I got a recent jobless friend who was very creative as he found himself doing something out of pvc pipes or plastic tubing that is usually found under your kitchen sink. He created a powerless but amplified speaker for smartphones, it works just like it does have a preamplifier only not much higher volume can be achived. So basically what is a preamplifier? Its an electronic device that amplifies a very weak signal or volume.
Anyway, back to his product. Not only he does something worthwhile but of course he can make these as a sort of income for the time being as he sold it to his friends like me who loves music. BTW, he sells it for only P250 bucks! 😀