Nokia 8390 Manuales De Servicio
PAMS Technical Documentation
System Module & UI
NSB-8
Issue 1 01/02
ãNokia Corporation
Page 37
Internal Speaker
The internal earpiece is a dynamic earpiece with an impedance of 32 ohms. The earpiece
is low impedance one since the sound pressure is to be generated using current and not
voltage as the supply voltage is restricted to 2.7 V. The earpiece is driven directly by the
UEM. The ear piece driver in UEM is a bridge amplifier.
is low impedance one since the sound pressure is to be generated using current and not
voltage as the supply voltage is restricted to 2.7 V. The earpiece is driven directly by the
UEM. The ear piece driver in UEM is a bridge amplifier.
Figure 10: Speaker Connection
1000R@100MHz
1000R@100MHz
22R
22R
EARP
EARN
UEM
22pF
22pF