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Neumann-Information
11
&ly 1989
Operating
two microphones
of the k@~beries
(e.g. two TLM 170 or
an RSM 190/191) with the Stereo-Nagra
IV
Microphones
of the k@or
S eries are operated with P 48 Phantom powering, 2 mA.
Upon switching on, the current drain may be momentarily
higher, especially with the RSM 190/191
shotgun stereo microphone
System.
When such microphones
are connected
to the Stereo-Nagra
IV, it may occur that they do not function
correctly or even at all; in some cases, oscillation is also apparent.
The power supply in this unit is of a very low Order, and the control circuit in the microphone
tries to obtain
the necessary operating
current despite a possible breakdown
of the supply voltage.
have now come up with a circuit modification
with which the current supply to mi-
Dr series is assured.
This modification
tan also be easily carried out in the field on exlsting units by changlng the two resistors
R 15 and Ff 16 shown in the Sketch from 10 ohms to 6.8 Ohms.
Resistors
to be exchanged
Position
of power supply module
CHARLOTTENSTRASSE
3
D-l000
BERLIN 61
POSTFACH
610469
TELEGRAMM:
NEUMANNACUSTIC
TELEFON: (030) 25993-0
TELEFAX:
(030) 25993-108
TELEX: 184595
NEUAK D
Printed in Ge1
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