OSDev.org

I just browsed youtube videos and found videos from a guy nicknamed "Household hacker"... omg. I laughed how much people did tried his "experiments"... it's just funny and sad at the same time.

First culprit, "How to power a TV using an AAA battery", http://www.youtube.com/watch?v=0rA-zhTJ ... re=related

Firstly. 1,5V DC versus 230 volt AC? Oh god.
Next, this experiment would work if you had 154 fully chargen 1.5V batteries and a alternating-current generator (may work on DC though), but the TV wouldn't last on for long. Max. 10 seconds.

Second culprit, "How to create a High def speaker under a buck",
http://www.youtube.com/watch?v=8m8fbnSh ... re=related

No way - this wouldn't work. A normal speaker needs permanent magnets, coil and a diaphragm.
Plus, you can easily short your hi-fi amplifier and blow it up

Third foolishness, "Make your own iPod taser"...
http://www.youtube.com/watch?v=nLIvZ20jhbQ&feature=user

Jesus Christ... a person what would even ATTEMPT to build this is just mentally retarded.
Out from the 3,5mm jack connector (the one from your headphones) comes no more than 3 volts... (For non-believers: You'll make a better "taser" if you stick your arse directly to your outlet.)

Fourth wave... "how to charge an iPod using a onion"
http://www.youtube.com/watch?v=GfPJeDss ... re=related

I think the onion produces just too few voltage to *recharge* the iPod.

Well, at least we see how stupid can people get

But weirdly as a response to his high def speaker thing, there was an answer, where it seemed to work, but had a very low sound...
http://www.youtube.com/watch?v=kGT95ALp ... re=related
Might be a hoax too..
I can't find a way to explain why it would work...
Jules

Well, if that "speaker" doesn't have a magnet, it WOULDN'T work.

BTW I've tried to put in a headphone jack wire right under two HDD magnets, then I did take a plastic cup right to the magnets and I heard the music.. well, but very very quietly. It sounded like if you would hear somebody's "button headphones" (the smaller ones) 0,5m away from your ears.

The link which the "speaker" works, is here: http://www.youtube.com/watch?v=nk_LPxkC ... re=related

The final "speaker" does give some "serious bass", doesn't it?

Anyways, this'll work, I'm perfectly sure:
http://www.josepino.com/other_projects/ ... peaker.jpc

It is also possible to make a tweeter/mid-range speaker using flexible capacitors, and no magnets. Sony made some like that, 20 years ago.

And it's not that hard to use a flyback DC-DC converter to boost 1.5VDC up to any voltage you want. Your MP3 player uses a synchronous boost DC-DC converter. Your cell phone probably uses a buck boost converter.

Yeah, you can "boost" 1.5V, but you'll end up quickly as you'll lose amperage (current). What's a point of having 400V with 0.00005 uA?

Well, typical DC-DC conversion efficiency is about 80 to 95%. So from a 1.5V AA cell, you could get about .5 milliamp at 400V. All LCD screens use an inverter to boost 12VDC to 600 or 800V with enough current to power the cold-cathode flourescent backlights. So it's not as bad as you make it sound.

this guy is hilarious he actually made some of the commenters believe it works. his ideas are very creative