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LC75421 Datasheet(PDF) 19 Page - Sanyo Semicon Device

Part # LC75421
Description  Electronic Volume Controller for Cars
PDF  24 Pages
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Manufacturer  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LC75421 Datasheet(HTML) 19 Page - Sanyo Semicon Device

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No. 6866-19/24
LC75421M
• Calculation example 2
Specification Mean frequency: f0 = 40 Hz
Gain during maximum boost: G = 12 dB
Let us use R1 = 0 k
Ω, R2 = 45.054 kΩ, C1 = 2.2 uF, and C1 >> C2.
We obtain R3 from G = 12 dB.
We obtain C2 from mean frequency f0 = 40 Hz.
G
+12 dB
= 20 × LOG
10
R2
+ R3
R3
R3
=
R2
10G/20 –1
45054
3.98 – 1
=
≠ 15 KΩ
f 0
=
R3R2C1C2
1
2
π
C2
=
=
1
(2
πf0)2 R2R3C1
1
(2
π × 40)2 × 45054 × 15000 × (2.2 × 10–6)
≠ 0.01 µF
Setting
f = 100 Hz
f = 1 kHz
14 dB
11.73
4.27
12 dB
10.29
4.07
10 dB
8.74
3.78
8 dB
7.11
3.38
6 dB
5.41
2.82
4 dB
3.65
2.09
2 dB
1.85
1.15
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