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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)： | 7/11頁 |
| 文件大?。?/td> | 224K |
| 代理商： | LA4160 |
LA4160
No.870-5/11
Sample Application Circuit 2 : Radio-Cassette Recorder
1
14
2
13
3
12
4
11
5
10
6
9
7
8
LA4160
+
1000
μF
VCC
Power GND
+
470
μF
220
μF
+
++
+
4.7
μF
47
μF
4.7
μF
22
μF
0.033
μF
10
μF
100
μF
100
μF
470
μF
0.15
μF
51
Ω
51k
Ω
510
Ω
4.7k
Ω
56
Ω
30k
Ω
3.3k
Ω
20k
Ω
Meter
300k
Ω
2.2k
Ω
20pF
1000pF
1S188
SW3
SW4
SP
SW1
SW2
MIC.J.
EAR.J.
MIC
Tape
Radio
R/P Head
Bias
OSC
Tape
Radio
to Radio
10k
Ω
VR
(Polyester film
capacitor)
SW1 to SW4 (PLAY/REC SW) : PLAY
An Example of Printed Board (Cu-foiled side)
10
μF
22
μF
4.7
μF
220
μF
470
μF
470
μF
0.15
μF
470
μF
4.7
μF
100
μF
100
μF
4.7
μF
pre out
ALC IN
ALC SW
6
φ
OUT
Power in
1S188
pre in
1
7
14
8
0.033
μF
R/P SW
VCC
680
Ω
51
Ω
30k
Ω
10k
Ω
51k
Ω
4.7k
Ω
2.2k
Ω
56
Ω
10pF
80
×150mm2
LA4160
Description of Application Circuit
1. Preamplifier
The preamplifier circuit consists of the input differential stage (TR9, 10), level shift stage (TR13), and output stage
(TR17, 18, 19). Since the output stage is of push-pull type, no remarkable drop in the output voltage occurs even at
low load impedances and the output can be connected direct to the ALC circuit and meter circuit. The external
DC/AC feedback resistor (Z2) can be set arbitrarily and the closed loop gain is obtained by the following equation.
VG (pre) 20 log (
Z2
Z1
The input impedance depends on internal resistance R2 which is 30k
Ω.
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