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Simple Subwoofer Amplifier Circuit using IC TDA7294

The TDA7294 can be used in a subwoofer amplifier circuit to increase the low frequency bass signals that get to a subwoofer speaker.

An integrated circuit made expressly to function as an audio amplifier is the TDA7294.

The TDA7294 is a monolithic integrated circuit, or one chip that comes in a multiwatt 15 package.

It is appropriate for powered loudspeakers home stereo systems, and even expensive TVs since it is especially made to operate as a class AB audio amplifier in high fidelity Hi-Fi applications.

Circuit Working:

Parts List:

CategoryItemQuantityNotes
Resistors22k31/4 watt
680Ω11/4 watt
10k11/4 watt
2.7Ω11/4 watt
CapacitorsCeramic 100nF3
Ceramic 470nF1
Electrolytic 22μF 25V2
Electrolytic 10μF 25V2
Electrolytic 1000μF 25V2
SemiconductorsIC TDA72941
OtherON/OFF Switch2
150 watt subwoofer speaker1

To maximize the performance of this amplifier circuit, use a 150 watt subwoofer speaker with an 8 ohm resistance.
If you can only find capacitors rated for 30V, use those instead of ones rated for at least 50V.

Higher voltage ratings offer more dependability and improved performance.

The advanced features pins are Vm and Vstby.

Leave them disconnected if you are not in need of them.

To prevent unexpected behavior just make sure that these pins are not experiencing any voltage.

Provide the audio signal from your music source to the TDA7294s non inverting input pin.

To create a simple volume control, place a 10,000 ohm variable resistor between the non inverting input pin and the audio input.

This circuit is simple to construct for prototyping on a standard solderless breadboard.

Attach a twin 30V power supply to supply the circuit with the required voltage after it has been built.

Formulas:

When designing a subwoofer amplifier circuit with the IC TDA7294 factors like thermal management, speaker impedance, power supply voltage and gain settings must be taken into account.

The following are the essential elements and formulas needed to create such a circuit:

Calculating Gain:

The circuits feedback resistors may be used to change the amplifier circuits gain.

The gain dB (Gain) is found using:

GdB​ = 20log10​(Rf / Ri​n​​)

where,

Calculating Output Power:

The following formula may be used to determine the maximum output power Pout that may be supplied to the speaker:

Pout​ = Vpeak2​​ / 2R

where,

You may successfully create a subwoofer amplifier circuit with the TDA7294 IC by adhering to these instructions and computations.

Modify component values according to your subwoofer applications particular needs and performance objectives.

How to Build:

To build a Simple Subwoofer Amplifier Circuit, below mentioned are the steps for connections:

Safety Nates:

Conclusion:

You may add strong bass to your music system by building a TDA7294 subwoofer amplifier circuit, but make safety your first priority.

Employ the appropriate parts control the heat using a heat sink and operate in a well ventilated space.

Consider beginning with a smaller project first if you are new to working with electronics.

References:

Datasheet IC TDA7294

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