4.2.1.2 Main Board
4.2.1.2.1 External Interface Part
Regulator for Power 5V (IC910)
Input voltage: +12V
Output voltage: +5V
Package: 8pin SOP-8
Outline of Operation: It generate from +12V to +5V.
Regulator for BBIC & SP AMP 4V (IC930)
Input voltage: +12V
Output voltage: +4V
Package: 8pin SOP-8
Outline of Operation: It generate from +12V to +4V.
Regulator for 3.3V (IC920)
Input voltage: +12V
Output voltage: +3.3V
Package: 8pin SOP-8
Outline of Operation: It generate from +12V to +3.3V.
FM Demodulation (IC670)
Operating Power Supply : +5V
Package: 24pin SOP
Outline of Operation: The video signal (FM) from the Door
Station is demodulated.
Regulator for 5V (IC671)
Input voltage: +12V
Output voltage: +5V
Package: 5pin SOT-25A.
Outline of Operation: It generate from +12V to +5V (FM
Demodulation).
OP AMP for Door station (IC500)
Operating Power Supply : +12V
Package: 8pin SSOP-8
Outline of Operation: The sound signal (send & receive)
are converted to 2 line from 4 line.
PBX OFF-HOOK detection photo coupler (IC800)
Operating Power Supply : +3.3V
Package: 4pin
Outline of Operation: The off hook signal is detected.
OP AMP for PBX 2/4 conversion (IC801)
Operating Power Supply : +12V
Package: 8pin SSOP-8
Outline of Operation: The sound signal (send & receive)
are converted to 2line from 4line.
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