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Filter Block Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the waveform.
AVDD
T1 2SC1740SQ R6 R5 C5 R11 C9 C10 C11 R7 R8
From CPU
To Amplifier
AG
AG
AG
Amplifier/Voltage Regulator (IC1: AN8053N) Consisting of an amplifier and a voltage regulator, AN8053N amplifies the sound signal from the CPU and also provides the CPU +5V source. The following figure shows the internal block of IC1.
5V VREG 13
VCC 16
NC 15
CONT 14
NC 12
NC 11
NC PRE GND 10 9
5V REG POWER
SP AMP + 1 SPO 2 NC 3 4 5 PC-2 6 SPI 7
VREF
8 VREF
SP GND PC-1
SPM
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