AS3435 datasheet(15/102 Pages) AMSCO

15 / 102 page

ams Datasheet, Confidential: 2014-Jun-13 [v1-30]

AS3415/AS3435 – 15

Detaile d Desc rip t ion

Figure 12:

Bass Boost Circuit

Bass Boost Definition: This figure shows the circuit diagram for the line input bass boost EQ circuit.

The component values for AL can be calculated with the

following formula:

...[dB]

The component values for AH can be calculated with the

following formula:

...[dB]

An example for a typical bass boost is 6dB gain at the low

frequency. If we select for R1 a value of 10kΩ we can calculate

R2 as follows:

In this example, the gain for the higher frequency should be

0dB.This allows us to calculate R3 as follows:

The last component to be calculated for the example is

capacitor C1. This capacitor defines the cut-off frequency of the

bass boost circuit. The desired gain level Acut-off at the cut-off

frequency can be defined by the engineer together with the

frequency. In this example, we select a cut-off frequency of

400Hz and a gain level of 5dB. Thus we get an attenuation of

1dB at a frequency of 400Hz. The necessary capacitor can be

calculated with the following formula:

------

⋅

()

⋅

----------------------------------

------

⋅ 1

------

10k

⋅

20k

–

⋅

–

-------------------------------

------

–10k

Ω 20kΩ

⋅⋅

------

10k

⋅

20k

–

---------------------------------------------------

20k

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