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參數(shù)資料
| 型號： | LA4160 |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2.2 W, 1 CHANNEL, AUDIO AMPLIFIER, PDIP14 |
| 封裝： | HEAT SINK, DIP-14 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大小： | 224K |
| 代理商： | LA4160 |
LA4160
No.870-6/11
Preamplifier Circuit
Since the maximum output voltage for THD = 1% drops at less than 600
Ω of the composite load impedance viewed
from output pin (6), it is desirable to make the composite load impedance more than 600
Ω when using this IC.
(Refer to VO max, THD – RL characteristics.)
2. ACL Circuit
5
14
9
10
11
VCC
Meter
R35
300
Ω
R31
2.2k
Ω
R32
ALC
OUT
+
Preamp.
Preamplifier
input
3k
Ω
R1
R34
R33
C4
C5
TR2
TR1
300
Ω
R20
ALC IN
control
pin
Voltage doubler
rectifier
1S 188
×2
6
The ALC circuit is of Darlington configuration which consists of TR1, 2. The collector-to-emitter impedance of TR1
made variable by the DC voltage to be applied to control pin (5) and the input voltage of the preamplifier is
controlled. Whe the DC voltage to be applied to pin (5) is set at approximately 1.1V, TR1, 2 are turned ON and ALC
is turned ON. For the rectifier circuit, it is recommended to use the voltage doubler rectifirer which is excellent in
compression ratio. For the sets of 6V VCC, it is recommended to use a germanium diode so that the ALC width can
be made wider even at the time of decreased voltages.
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