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POWER SOURCES AND OPERATION
Preparation
Attach the
microphone
to
the microhone stand
BATTERY OPERATION
Q
Open
the
rear
cover by pushing the
two
latches.
€)
Pull
out of
the compartment and insert a battery
into it'
Observe
the
battery
polarity
indicated on the compartment'
Battery
cover
Battery compartment
o
G)
Close
the
compartment by pressing
the
rear
cover.
@
Connect the
output
connector
of
the microphone and
the
input
of the
microphone mixer etc.
with the
microphone cable'
@
Wnen using
the
microphone, set
the
battery
ON/OFF
switch
to
ON.
The directivity indicator
will
illuminate.
After using
the
microphone,
remember
to
set
the switch to
OFF'
Notes
a An
exhausted
battery
causes
noise
or
harmonic
distortiln
When
the
directivity indicator lights
dimly
replace
the
batter!'!"
tn
a fresh
one.
a
lf
the
microphone
is not
to
be used
for
a
long
time,
or
is
operated
on an
external
powr
supply, remove
the
battery
to
avoid
any
possibility of
corrosion.
o
ln
case
of
battery
leakage, wipe
off
any
deposit in the
battery
compartment before
installing
a new battery.
EXTERNAL POWER
SUPPLY
(D
Connect the
output
connector
of the
microphone and
the
input
of
the
external
power
supply (optional
Sony AC'148F or
equivalent)'
€)
Connect
the
output
of the
external
power
supply
and
the input of
the microphone mixer
etc.
c-48
xLB-3-11C
xLR:3-12C
External power supply
XLR-3-11G
MicroPhone
mixer
etc.
To an AC
outlet
effi*
Note
When using
the
microphone
with
the external power supply,
if
the
battery
ON/OFF
switch
is set
to
ON,
current
will
be
drawn from the
battery.
To avoid
running
down
the battery,
keep the
switch
at OFF'
4
TECHNICAL INFORMATION
External power
suPPlY
system
The
C-48
can utilize
an
external
power supply.
This
system uses an external
DC
power source,
a
standard
two"
conductor shielded microphone cable, and the transformer
of
the
C-48.
The
external
power
supply
Sony
AC-148F
(optional)
is recom-
mended
for
this
purpose.
ln
this
form
of
powering, the supply current (positive potential)
is
fed to the center'tap
of
the
power
supply transformer. and is con'
ducted symmetrically
via the
"a"
and
"b"
conductors
whose
original
f
unction
is
to carry the microphone
output
signal. After
this
current
loins at
the center
of
the resistor connected
between the
conductors,
it
tlows from
that
junction
to
the
m
crophone.
The
return current
(negative
potential)
llows
through the shield.
While
the phantom powering
DC
current
is
conducted
via
the audio signal
wires
of
the microphone, there is
no adverse
effect on the
signal,
since no
DC
voltage
difference exists
between the
"a"
and
"b"
con'
d
uctors.
Th
s
3cn/ering
svstem
ls also
usab
e v/'i' ::-:'
'.
ces
of
- -'.:-.'::
-:.---:
:-
: -.
- : :l
'''^:"
^:
:'
Je
ca-.ea:al '.: z''
a'-^a'
.":= -' - :-::':ne
such
as
::'::'rseT.
dynarc. c'.ccc-.
",:-:-:
:ausing noise, inter'i':-:=
or
datd.
^.:'..
- _: rn.
< _-:
Note
with
an external power supply system,
never use
an
unbalanced
microphone cable
f
or connecting to the
microphone.
Cable
a
AC.1
48F
Output
Shield
Power supply
transformer
Sound
wave
+
DC
power source
Output transformer
I
I
I
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