LC75348 查看數據表（PDF） - SANYO -> Panasonic

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产品描述 (功能)

生产厂家

LC75348

Single-Chip Electronic Volume and Tone Control System

SANYO -> Panasonic 

LC75348, 75348M

Bass Band Circuit

This section presents the equivalent circuit and the formulas for calculating the R and C values for a 100 Hz center

frequency.

• Bass band equivalent circuit

R1

C1

R2

C2

R3

• Sample calculation

Specifications: Center frequency: f0 = 100 Hz

Gain at maximum boost: G = 20 dB

Assume R1 = 0, R2 = 66.6 kΩ, and C1 = C2 = C.

(1) Determine R3 from the G = 20 dB condition.

G+20dB = 20 × LOG10

1+

R2

2R3

R3 =

R2

2 10G+20dB/20 –1

=

66000

2 × (10 – 1)

= 3.7kΩ

(2) Determine C from the center frequency f0 = 100 Hz condition

1

f0=

2π R3R2C1C2

1

1

C=

=

= 0.1µF

2πf 0 R3R2 2π × 100 66000 × 3700

(3) Determine Q

R3R2

1

Q=

·

= 2.1

2R3 R3R2

No. 7308 -15/21

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