參數(shù)資料
型號(hào): LC75281E
廠商: Sanyo Electric Co.,Ltd.
英文描述: Parametric Equalizer System
中文描述: 參數(shù)均衡器系統(tǒng)
文件頁數(shù): 6/10頁
文件大小: 176K
代理商: LC75281E
Center frequency (fo)
External capacitor calculations
Figure a shows the LC75281E internal f0 control circuit. The center frequency f0 can be set to one of 11 frequencies in
1/3 octave steps by switching the resistors in the figure.
The value of the external capacitor C is determined by substituting the desired center frequency in the following formula.
fo max: Corresponds to 315 Hz in the low band row in the preceding table.
Gain: 13 positions in 2-dB steps
Q
No. 5913-6/10
LC75281E
Band
f1
f2
f3
f4
f5
f6
f7
f8
f9
f10
f11
External capacitor (μF)
Low
31.5
40
50
63
80
100
125
160
200
250
315
0.047
Low mid
160
200
250
315
400
500
630
800
1 k
1.25 k
1.6 k
0.0094
High mid
630
800
1 k
1.25 k
1.6 k
2 k
2.5 k
3.15 k
4 k
5 k
6.3 k
0.00235
High
1.6 k
2 k
2.5 k
3.15 k
4 k
5 k
6.3 k
8 k
10 k
12.5 k
16 k
0.0094
Cf =
1
Rb//Rf
2
π
Rf fo max
Ra + (Rb//Rf)
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q
0.404
0.667
1.41
2.15
2.87
4.32
5.76
8.65
OCT
3
2
1
2/3
1/2
1/3
1/4
1/6
Figure a
Equivalent Circuit for Cf calculation
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