Fig 9 Speaker - Nokia NSB-7 Series Service Manual

NSB-7
UI Module
Speaker
Speaker circuit includes pads for speaker and 2 capacitors, 2 ferrites for EMC protection.
The speaker is sealed to the A-cover with gasket and UI PCB with supporting light guide.
With that the frequency response is more constant. The speaker does not need holes for
PCB. This gives reliable sound quality for the phone and it can be estimated in several
environments. Arrangement is a leak tolerant speaker.
The low impedance, dynamic type earphone is connected to a differential output in the
COBBA audio codec. The electrical specifications for the earphone output are shown
below. The voltage level at each output is given as reference to ground. Earphone levels
are given to 32 ohm load.
COBBA output, differential, 6dB
gain
Earpiece sound pressure (sensitivity
+28dBPa/V 1kHz)
Page 16
Nominal Maximum
17.6mV 788mV
-7dBPa +26dBPa
Figure 9: Speaker
ãNokia Mobile Phones Ltd.
PAMS Technical Documentation
Notes
ENGINE - UI Interface; Estimate,
must be checked with final ear-
piece construction
Measured as shielded (in brackets
with leak ring)
Issue 1 06/00