LC75421

Manufacturer Part NumberLC75421
DescriptionElectronic Volume Controller for Cars
ManufacturerSanyo Semiconductor Corporation
LC75421 datasheet
 


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Page 18/24:

Bass Shelving Circuit

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Bass Shelving Circuit

The equivalent circuit and calculation formula during boost are shown below.
• Bass band equivalent circuit diagram
• Calculation example 1
Specification Mean frequency: f0 = 40 Hz
Gain during maximum boost: G
Let us use R1 = 0 kΩ, R2 = 45.054 kΩ, C1 = 2.2 µF, and C1 >> C2.
We obtain R3 from G = 14 dB.
R2
R3
G
20 LOG
+14 dB
10
R3
R2
45054
R3
G/20
5.01 – 1
10
–1
We obtain C2 from mean frequency f0 = 40 Hz.
1
f 0
2
R3R2C1C2
1
C2
2
(2 f0)
R2R3 C1
(2
40)
Simulation Results
Setting
f = 100 Hz
f = 1 kHz
14 dB
13.55
3.65
12 dB
11.73
3.51
10 dB
9.8
3.31
8 dB
7.89
3
6 dB
5.94
2.55
4 dB
3.97
1.92
2 dB
1.99
1.07
LC75421M
R1
R2
C1
R3
= 14 dB
+ 14 dB
11 K
1
2
–6
45054 11000 (2.2 10
)
C2
0.015 F
No. 6866-18/24