參數(shù)資料
型號(hào): LC75348M
廠商: SANYO SEMICONDUCTOR CO LTD
元件分類: 音頻控制
英文描述: 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO30
封裝: MFP-30
文件頁(yè)數(shù): 7/21頁(yè)
文件大?。?/td> 214K
代理商: LC75348M
Bass Band Circuit
This section presents the equivalent circuit and the formulas for calculating the R and C values for a 100 Hz center
frequency.
Bass band equivalent circuit
Sample calculation
Specifications: Center frequency: f0 = 100 Hz
Gain at maximum boost: G = 20 dB
Assume R1 = 0, R2 = 66.6 k
, and C1 = C2 = C.
(1) Determine R3 from the G = 20 dB condition.
(2) Determine C from the center frequency f0 = 100 Hz condition
(3) Determine Q
No. 7308 -15/21
LC75348, 75348M
R1
C1
C2
R2
R3
G+20dB = 20 × LOG10 1 +
R2
2R3
R3 =
R2
2 10
G+20dB/20 –1
66000
2
× (10 – 1)
=
= 3.7k
f 0 =
R3R2C1C2
1
C =
=
= 0.1F
1
2
πf 0
2
π
R3R2
1
2
π × 100 66000 × 3700
Q
R3R2
=
= 2.1
2R3
1
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