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LC75412 Datasheet(PDF) 17 Page - Sanyo Semicon Device

Part # LC75412
Description  Electronic Volume Controller for Car Audio Systems
PDF  21 Pages
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Manufacturer  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LC75412 Datasheet(HTML) 17 Page - Sanyo Semicon Device

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– R1
÷ 2 = 3900 Ω
R3 =
10G/20 – 1
R2
F1/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/F3 band equivalent circuit block diagram
1. Calculate R3 with G+18 dB = 18 dB:
2. Calculate C with the center frequency f0 = 1 kHz
No. 7053-17/21
LC75412E, 75412W
• Calculation example
Specification Mean frequency: f0 = 1 kHz
Gain during maximum boost: G+18 dB = 18 dB
Let us use R1 = 0.665 k
Ω, R2 = 58.704 kΩ, and C1 = C2 = C.
R1
R2
R3
C2
C1
2
1
0
(R1+R2)R3C1C2
f
π
=
0.01
µF
39359
×3900
1000
2
1
(R1+R2)R3
f0
2
1
π
π
≅
×
=
= 0.010
× 10–6
=
C
3. Calculate Q:
1.789
R3(R1+R2)
(R1+R2)R3
(2R3+R1)
1
≅
×
=
Q
1 +
G+18 dB = 20 × LOG10
2R3+R1
R2



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