Recently, I acquired a Sony MP4 player which was Made in Japan according to the label. But, I doubted that it is not Made in Japan for obvious reasons. Anyway, the purpose of buying this gadget is to be used in my car stereo as a source of crisp digital music from MP3 and MP4 media format. During my travel to provinces, my gadget was powered from a lithium-ion battery that lasted more than two hours only in which I need to recharge the battery again, once it will be drained. So, I decided to develop a very simple regulated power supply that can sustain the long journey of travel without thinking and worrying of no power supply for the gadget.
The schematic diagram can be downloaded here!.
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