Fairchild DA415/8 Instruction Manual
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FAIRCHILD
DISTRIBUTION
AMPLIFIER
-
MODEL
DA415/8
IBDA415/8-171
INSTRUCTION
MANUAL
-
CHILD
SOUND
EQUIPMENT
CORPORATION
, 10-40 45th Avenue, Long Island City, N.Y. 11101, 212 784-6163
www.SteamPoweredRadio.Com
-
www.SteamPoweredRadio.Com
-
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FAIRCHILD
DA415/8 DISTRIBUTION
AMPLIFIER
GENERAL
The
MODEL
DA415/8
Distribution
Amplifier
,
is
designed
to
provide
a means
of
sending
signals
from
one
or
more
sources
into
8
separate
lines
with
minimum amount
of
interaction
between
channels,
minimum
distortion
of
the
distributed
signal
and
flat
frequency
response.
The DA415-8
consists
of
8
separate
isolation
amplifiers.
Input
and
output
of
each
amplifier
is
accessible
individually
through
a
24
pin
blue
ribbon
connector
in
the
back
of
the
chassis.
This
provides
for
a
variety
of
interconnections
that
can
be
made
with
the
8
isolation
amplifiers.
High
in-
put
impedance
of
each
amplifier
allows
connection
to
high
impedance
sources.
A
self-contained
power
supply
(692PS.24)
excludes
the
use
of
any
audio
transformers
inside
the
amplifier
enclosure
since
hum
fields
emanating
from
the
power
transformers
could
be
picked
up
by
the
best
shielded
audio
transformers.
The DA415/8
output
circuits
are
designed
to
be
used
with
reactive
loads
driving
conventional
600
ohm
lines.
Maximum
output
handling
capability
of
each
amplifier
is
designed
to
match
the
performance
of
the
transformers
normally
used
in
transmission
lines,
as
well
as
power
limitations
of
telephone
lines.
Unity
voltage
gain
of
the
DA415/8
enables
dire
ct
connections
of
the
input
to
high
level
sources
such
as
console
outputs,
outputs
of
tape
machines,
mixers
or
telephone
lines.
Circuit
of
the
amplifiers
in
the
DA415/8
is
a
Class
A
emitter
follower.
Input
impedance
at
the
first
stage
is
lOOK
ohms. The
output
stage
has
very
low
output
impedance
designed
to
work
into
resistive
or
inductive
load.
This
output
impedance
is
important
when
feeding
telephone
lines
through
a
transformer
so
that,
in
effect,
the
telco
line
impedance
is
bridging
the
output
of
the
DA415/8
and
chances
of
in
t
eraction
of
two
transformers
is
eliminated
through
a
high
damping
factor
offered
by
the
amplifier
output.
This
eliminates
the
need
for
an
isolation
pad
normally
used
with
amplifiers
having
a
low
damping
effect
(matching
output
impedance).
The
power
supply
driving
the
DA415/8
is
packaged
on a
separate
plug-in
card,
capable
of
delivering
,.
the
needed
power
to
drive
all
8
amplifiers.
Its
active
filter
and
voltage
regulator
circuits
feature
overload
and
short
circuit
protection
as
well
as
very
low
ripple
voltage,
important
for
good
signal-to-noise
ratio.
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