I made this project after seeing ASCAS Instructable. I wanted to make my own version that had a louder output and was more simpler by eliminating the need for a separate aux jack. In this case the aux jack for my project is attached already to the bluetooth module. This Bluetooth boombox has a simple interface and is easy to use. All you have to due is let the battery charge and then connect it to your phone and start blasting some tunes.

Specifications

Dual 3w 8ohm speakers [ohm doesn't really matter ]

15m bluetooth range

audio jack and any type of cellular device

portable and uses a 3.7 to 5 volt rechargeable battery.

Also if you enjoyed this project please vote for it in the contests that they are in. Thank You

Step 1: Materials

The price bill in total come up to 10 dollars or so.

The speakers I used are salvage from an old boombox from like the 90s. It was in quite bad condition so I took the speakers before I threw it out.

Lithium Battery Charger $2.50
Amplifier $3.77
Bluetooth Module $4.83
Some Wires - free
Salvage or bought speakers[You can use one or two speakers]
Enclosure [I used an old pencil box]
Phone Battery

Step 2: Step 2: Placement

Okay first thing I did was create holes in my housing unit. I did not have any official tools like a saw or cutter so I had to do everything with a scissors and pliers. I pretty sure if you have the proper tools you could make your holes way more neater.

Then I placed the speakers in the holes I made for them and hot glued them. Make sure that their are no air gaps because you don't want the speakers to be losing sound. Also not pictured is holes for the switch, audio jack and charger.

Step 3: Step 3: Solder Components

The original circuit here was contributed to ASCAS. I made some minor changes to make it easier for me to make, read the notes if you wanna see how.

For the aux cable jack instead of cutting off the aux end I just solder the wires directly on to it. The Tip is the left line, the middle is the right line, and the top is the gnd line.

Then I solder terminals on to the lithium charger which I then connected to the battery. As you can see you can kinda get away with messing up the plastic housing. But please do not allow the soldering iron to sit for more than 10 seconds on the terminals or it can blow up or be badly damaged.

Then I solder on the connections for the switch and finally I solder all the connections onto the amplifier board.

Everything is ready to be put in place and start blasting some tunes.