— 11 —
FILTER BLOCK
Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the
waveforms.
POWER AMPLIFIER (IC101: TA8248K)
The power amplifier is a two-channel amplifier with standby switch.
The following table shows the pin function of IC101.
2.2K
820PF
8.2 µF
10 V 22 µF
AG AG AG
AG
AG
22 Ω
2SC1740SQ.R
AG
AVDD
AVDD
3.9K
10K
6.3V 1000 µ
22K
1K
2SC1740SQ.R
50 V 0.22 µ
50 V 3.3 µ
From DAC
To main volume
+
+
1K4.7K3.3K
12 µF
47 Ω
Pin No. Terminal In/Out Function
1 NC — Not used
2 B.S.2 — Terminal for a bootstrap capacitor
3 OUT2 Out Channel 2 output
4 VCC In +9 V source
5 OUT1 Out Channel 1 output
6 B.S.1 — Terminal for a bootstrap capacitor
7 Power GND In Ground (0 V) source
8 Stand by In Power control signal input. 0 V: Off, +9 V: On
9 DC — Terminal for a decoupling capacitor
10 NF1 In Negative feedback input
11 IN1 In Channel 1 input
12 IN2 In Channel 2 input
13 NF2 In Negative feedback input
14, 15 Pre GND In Ground (0 V) source
To Next Page
Loading...
Need help?
General
