LC75421 データシートの表示（PDF） - SANYO -> Panasonic

部品番号

コンポーネント説明

メーカー

LC75421

Electronic Volume Controller for Cars

SANYO -> Panasonic 

LC75421M

Bass Shelving Circuit

The equivalent circuit and calculation formula during boost are shown below.

• Bass band equivalent circuit diagram

R1

C1

R2

C2

R3

• Calculation example 1

Specification Mean frequency: f0 = 40 Hz

Gain during maximum boost: G + 14 dB = 14 dB

Let us use R1 = 0 kΩ, R2 = 45.054 kΩ, C1 = 2.2 µF, and C1 >> C2.

We obtain R3 from G = 14 dB.

G+14 dB = 20 × LOG10

R2 + R3

R3

R3 = R2

= 45054 ≠ 11 KΩ

10G/20 –1

5.01 – 1

We obtain C2 from mean frequency f0 = 40 Hz.

f0=

1

2π R3R2C1C2

C2 =

1

=

1

≠ 0.015 µF

(2πf0)2 R2R3C1 (2π × 40)2 × 45054 × 11000 × (2.2 × 10–6)

Simulation Results

Setting

14 dB

12 dB

10 dB

8 dB

6 dB

4 dB

2 dB

f = 100 Hz

13.55

11.73

9.8

7.89

5.94

3.97

1.99

f = 1 kHz

3.65

3.51

3.31

3

2.55

1.92

1.07

No. 6866-18/24

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