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Tone Circuit Constant Calculation Example
Bass Band Circuit
The equivalent circuit and the formula for calculating the external RC with a mean frequency of 100 Hz are shown
below.
• Bass band equivalent circuit block diagram
• Calculation example
Specification Mean frequency: f0 = 100 Hz
Gain during maximum boost: G = 12 dB
Let us use R1 = 0, R2 = 38.861 kΩ, R3 = 6.5 kΩ (assuming R1 = 0 during maximum boost) , and C1 = C2 = C.
1. We obtain C from mean frequency f0 = 100 Hz, as follows.
1
f
0
=
π
2
R3R2C1C2
1
C
=
=
π
2
f0
R3R2
2. We obtain Q as follows.
R3R2
1
×
Q
=
2
R3
R3R2
LC75411ES, 75411WS
R1
C1
1
≅
π
×
2
100
38861×6500
≅
1.223
R2
C2
R3
0.1µF
No. 6928-24/33
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