Neumann-Information 1841
Operation of NEUMANN fet 80R(i) microphones in conjunction with unbalanced or Center tap grounded inputs
The
microphones of
48
Vdt
according to IEC 268-15A/DIN 45, 596.
In
Phantom
-weil as the modulation leaving the power supply
potential of +48 Vdt.
console inputs this is of no consequence.
microphones
grounded,
powering
are
the
powering voltage is shorted
the fet 80 R
both modulation
For
professional balanced and floating
connected to inputs
(i) series are
conductors
of the
are at the powering voltage
However
which
out and no
when such Phantom
have side
Phantom
powered from
microphone cable as
amplifiers and
or the Center
Operation
is possible.
NOV.
powered
I 984
tap
For Center tap grounded
NAGRA
nected without causing any negative
For
there are
1.
recorders),
connection af NEUMANN fet 80 R
the following possibilities:
Microphone
into unbalanced
transformer (1
the modulation
and
this
power
:l
line.
equipment with an input
Center
supply may be
or Center
turns ratio)
Since there are numerous
transformer
A specific
and at additional
The maximum input Signal
frequency range is
- MICROPHONE
(150.. 250a.h)
is supplied with stripped and tinned
connector will
price.
capability
30...16,000
Bu 1
INTERNATIONAL
tap
ground tan virtually always
operational results.
microphones to
operated
tap
grounded inputs, if a
of the AT 8/1
types of
be attached
Hz.
5u 1 +--20cm
DIN
microphone
to the secondary
of the AT 8/1 (i) is 300 mV at 40 Hz;
Fig.
PRIMARV
1
4 b--
transformer
unbalanced inputs,
without any
(i)
type is
input
secondary leads only.
30cm
SEKUNDARV
i
(e.g.some NAGRA
be
discon-
alterations
high quality
inserted
connectors,
on
special Order
---+
even
cable
into
this
.
GN7
Bu 1
;NTEANATIONAL
ty$ AT811 i
Bu 1
DIN
0
Soldering side vietq
Fiq. 1
CHARLOTTENSTRASSE 3 . D-l000 BERLIN 61 I POSTFACH 610469 . TELEGRAMM: NEUMANNACUSTIC
TELEFON: (030) 25993-0 . TELEFAX: (030) 25993-108 . TELEX: 184595 NEUAK D
Printed in Germany
2. Microphone and power supply may be converted to unbalanced
the field
microphone is to be used exclusively with unbalanced inputs such as
semi-professional
through a minor
or
home equipment. Fig. 2...5
alteration.
This Change is
recommebded if the
Operation
in
Fiq* 2
Standard, balanced
configuration
1
Switchcraft
A3M
.-
t-
of Neumann
Switchcroft
A3M I DIN L 152t)
f-*-
(DIN L152t 1
microphone Outputs.
1. Wire heretofore
(now modulation alone).
2. Wire heretofore
without removing the
3. Remove the Phantom
4.
Move the
to pin 3.
The
circuit
wire previously
then
Fiq. 3
connected to pin 2
connected to pin 3
wire already
powering resistors
Unbalanced
(+), remains
(-> is to
connected
(2 x 6.8 kohm).
connected to the junction of these
conforms to IEC 268-12.
connections.
be
there.
(2)
connected to pin 2
resoldered
to pin 1
resistors
Far
microphones
Tuchel), the following changes
1.
Wire heretofore soldered to pin 3 (-1 is to
2.
without
Wire
removing
heretofore
equipped with connectors per
are necessary:
the
wire already
connected to pin 1
connected
(+> is to bt-: resoldered to
DIN
41524
be
there.
(Binder,
Mini-
resoldered to pin. 2
pin 3.
3. Remove the Phantom pawering
4. Install a
The
circuit
The
IC 3, IC 4,
Conversion
new
wire
then
corresponds to DIN 45594
KT
of the N 452 i, BS 945 i etc. Power Supplies:
.-
+L8V-
J
from the
1 tiicrophone Cables require
6k8
+4--
6k8
-t:
ov
resistors.
junction
Switchcraft
A3F
1-
T
I
1
x
1
T
i’-
A3M
/
I
.-
#
+
-&=l OV, Schirm
3 ov
.
2 w Modulation
L,-
i
of these
Type L.
Shield
resistors
no changes.
11)
12 1
.
11)
131
(2)
to pin 1.
1. Remove and
2. Remove and
side).
3. Strap
discard
discard
pin 1 and pin
For microphones
applies :
The pin numbers
in this
order
(sec also the schematic
Fig. 4
the 6.8 kohm
the
wire heretofore
3 together
equipped with
of
Figs, 1, 2, 3 correspond
resistor soldered
(output
connectors per
to pin 2.
connected to pin 3 (output
side).
DIN 41524, the following
to the pin numbers 2, 3, 1
supplied
with
your
equipment) .
Audio Modulation cable to the amplifier, tape recorder etc. equipped
with unbalanced input:
i DIN‘L152L 1 Switchcraft
w Modulation
Schirm
Shield
Fig. 5
3. Should the use of a transformer
as recommeded
in example #l not be desi-
rable or the microphone put out’modulation voltages beyond those permissable for the AT 8/‘l (i) transformer, then you may block the 48 Vdt phantom power from your
+L8V- +L8V-
input through the use of blocking capacitors:
( DIN L152L 1
(3)
11)
(2)
;
(3)
-iz3L-dbfF
‘6k8 6k8
6k8 6k8
2x + 2x + ; ;
lOOp163V lOOp163V
1 1
T
T
I
Switchcroft
I I
‘< 2 ‘< 2
. .
Pin numbers in
parentheses refer to microphones equipped with connectors
according to DIN 41524 (Binder or
Errors excepted.
Subject to changes.
Fig. 6
Amphenol-Tuchel).
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