參數(shù)資料
型號(hào): KA22296
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: Playback / Record PRE AMP FOR DOUBLE DECK(重放/錄音前置放大器)
中文描述: 播放/錄音前級(jí)的雙層(重放/錄音前置放大器)
文件頁(yè)數(shù): 14/17頁(yè)
文件大?。?/td> 157K
代理商: KA22296
KA22296 DOUBLE DECK SYSTEM FOR RADIO CASSETTE
6. NAB CIRCUIT DESIGN
7. Etc
At the time of High speed copying mode, the ALC will be off and actual recorded system is
used while for normal speed it is recorded through ALC.
Within the switch input, it is advisable to keep the voltage below 6V for security.
It may consider the external peaking circuit for recording at high speed recording mode.
The head switching is used as mechanical switch or FET switch for recording circuit.
+
-
27/30
28/29
to input selector
R2 = 1.8K
R2 = 3.3K
H
N
Rnt = 82
47uF
R1=82K
C1=0.039uF
Fig 6 - 1
T1 = 3198mSec,
T2 = 123mSec (Nomal) 24mSec,
= 70mSec (High) 14mSec
Z =(R1 + R2)
1 + j w C1 { R1 R2 / ( R1 + R2)}
1 + j w C1 R1
And
T1 = C1R1,
T2 = C1 ( R1 // R2),
NAB device is comprised of R1, R2, C1 and its
impedance is as expressed and given.
** Internal resistance R2’s processor distribution
is 20%.
Frequency gain can be esaily discovered as per
given.
Gv = 20log ((Rnf + Z) / Rnf)
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