參數(shù)資料
型號(hào): LC75397E
廠商: Sanyo Electric Co.,Ltd.
英文描述: Single Chip Electronic Volume and Tone Control System(單片電子音量和音調(diào)控制系統(tǒng))
中文描述: 單芯片電子音量和音調(diào)控制系統(tǒng)(單片電子音量和音調(diào)控制系統(tǒng))
文件頁數(shù): 19/26頁
文件大?。?/td> 561K
代理商: LC75397E
External Capacitor Calculations
1. Bass circuit
The value of the external capacitor used by the LC75397E bass control can be calculated as shown in the example below.
Sample calculation: For a center frequency f0 of 39 Hz
Substitute the LC75397E internal resistors R1 and R2 shown below into the above formula.
This allows the value of the capacitor, C, to be calculated.
R1 = 1.3 k
R2 = 57.993 k
Assume C1 = C2 = C.
1
C = ——————
2
π
f0 R1R2
1
C = ———————————
0.47 μF
2
π
×
39
×
1300
×
58000
Formula for calculating the gain:
R1 = 1.3 k
R2U = 1.476 k
R2L = 56.517 k
R1
R1 (R2U + R2L)
G = (—————)
2
+ (—————————————)
2
= 3.16 = 10 dB
R1 + R2U
(R1 + R2U) R1 (R2U + R2L)
Formula for calculating Q:
(R1 + R2U) R1 (R2U + R2L)
Q = ———R1 (R2U + R2L)
G
No. 6108-19/26
LC75397E
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