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參數(shù)資料
| 型號(hào)： | LA3220 |
| 元件分類(lèi)： | 音頻／視頻放大 |
| 英文描述： | 2 CHANNEL, AUDIO PREAMPLIFIER, DIP14 |
| 封裝： | DIP-14 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 143K |
| 代理商： | LA3220 |
LA3220
No.912-5/9
1. Circuit Construction
1) This is a dual pre-amp composed of AMP
× 2, ACL × 2. Input is obtained from NPN differntial TR1, TR2 ; and
differntial load uses active element TR3 to obtain high voltage gain. The output stage is push-pull system with drive
for low load impedance, and can be directly connected to ALC circuit and meter circuit. Also, because the amp open
loop gain is sufficiently high, it can be used for recording amp and variable monitor is possible. Input impedance is
determined by built-in resistor R1, and is 30k
Ω.
2) ALC Circuit
The ALC circuit is composed of TR1, TR2, and due to DC voltage applied to the 7 control terminals, allows variable
impedance between TR1 collector and emitter and controls pre-amp input level.
* Attack Time and Recovery Time
Attack time is between when input signal is applied until ALC begins to operate. Rcover time is between justed by
R2, C3 time constant. Recovery time is between when input signal disappears to when amp level returns to the
original level. Attack time can be adjusted by C4, R3 time constant.
The rectification circuit, which obtaines ALC control voltage, should be a voltage doubler with superior
compression ratio. Also, for low voltage 6V sets, etc., a germanium diode is recommended for D1, D2.
8
3
2
4
1
5
D1
R2
D2
D3
D4
R3
R1
R4
R5
pc1
R6
TR5
TR6
TR8
TR7
TR1
TR2
TR3
TR4
R7
TR1
TR2
R3 C4
R2
C3
C2
C1
D1
D2
DS442
× 2
5
6
1
2
7
R1
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