Buzzer; Flashlight - Nokia RH-18 Manual

CCS Technical Documentation
The RC filter (220 Ω, 4.7µF) is scaled to provide damping at 217 Hz.
UEM
MICB1
2k2
MIC1P
2k2
MIC1N
MICBCAP
1u

Buzzer

The ringing tones are generated by a buzzer, which gives monophonic ringing tones. Fig-
ure below shows the electrical interface of the buzzer..
UEMc
VBATDriv
VSADriv2

Flashlight

The flashlight feature can be used to light up for example a keyhole.
Flashlight nominal
current
20mA
6mA
Issue 1 10/03
Company confidential
220 1k
4.7uF
2*33n
1n 1n
Figure 6: Internal electrical microphone interface
Vbat
56pF
Buzz0
56pF
Figure 7: Electrical interface of buzzer
Temperature
25°C
85°C
Table 15: Flashlight LED currents
Nokia Corporation.
Placed near
Placed near
bottom
UEM
connector
2k2
2k2
12pF
220nH
220nH
12pF
Note
See Figure 8
See Figure 8
RH-18/36/38
Engine module
MIC+
1n
MIC-
Buzzer
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