TDA2030 Subwoofer Amplifier Circuit

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In this tutorial, we are going to make a “TDA2030 Subwoofer Amplifier circuit”. A subwoofer (or sub) is a loudspeaker designed to reproduce low-pitched(bass and sub-bass) audio frequencies, these frequencies are lower than those which can be generated by a woofer. The typical frequency range for a subwoofer is about 20–200 Hz for consumer products and below 100 Hz for professional live sound. They are never used alone, as intended to augment the low-frequency range of loudspeakers that cover the higher frequency bands. While the term “subwoofer” technically only refers to the speaker driver, in common parlance, the term often refers to a subwoofer driver mounted in a speaker enclosure, often with a built-in amplifier.

Here we design a simple subwoofer amplifier circuit by using TDA2030 IC, and this is intended for use as a low-frequency class-AB amplifier. It provides 14 watts of output, by adding another stage it may give an output of up to 30 watts. This circuit needs a split power supply with a one-amp current rating for better performance. And use a heat sink over TDA2030 IC to avoid thermal runaway. This IC comes in a Pentawatt Horizontal package and has a wide range of operating voltages up to 36V. And it is capable of working in a single or split power supply.

Hardware Required

S.noComponentValueQty
1.ICTDA20301
2.Resistor22KΩ,680Ω,1Ω4,2,2
3.Capacitor0.1uf,0.22uf,2.2uf/16V,22uf/25V,100uf/25V2,2,1,2,2
4.Connecting Wires
5.Speaker1
6.Battery15V1

Circuit Diagram

Details of the main part of this circuit are as follows.

tda2030-subwoofer-amplifier-circuit-diagram-schematic
TDA2030 IC Pinout

Working Explanation

As we can see in the circuit, there are two TDA2030 amplifiers. The here upper side amplifier output is connected to the speaker +ve terminal and the lower side amplifier O/P is connected to the -ve terminal of the speaker. Audio input is applied to the non-inverting input of IC1 and IC2 and grounded through the R8 resistor. Each amplifier takes feedback through inverting input. This circuit uses a split power supply (+15V, GND, -15V), by using this bridge amplifier configuration we can get output power up to 30 watts.

Applications

Used in Hi-Fi field applications such as home stereo, self-powered loudspeakers, and top-class TV.