Toshiba TLP510E Teknik Eğitim Kılavuzu - Sayfa 38

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7-3-7. Audio Circuit

Fig. 7-3-12 shows the audio circuit block diagram.

Signal path from the QV001 to the LINE OUT terminal

is: QV001 ® transistor buffer ® LINE OUT terminal.

Signal path from the QV001 to the speaker is as follows.

The audio signal developed from the QV001 becomes

one signal with its L and R signal components mixed.

The mixed audio signal enters the electrical volume IC

QA01 (M5222FP) and the output level is controlled

within a range of about 0 dB to –80 dB by an external

DC voltage (DAC). The audio signal thus controlled by

the IC QA01 is fed to the speaker amplifier IC QA02

(TDA7056A) and amplified by about 36 dB to drive the

speaker.

VIDEO

QV001

INPUT SELECTOR

RGB

CXA1855Q

LINEOUT

BUFFER

VOLUME

DAC

MUTE

CXA1315M

Fig. 7-3-12 Audio circuit block diagram

QA01

M5222FP

VOL / MUTE

QA02

TDA7056A

SPEAKER

SOUND OUT

1.5W

7-11