Picture of Back Woofer
How to create a simple amplifier from scavenged car stereo parts to put sound into a backpack
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Step 1:

Picture of
I didn’t want to spend a lot of money on parts, so budget wise most my parts were scavenged from a car stereo a friend was going to throw into the trash. I made this so I could have a more portable and convenient boom-box type back pack.

Like this scavenged TDA1558Q from that stereo. (On the heat sink)

I did something like this before by taking the set up out of a gaming chair with the speakers, inputs, and volume control, that was nice but it didn’t have the bass that I really wanted from a portable stereo. My improved version has the bass that I was looking for and has the volume control from the audio input device (i.e. Mp3, ipod, iphone, etc.).

Step 2:

Here are the components that I used:
• TDA1558Q (x1)
• 1k Resistor (x1)
• Red L.E.D. (x1)
• .1 uf Capacitor (x2)
• 2200 uf 50 V Capacitor (x1)
• RCA/Headphone cable (x1)
• Suitable Heat sink (Medium sized) (x1)
• Band-pass Filter
           22 ohm 5 Watt Resistor (x1)
           68 uf 35 V Capacitor (x1)
• Enclosure (x1)
• Wire
• Solder
• Proto board
• 4 ohm speakers (x2)
• 12 V Battery pack (x1)
• Suitable (durable) backpack (x1)

Tools that I used:
• Solder iron
• Drill
• Wire strippers/cutters
• Assorted drill bits
• Screwdrivers (for mounting into enclosure)

Step 3:

The TDA1558 puts out about 22 watts into 2 channels. It worked for the 6 inch woofer that I used, and it handled a mid range or tweeter as well. I incorporated a simple band-pass filter using one resistor and one capacitor for the low channel. The mid range or tweeter was un-filtered on the remaining channel.

Step 4: Schematic

Picture of Schematic
This is my schematic:
gunakti7 months ago
How to connect bass, treble and vol knob on this project?
gunakti7 months ago
Cool man. How u find it.
can you prepare the same is but with bass, treble and vol knob connected.
ToXiCATOM2 years ago
so how does it sound?
I'm glad you asked, it actually sounds really well, better than you would originally expect, i will soon find a way to add a video or a link to a video so you can hear it, thank you for bringing that to my attention