lc75411es Sanyo Semiconductor Corporation, lc75411es Datasheet - Page 24

• Manufacturer Part Number: lc75411es
• Description: Electronic Volume Controller For Car Audio Systems
• Manufacturer: Sanyo Semiconductor Corporation

Tone Circuit Constant Calculation Example
Bass Band Circuit
The equivalent circuit and the formula for calculating the external RC with a mean frequency of 100 Hz are shown
below.
• Bass band equivalent circuit block diagram
• Calculation example
Specification Mean frequency: f0 = 100 Hz
Gain during maximum boost: G = 12 dB
Let us use R1 = 0, R2 = 38.861 kΩ, R3 = 6.5 kΩ (assuming R1 = 0 during maximum boost) , and C1 = C2 = C.
1. We obtain C from mean frequency f0 = 100 Hz, as follows.
2. We obtain Q as follows.
C
f =
Q =
0
=
2
R3R2
2
2
f0
R3
1
R3R2C1C2
R3R2
1
R3R2
1
=
2
1.223
100
38861 6500
1
C1
LC75411ES, 75411WS
R1
0.1 F
R3
R2
C2
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