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參數資料
| 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： | 7/24頁 |
| 文件大小： | 392K |
| 代理商： | LC75421M |
Tone Circuit Constant Calculation Examples
Super Bass Band Circuit
The equivalent circuit and the formula for calculating the external RC with a mean frequency of 68 Hz are shown
below.
Super bass band equivalent circuit block diagram
Calculation example
Specification Mean frequency: f0 = 68 Hz
Gain during maximum boost: G = 20 dB
Let us use R1 = 0, R2 = 66.6 k
, and C1 = C2 = C.
We obtain R3 from G = 20 dB.
We obtain C from mean frequency f0 = 68 Hz.
We obtain Q.
No. 6866-15/24
LC75421M
C1
R1
R2
R3
C2
G
+20 dB
= 20 × LOG
10
1
+
R2
2R3
R3
=
R2
2 10G+20dB/20 –1
66600
2
× (10 – 1)
=
≠ 3.7 K
f 0
=
R3R2C1C2
1
2
π
C
=
1
2
πf0 R3R2
1
2
π × 68 66600 × 3700
≠ 0.15 F
Q
=
R3R2
2R3
1
≠ 2.1
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