Portable Power

[salahaldeen]

First of all, thanx for EVERYONE in helping me out in designing a good circuit 5 to 3.3V

 

[audioguru2]

It sounds like you are making an MP3 player with a hard drive. I fixed one from four that were found in the garbage at a stereo store. It is about 3 years old, it is huge and heavy and its four AA Ni-MH battery cells last about 2 hours. It uses the 8GB hard drive from a laptop computer.

Look at a modern Apple ipod nano MP3 player. It also has a 8GB hard drive, is tiny, is lightweight and its rechargable lithium battery lasts all day long.

MP3 players use RAM instead of hard drives today. They are very small.

 

[salahaldeen]

yes actually, it has an HDD and MMC to be activated with.

I was having ideas of buck or boost converters, but still I need to keep searching.