Subwoofer Audio Amplifier Using TDA2003 IC

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3 TDA2003 IC Pinout

What is a Subwoofer Amplifier?

A Subwoofer Amplifier can be considered as a loudspeaker that generates low-frequency audio signals. They’re specially configured electronic circuits that are used to enhance the signal strength & bass quality of any input audio signal. Subwoofer amplifiers find their use mainly in the entertainment industry where audio quality is of utmost importance in procedures such as live music production & recording. So in this tutorial, we will look into a step-by-step process on How to make a Subwoofer Amplifier circuit using TDA2003 audio amplifier IC.

The heart of this circuit is a TDA2003 10W audio amplifier IC. It is a general-purpose audio amplifier IC that is useful in stereo or mono audio design circuits. The amplifier can output up to 3.5A current to drive speakers and can also handle high currents up to 5A for a short duration without any damage.

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Hardware Components

The following components are required to make Subwoofer Amplifier Circuit

S.no	Component	Value	Qty
1.	Audio Amplifier IC	TDA2003	1
2.	Loud Speaker	16 Ohm	1
3	Audio Jack (Male)	3.5mm	1
4.	Subwoofer Amplifier PCB	–	1
5.	Potentiometer	100K	1
6.	Capacitors	470uF, 2.2uF, 250pF	2, 1, 1
7.	Film capacitor	1.8uF/250V
8.	Soldering Iron	45W – 65W	1
9.	Soldering Wire With Flux	–	1
10.	Resistor	2.2 Ohm, 220 Ohm	1
11.	DC Battery	12V	1
12.	Battery Clip	–	1
13.	Smartphone/PC	–	1

TDA2003 IC Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of TDA2003

Subwoofer Amplifier Circuit

Working Explanation

A subwoofer amplifier works on the following principle. Audio input is taken from a device such as a smartphone. Here a 2.2uF coupling capacitor (C3) is used to block any DC signal, allowing only the AC component of the signal to move on towards the input pin IN+ pin of the TDA2003 amplifier IC.

The output from the audio amplifier IC then goes through a filtering capacitor (C2) to filter out any residual noise from the IC output signal before allowing it to move on towards the output. The output audio signal can be taken on any loudspeaker of appropriate resistance. connect a 1.8pF 250V film capacitor in case the speaker output is noisy.