How to DIY a An Amplifier for a Subwoofer

[vc_row][vc_column][vc_column_text]how to make an amplifier for subwoofers

Imagine feeling the bass of your favorite songs rumbling through your body as you are rolling around town or taking a road trip? It definitely makes your driving experience much more enjoyable. To get that experience, you’re going to need system that has a subwoofer and an amplifier. A lot of amplifiers have hefty price tags, so you might be wondering how to make an amplifier for subwoofers on your own.

If you’re looking to shave costs, or you just want to tackle the project of creating an amplifier on your own and enjoy a great sense of pride as you’re listening to those awesome sounds, you’ve come to the right place! In this guide, you’ll learn how to make an amplifier on your own that rivals the best car amplifier subwoofer on the market.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column][vc_column_text]

Gather Your Components

In order to build an amplifier for a subwoofer, the first thing you need to do is make sure you have all of the components you’ll need for the project on-hand. The components we suggest include:

  • An LM 386 semiconductor
  • A 220 micro Farad capacitor
  • A 100 micro Farad capacitor
  • A variable resistor with 5 kilo ohm
  • A resistor with 10 ohm
  • One .01 capacitor
  • One .047 capacitor
  • A 9 volt battery and the accompanying battery clip
  • Wires
  • 2 3.5 mm stereo jacks; one male and one female
  • A project board; however, if you prefer, a dotted board and solder will work just fine

All of these components can be purchased at your local electronics store. They are very common, so you won’t have to worry about searching high and low to find them.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column][vc_column_text]

Positioning the IC

Once you have all of your components gathered, the next step in the process is positioning the IC. In order to do this, follow these steps:

  • Put the LM 386 on your project board
  • If you place the IC so that it is in front of you (you should be able to read the words printed on it), the pin number on the lower left side is 1; pin numbers increase in a counterclockwise fashion.
  • Use a wire to connect the third and fourth pin together; the GND pin.

Connect the .01 Capacitor

Next up, you are going to connect a single pin of the .01 capacitor to the second pin on the IC. You should join your other pin on the capacitor with the input.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column][vc_column_text]

Create the Gain Controller

The next step in the process of making the best car amplifier is connecting the gain controller. To do this, you have to join the first pin of the IC with the A pin on the 5 kilo ohm variable resistor. Bring together the A pin of the variable resistor with the C pin. Finally, you are going to need to connect the eight pin on the IC with the B segment of the variable resistor. Once this process is complete, you will have the gain controller.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column][vc_column_text]

Create the 100 Micro Farad Capacitor

For this step in the building process, you will have to connect the positive VE side of the 100 micro Farad capacitor with the sixth pin on the IC. You want to connect the negative VE side of the capacitor with the fourth pin on the IC, also known as the GND pin.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column][vc_column_text]

Connect the OHM resistor and the .047 Capacitor

The next part of creating your own amplifier for a subwoofer involves connecting the OHM resistor and the .947 capacitor. To do this, you will need to connect the fifth pin on the IC to one side of the 10 OHM resistor. You want to join the other side of the resistor with the first pin of the .047 capacitor. The second pin on the capacitor needs to be secured to the fourth pin on the IC, or the GND pin.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column][vc_column_text]

Make the Volume Controller

The volume controller is an integral part of an amplifier. If you want to create the best amplifier for subwoofer, you really want to make sure you get this part right (not that you don’t want to get the entire process correct). To create the volume controller, connect the fifth pin on the IC with the positive VE side of the 220 Micro fraud. The negative VE side of the 220 Micro fraud to the A on the 100 ohm variable resistor. You want to connect the variable resistor’s B pin with the GND pin, or the fourth pin on the IC. Once all of these parts are joined together, the volume controller will be created.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column][vc_column_text]

Make the Input and Output

This part of building your audio amplifier involves two steps.

  • Bring the positive VE pin of the female 3.5 mm stereo jack with the C on the 100 OHM variable resistor. You want to make sure that the female jack of the GND is connected to the GND of the IC, or the fourth pin on the IC.
  • Connect the positive VE with the male 3.5 mm stereo jack with the opposite side of the .01 capacitor. Link the male jack’s GND with the GND on the IC.

Test It

Now, the point in the building process has finally arrives: testing out your audio amplifier. To do this, join the positive VE on the 9 volt battery with the sixth pin on the IC and the negative VE of the 9 volt battery with the fourth pin on the IC.

Once you do that, you can test the amplifier out. To test it, connect the male jack with your audio device and the female jack with the speakers. Go ahead and adjust the volume and gain controllers until you get the sound you are looking for.

And that’s it! By following these steps that teach you how to make an amplifier for subwoofers, you will be able to have an incredible audio sound system.[/vc_column_text][/vc_column][/vc_row]


Troy is a freelance sound engineer with over ten years’ experience in the music industry. His passion for music started when he was young. He would often be found dismantling old radios or television sets and fixing them. Troy is renowned for hosting some of the best live concerts in his hometown. When not working, Troy loves taking his thirsty Ford Mustang for a long drive in the wild. He has been married to Jane for the last 20 years, and together they have two lovely girls. His also known for his delicious, honey coated, barbecued pork chops; which he prepares in his backyard.