LC75421

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


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Tone Circuit Constant Calculation Examples

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Tone Circuit Constant Calculation Examples

Super Bass Band Circuit
The equivalent circuit and the formula for calculating the external RC with a mean frequency of 68 Hz are shown
below.
• Super bass band equivalent circuit block diagram
• Calculation example
Specification Mean frequency: f0 = 68 Hz
Gain during maximum boost: G = 20 dB
Let us use R1 = 0, R2 = 66.6 kΩ, and C1 = C2 = C.
We obtain R3 from G = 20 dB.
R2
G
20 LOG
1
+20 dB
10
2R3
R2
66600
R3
2 (10 – 1)
G+20dB/20
2 10
–1
We obtain C from mean frequency f0 = 68 Hz.
1
f 0
2
R3R2C1C2
1
1
C
2 f0 R3R2
2
68 66600 3700
We obtain Q.
R3R2
1
Q
2.1
2R3
R3R2
LC75421M
R1
R2
C1
C2
R3
3.7 K
0.15 F
No. 6866-15/24