and high-to-low (or vice-versa) impedance conversion, while
rejecting straggled DC voltage and Radio Frequency Interference from signal passing through a magnetic
bridge. In a transformer, two (or more) coils (called windings) of insulated wire wound around a magnet-
ic metal core allow for its input(s) and output(s) not to be physically connected together. When an AC
signal passes through the input winding (the primary), a perfectly related AC signal appears on the
output winding (the secondary). This way, by the fact that signal flows via inductive coupling between
the two windings of the transformer, this module presents a most accurate electrical isolation between
its input and output. A same number of windings on each coil guarantees that there’s no gain loss when
audio signal passes from the primary to the secondary windings. Furthermore, since these two windings
are insulated from each other, the transformer will electrically isolate ADDAC711 from any other device,
preventing hum problems coming from an outsider ground.
Being a low-cost transformer the frequency response curve is not completely linear, still the -0.2dB
attenuation at 50Hz feels negligible.

Produktspecifikationer

Varumärke: ADDAC System
Kategori: Inte kategoriserad
Modell: ADDAC711

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