Mercedes-Benz Viano Taxi, Supplement Owner'S Manual

Page: 55 / 63

52
Technical data
Electret microphone
4
The illustrated circuit diagram (example)
shows you how the electret microphone is
adapted to a two-way radio.
For example:
Decoupling capacitor C=10
µ
F
Coupling resistance R
L
= 680
Ω
(if U
B
= 8 V and I
max
= 6 mA)
To calculate coupling resistance R
L
for
other supply voltages:
R
L
=U
B
/I
max
(with I
max
=6 mA)
For U
B
you must refer to the technical data
for your two-way radio.
Coupling electronics
!
Have the coupling electronics for con-
necting an electret microphone to a
two-way radio prepared by authorised
radio installation specialists.