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BD3870FS Arkusz danych(PDF) 9 Page - Rohm

Numer części BD3870FS
Szczegółowy opis  Sound Processors with Built-in 3-band Equalizers
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Producent  ROHM [Rohm]
Strona internetowa  http://www.rohm.com
Logo ROHM - Rohm

BD3870FS Arkusz danych(HTML) 9 Page - Rohm

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Technical Note
9/15
www.rohm.com
2010.10 - Rev.A
© 2010 ROHM Co., Ltd. All rights reserved.
BD3870FS,BD3871FS,BD3872FS,BD3873FS
C1
C2
R3
R4
IN
R1
+
-
R2

(Hz)
R4
R3
R2
C1C2
R4
R3
R1R2
2 π
1
f0

C2
C1
R1
R4
R3
R2
R1R2R4C1C2
Q



(dB)
1
C1
C2
R4
R3
R2
R1
R2R3
1
C1
C2
R4
R3
R2
R1
R4
R3
R2
20log
G(boost)
Description of operations
1) Bass filter
Using external components, center frequencies and Q factors of the bass characteristics are flexible
Fig.5
Standard values of R3, R4 (reference)
(R1=5.6kΩ, R2=390kΩ, C1=C2=0.1µF)
Bass Boost Cut Amount
Resistance (kΩ) * Typ.
R3
R4
0dB
77.64
0
2dB
58.90
18.73
4dB
44.02
33.60
6dB
32.20
45.42
8dB
22.82
54.80
10dB
15.36
62.26
12dB
9.44
68.18
14dB
4.78
72.84
* The actual boost cut amount may deviate from the standard values in some degree.


(
dB)
1
C1
C2
R4
R3
R2
R1
R4
R2(R3
1
C1
C2
R4
R3
R2
R1
R2R3
20log
cut
G
Fig.6
G
f
F0
G
G


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