
Telit EVK2 User Guide
1vv0300704 Rev.13- 2012/06/25
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page
36 of 149
9.2.2.
Speaker plus Headset
If you have chosen to connect the Speaker to
HIGH AF POWER
output, without having a
stand-alone electret microphone, it is also possible to connect a standard
off-the-shelf
Headset
to SO401 without any problem, as shown in the figure 18: the AF output signal will
be heard on both Speaker and Earpiece.
WARNING:
You must use the right coil impedance depending from audio output you want to use.
If you sort out the LOW AF POWER solution connecting your Headset to SO401, the coil
impedance
must be at least 16
Ω
@1KHz or higher.
If
you sort out the HIGH AF POWER solution connecting your Speaker to PL401, the coil
impedance
must be at least 8
Ω
@1KHz or higher
Figure 19: Speaker
plus
Headset insertion
spkmic2.skd
Speaker
C
S
11
39
A
STACKED
RS232
USB
RS232
1
40
39
1
AUDIO 2
AUDIO 1
30
29
P
L1
0
Electrete Microphone
Headset
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