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參數(shù)資料
| 型號： | LC75421M |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO36 |
| 封裝： | 0.375 INCH, MFP-36 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大小： | 392K |
| 代理商： | LC75421M |
No. 6866-18/24
LC75421M
Bass Shelving Circuit
The equivalent circuit and calculation formula during boost are shown below.
Bass band equivalent circuit diagram
Calculation example 1
Specification Mean frequency: f0 = 40 Hz
Gain during maximum boost: G + 14 dB = 14 dB
Let us use R1 = 0 k
, R2 = 45.054 k, C1 = 2.2 F, and C1 >> C2.
We obtain R3 from G = 14 dB.
We obtain C2 from mean frequency f0 = 40 Hz.
R1
R2
R3
C1
C2
G
+14 dB
= 20 × LOG
10
R2
+ R3
R3
=
R2
10G/20 –1
45054
5.01 – 1
=
≠ 11 K
f 0
=
R3R2C1C2
1
2
π
C2
=
1
(2
πf0)2 R2R3C1
1
(2
π × 40)2 × 45054 × 11000 × (2.2 × 10–6)
≠ 0.015 F
Simulation Results
Setting
f = 100 Hz
f = 1 kHz
14 dB
13.55
3.65
12 dB
11.73
3.51
10 dB
9.8
3.31
8 dB
7.89
3
6 dB
5.94
2.55
4 dB
3.97
1.92
2 dB
1.99
1.07
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