參數(shù)資料
型號(hào): LC75421M
廠商: Sanyo Electric Co.,Ltd.
英文描述: Electronic Volume Controller for Cars
中文描述: 汽車電子音量控制器
文件頁(yè)數(shù): 15/24頁(yè)
文件大?。?/td> 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.
Q
=
R
3
R
2
No. 6866-15/24
LC75421M
C1
R1
R2
R3
C2
G
+20
dB
=
20
×
LOG
10
1
+
R
2
2
R
3
R
3
=
R
2
2 10
G+20dB
/20
–1
66600
2
×
(10 – 1)
=
3.7
K
f
0
=
R
3
R
2
C
1
C
2
1
2
π
C
=
=
1
2
π
f
0
R
3
R
2
1
2
π
×
68 66600
×
3700
0.15
μ
F
R
3
R
2
2
R
3
1
2.1
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