Subwoofers can be categorized into active and passive models. The latter doesn’t have an in built-in power, meaning they require external power to function.
A subwoofer amp acts as an external power supply to your sub that enables it to produce accurate low-frequency tones as you play your favorite tracks in your car audio system.
Instead of purchasing a brand new best 5 channel amp, you can make one from scratch and, thus, save some cash that you can spend on other important things.
In the following tutorial, we’ll teach you how to make a fully functional subwoofer amp at the comfort of your home.
Things You’ll Need:
As you can easily guess, you’ll need a number of electronic components for this project. these include the op-amp chips, transistors, resistors, diodes, RCA jacks, fuses, and so on.
You can get the necessary parts by buying a self-assembly amplifier kit or you can salvage for the different parts separately. which way to go is entirely up to you…if you’ve never done amplifier construction before, consider going for a complete assembly kit. if you want flexibility with your specifications, consider purchasing the different parts individually.
You’ll also need a schematic—kind of the amplifier circuit sketch to show you the layout of different parts of the amp. the self-assembly kit usually comes with a schematic included in the package. If you don’t get one, you can use a generic power amp schematic for reference.
Not to forget, you’ll need the soldering iron and a PCB (printed circuit board).
Once you have gathered all the necessary components, follow the steps below to start creating a subwoofer amp from scratch…
Directions To Follow:
Step 1. Mounting the electronics on the circuit board.
The first step involves loading your circuit board with the necessary components (use the schematic as your guide). Typically, the components that go to the board include the resistors, transistors, fuses, op-amp, chips, diodes, heat radiator, and the audio jack.
Load each of these parts correctly onto the circuit board as indicated in the schematic. Be sure to push each component through so that they protrude on the other end of the board.
Once you have fully loaded the components in accordance with the wiring circuit diagram, flip the board, cut out excess wires, and then solder the connectors to the board metal strip. Solder the circuit board inside the board chassis.
Step 2. Loading the transformer and power supply.
Next, you’ll need to load the chassis-mount components onto the circuit board. these include the IEC power supply, power transformer, and the potentiometer.
Locate the large square-shaped pre-drilled holes on your PCB chassis and slot the power transformer right in.
Line up the solder lugs to ensure they’re level with each other.
Now solder the primary winding to relevant point (as shown in the schematic) on the circuit board.
Load the power supply and solder the red and black wires to the positive and negative eyelets respectively.
Step 3. Loading the potentiometers.
Fit the potentiometers to the pre-drilled holes on the front part of your chassis.
Cut a piece of ground wire and a piece of power wire for each of the potentiometers. Strip ½-inch of the ends of each of these wires.
Solder one end of the power wire to the output terminal of potentiometer.
Solder the other end of the ground wire to the correct eyelet on your circuit board.
With the potentiometers in place, you can now fit dials and line them up (the dials) such that the zero stays at level with the indentation on the pole of the potentiometer.
Check this video on how to come up with a subwoofer amp at home:
Testing Your New Amplifier
Congrats! You have just made a subwoofer amp from scratch and saved yourself a significant amount of cash.
Now, it’s time to put the subwoofer you have created to test. Hook it up to your subwoofer, just the same way you connect a store-bought amp and see how it works.
If you did everything right, as explained in the above steps, you should end up with a fully functional amplifier than powers your sub to produce quality low-frequency notes.