Build a portable speaker for smartphones and Tablet PCs

Sound from the speakers smartphones and Tablet PCs are generally less comfortable to listen to, for me impressed "shrill" voice, this is probably due to the limited speaker design and are made of thin adapted to the size of a mobile device that is small and compact. one way to improve the quality of audio output from your smartphone or tablet PC is to connect it to a portable speaker.Portable speakers in the market are many kinds and designs, but for myself would prefer to make my own that suit for my own taste, at this time I am trying to use a mini amplifier with IC TDA 2003, you can find the schematic circuit --> click HERE. 

because it is portable, it is mandatory to use a battery power supply. battery suitable for this purpose is the battery type Li-Ion 18650, because it has the advantage that batteries have large storage capacity. to obtain the corresponding voltage, two 18650 batteries arranged in series to produce a total voltage of about 8.2 Volts, the voltage of this then it could be used for a resource for mini-amplifier.

for speaker, I used full-range speaker so that the treble and bass can come out, measure the diameter of the 3-inch is enough because if you wear a larger size then the weight also increases, making it less suitable. materials that I use are: plastic jar container tubular cylinder size adjusted to the size of the speaker, I take 18650 batteries from the battery module used laptop, mini kit with IC TDA 2003 amplifier, cable and 3.5mm stereo jack.

design that I use is a mini amplifier mono (one channel), so that the output of a smartphone or tablet PC that used mono stereo, cable to the L and R can be combined. if you want to create a model kit is a mini stereo amplifier can be made with a double and 2 channel speakers for each channel L and R. This is the photo below
The following is a video that I uploaded on Youtube, please click HERE to view it.