— 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
µ
F
10 V 22
µ
F
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
+
+
1K
4.7K
3.3K
12
µ
F
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
Содержание CTK-620L
Страница 16: ...15 SCHEMATIC DIAGRAMS Main PCB JCM447 MA1M AT 49 30M 4 11 1 12 7 8 3 5 6 2 10 9...
Страница 17: ...16 Sub PCB JCM447 MA2M 5 6 V 5 6 V 5 6 V 0 7 V 2 V 50V 1...
Страница 18: ...17 Console PCB JCM447 CN1M...
Страница 19: ...18 Console PCB JCM447 CN2M...
Страница 20: ...19 Display PCB JCM447 LCD1M...
Страница 21: ...20 Keyboard PCBs JCM618T KY1M KY2M...
Страница 22: ...21 LED PCB JCM447 LD1M...
Страница 23: ...22 LED PCB JCM447 LD2M...
Страница 24: ...23 LED PCB JCM447 LD6...
Страница 25: ...24 Console PCBs JCM447 CN3M CN4M...
Страница 26: ...25 Console PCB JCM447 CN5M...
Страница 27: ...26 LED PCBs JCM447 LD4M LD5M...
Страница 28: ...27 LED PCB JCM447 LD3M...
