Samsung SGH 600, Service Manual

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2-10 Samsung Electronics
2-13 Hands Free Car kit
2-13-1 General Description
Many states and countries are considering legislation requiring mobile phone users to operate in Hands-Free
mode while driving.
Feature of the hands free kit are:
- Power adaptor (600 mA) from vehicle battery to GSM battery pack.
- Ignition sensor for automatic power ON/OFF.
- Car stereo mute function in Hands-Free mode, with programmable output level.
- External microphone input.
- Loudspeaker output.
- Hands-Free operation.
2-13-2 Circuit Description
The input voltage range is from 12V dc to 28V dc, (battery) and input current is 10mA(stanby). The operating
temperature is -10 ~ 60
o C, and for storage temperature is - 30 ~ 85 o C(± 5 o C). The charging voltage is DC9V
and charging current is MAX 600mA.
2-13-3 Audio Features
- Microphone Sensitivity: -60 dB ± 3 dB
- Speaker S/N: -45 dB ± 3 dB (1W Output)
- Speaker Distortion: 20% below (3W Output)
- Speaker Feature: Impedance 4½, Max 5W Output
- Echo Cancellation: 50 dB (Min)
- Noise Suppression: 15 dB (Min)
Circuit Description