tda2030 2.1 subwoofer amplifier circuit diagram

TDA2030 2.1 Subwoofer circuit


When we want to make a 2.1 amplifier our own, we had Different types of tda2030 2.1 subwoofer circuits available on the internet, they all give us a different sound experience because each of the circuits made different modifications at circuits, such as implementing a low pass filter or changing power supply section.

We will have to show you, 2 simple and effective 2.1 amplifier circuits that anyone can make simply at home.

The tda2030 2.1 amplifier circuits produce 3 different outputs, these three outputs are subwoofer, right channel, and left channel. The subwoofer section produces a high bass sound, this will improve your music experience. The right and left channels will produce a normal stereo sound. 

This 2.1 amplifier is widely used on TV and computers. The sound experience is good for a small room because the output wattage is less than 18w.


tda2030 2.1 subwoofer circuit diagram

TDA2030 2.1 Subwoofer circuit
TDA2030 2.1 Subwoofer circuit


The main part of the 2.1 amplifier circuit is the tda2030 IC, they normally produce 14w mono output. And NE5532 op-amp and some passive components act as low pass filter, which is connected to amplifier section and it will produce heavy bass output. 

This circuit diagram working in 3 sections

1. Power supply

2. Stereo amplifier

3. Subwoofer amplifier


tda2030 2.1 Power supply


tda2030 2.1 Power supply

The quality of the output depends on the proper selection of the power supply. The 2.1 amplifiers working on a dual power supply, so first you need a 12-0-12, 3amp transformer.

The power supply has 4 sections, Ac to Ac converter, capacitor filter, ac to dc converter, and voltage regulator. The 12-0-12 transformer converted 230v AC into 12v AC.

The B1 is the bridge rectifier, they need a minimum of 4 amps current / with 100v voltage capacity, output of the rectifier is connected to the capacitor filter section, here we are using 4700uf electrolytic capacitors for both sides (positive and negative side).


This circuit need 2 different voltage ranges, the maximum working voltage of tda2030 IC is +/-18 volt, but the ne5532 op-amp only needs a 12v power supply. In this situation, we add a 12 v regulator for the op-amp, this regulator converts the 18 v to 12 volts.


This circuit needs 2 different types of the regulator, 7812 positive regulator IC and 7912 negative regulator IC. 7812 is capable of producing positive 12 v and the 7912 will produce negative -12 volts.


tda2030 2.1 Stereo amplifier

tda2030 2.1 Stereo amplifier
tda2030 2.1 Stereo amplifier

The stereo amplifier has produced 2 different types of audio signals, namely left and right, so here we need two amplifiers, for this circuit, we are using 2 same tda2030 amplifier circuits for amplifying the left and right channels, they produce a normal sound. 

Different types of active and passive components are used at this amplifier circuit, 10k potentiometer is a dual-type controller, it is used to control the volume of the amplifier circuit (it’s a master volume controller). 


The 10uf/25 v capacitor is a coupling capacitor, it passes the input signal into the amplifier and, it acts as the filter circuit.


The The10k resistor and 2n2 capacitor are connected into a parallel network, it acts as a high pass filter, it will improve the treble effect.


The 33k and 470ohm resistors are feedback resistors, the amplifier gain depends on the 33k resistor value.

The 10ohm resistor and 100n capacitor were used to protect the tda2030 IC.

The output is getting in the 4th pin of tda2030 IC. Power supply pins are 3 and 5.



2.1 Subwoofer amplifier circuit

2.1 Subwoofer amplifier circuit
2.1 Subwoofer amplifier circuit

This is the special part of this amplifier circuit, here in this section you need a subwoofer. 

The subwoofer is a speaker, they produce low-frequency audio signals and the circuit diagram including an extra low pass filter.


The two input signal is connected to the input of the op-amp using 2 10k resistors.


The Ne5532 dual op-amp has been used at this circuit, op-amp configured as pre-amplifier. This pre-amplifier will increase the signal by 6 times.


The 33k and 470ohm resistors were used as the feedback element of the op-amp. The gain will be Depending on this resistor value.


The 10 k, 220n, and 100n 3 passive components are the filters of the high-frequency sound waves and they produce low-frequency sound waves.

This output is connected to a potentiometer, this potentiometer is used to control the bass.

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