TDA2030 TDA2050 LM1875 2.1 Power Amplifier Stereo + Subwoofer

Hello friend, in this post I will share the schematic and PCB Layout for power amplifier 2.1 channel system, using the TDA2030 Chip Amplifier, because of the many requests with the TDA2030 amplifier chip intended for home audio especially 2.1 Power amplifier (Stereo amplifier + Subwoofer Amplifier), I make a circuit and PCB layout that can be downloaded as a PDF file and PCB layout in a Gerber file, which makes it easier to buy PCBs at the PCB manufacturing fabrication. And no less important for list the components I also include in the form of a BoM file so that it's easy to buy the components, you can download the file at the end of the post.

 The following is an illustration of the TDA2030 2.1 power amplifier Stereo + Subwoofer scheme, to see in more detail you can download the PDF file of the scheme:

In the 2.1 TDA2030 Power Amplifier circuit uses 3 TDA2030 amplifier chips, in addition to using the TDA2030 chip you can also use a TDA2050 amplifier chip that has greater output power than the TDA2030. In addition to TDA2030 and TDA2050 you can also use the LM1875 Chip Amplifier, this LM1875 chip is what is very interested in audio listeners, especially the amplifier chip, the sound is typical, more detailed and open, and also more natural than the TDA2030 and TDA2050 amplifier chips.

There are several combinations that can be used for this amplifier, the chip combination can be like this:

1. L / R Stereo Amplifier = TDA2030 Subwoofer Amplifier = TDA2030

2. L / R Stereo Amplifier = TDA2030 Subwoofer Amplifier = TDA2050

3. L / R Stereo Amplifier = TDA2050 Subwoofer Amplifier = TDA2050

4. L / R Stereo Amplifier = LM1875 Subwoofer Amplifier = LM1875

5. L / R Stereo Amplifier = LM1875 Subwoofer Amplifier = TDA2050

You can choose a suitable amplifier chip according to your wishes if I myself prefer a combination of 2.1 Power amplifier which is number 5, namely L / R or Left / Right Amplifier using LM1875 Chip, why because LM1875 is superior in terms of sound detail, clarity and separation the Left and Right speakers are wider, so it is suitable for Left and Right speakers. And for the Subwoofer amplifier, I chose TDA2050 because the amplifier output power is greater than the TDA2030 and LM1875 so that the bass is more pronounced and can be more adjusted. But the combination is my own choice, you can explore it yourself by choosing the combination of TDA2030, TDA2050, and LM1875.

Here are a little few specifications of the TDA2030, TDA2050, and LM1875 Amplifier Chip for 2.1 Power Amplifiers:

TDA2030

Supply Voltage: 12-36VDC

Power Output: 14W

TDA2050

Supply voltage: 4.5-25VDC

Power Output: 32W / 50W Music Power

LM1875

Supply voltage: 16-60VDC

Power Output: 30W

In this 2.1 power amplifier circuit, I have included a Power Supply circuit consisting of a bridge diode, Elco capacitors, and filter capacitors, as well as a dummy resistor and snubber circuit, which makes the Power Supply circuit low noise and low ripple, so it is very good to use for this 2.1 amplifier. The following is the Power Supply circuit diagram.

So you don't need to bother making a Power supply circuit for a 2.1 channel amplifier, just use the output of a stepdown transformer of at least 9-18V AC recommendations, for the use of different Chip Amplifiers you can see the chip specifications above. And in addition to the power amplifier itself, I also added a regulator or voltage stabilizer, the output is stable at 15VDC symmetrically, I use this regulator or voltage stabilizer circuit to supply the buffer and subwoofer filter preamplifier circuit. The following scheme for using the buffer and subwoofer filter:

The buffer circuit is used for audio signal amplifiers that will go into the Left and Right power amplifiers, the gain is the X1 gain, you can increase the gain by replacing R21 and R22, the smaller the resistance value, the smaller the gain, and vice versa if the resistance is getting the greater the gain is also greater.

IC buffer can use Dual Op-Amp: JRC4558, NE5532, OPA2134, AD827, OP275GPZ, and many more important dual op-amps or can also use Dual op-amp discrete.

And for the subwoofer filter circuit, I use my mainstay Subwoofer Filter 4558 circuit, because the circuit is very simple without setting its frequency or phase. So it's like a  Bass Boost or Subwoofer Booster circuit. The output frequency is around 20-300Hz, it is sufficient and very suitable for subwoofer amplifiers. The use of an Op-Amp IC is also the same as a buffer, which is using a Dual-OpAmp IC. The 2.1 power amplifier circuit using TDA2030 / TDA2050 / LM1875 is complete, just install the stepdown transformer and plug the input-output that can be used.

To simplify assembly, I also include the Gerber files TDA2030 TDA2050 LM1875 2.1 Power Amplifier, you can download the Gerber files at the end of the post.

Assembling and test amplifier (Video): DIY 2.1 Power Amplifier TDA2030, TDA2050, LM1875

Download:
Schematic TDA2030 TDA2050 LM1875 2.1 Power Amplifier Stereo + SubwooferPDF
BoM ( Bill of Materials) TDA2030 TDA2050 LM1875 2.1 Power Amplifier Stereo + Subwoofer
Gerber Files TDA2030 TDA2050 LM1875 2.1 Power Amplifier Stereo + Subwoofer