Electret Microphone; Coupling Electronics - Mercedes-Benz Vito Supplement Owner's Manual

Technical data

Electret microphone

Coupling electronics

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