LC75410E データシートの表示（PDF） - SANYO -> Panasonic

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LC75410E

Electronic Volume Controller for Car Audio Systems

SANYO -> Panasonic 

LC75410E, 75410W

F1/F2/F3 Band Circuit

The equivalent circuit and the formula for calculating the external RC with a mean frequency of 1 kHz are shown below.

• F1/F2/F3 band equivalent circuit block diagram

R1

R2

C1

C2

R3

• Calculation example

Specification Mean frequency: f0 = 1 kHz

Gain during maximum boost: G+12 dB = 12 dB

Let us use R1 = 0.027 kΩ, R2 = 38.861 kΩ and C1 = C2 = C.

1. Calculate R2 with G+12 dB = 12 dB:

G+12 dB = 20 × LOG10

1 + R2

2R3+R1

R3 =

R2 – R1 ÷ 2 ≅ 6.5 kΩ

10G/20 –1

2. Calculate C with the center frequency f0 = 1 kHz

f0=

1

2π (R1+R2)R3C1C2

C=

1

=

1

= 0.010 × 10–6 ≅ 0.01 µF

2πf0 (R1+R2)R3 2π ×1000 38888×6500

3. Calculate Q:

Q=

1

× R3(R1+R2) ≅ 1.22

(R1+R2)R3 (2R3+R1)

No. 7027-20/28

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