QUOTE(Boffin01 @ Aug 19 2005, 10:08 AM)
Dinster, dudes and dudettes,
Fake Magnetic LED torch/ Kinetic LED torch/ Faraday LED torch.
I was curious enough to butcher one open and I found the following:
1) PCB got holes for diodes to rectify the coil's output but no diodes was found.
2) Output of the coil was shorted out on the PCB.
3) The magnet that moves inside the coil was not a magnet at all.
4) The power to the LED is supplied by 2 CR2032 coin batteries.
No way you'll ever get any kinetic energy coverted into electrical energy macam ni.
I googled but found no mention of a fake magnetic torch so we found it here on LYN first!
Buyers beware.
Many thanks,
Boffin01
What this guy says is extremely true, i support his statement.
Curiously, i also have one of these last time, i know some of the kinetic torch did not even had any component on the circuit board, but mine does have a high capacity capacitor (0.47F, considered extremely high capacity), apart from the 4 1N4001 diodes. No, i don't buy this from the forum, but from your momma's grocery store, because i can actually see something in the circuit board.
Now the fun part. I dismantle it and found two button cells totalling 6v (usually ~4.5v is enough to power up a white led). Since the voltage is too high, the diodes were there to decrease the voltage to ~4v.
And as a experiment of the charging capability as claimed, i took out the battery from the torchlight, then i empty the capacitor off any remaining charge, took nearly 2 minutes. (like i say, it's a huge capacitor.) Then i shake the torchlight vigourously, yes, i do look kinda weird, but this is for the sake of science
My observations?
1) You can't produce enough power to light up the torchlight as you shake.
2) After shaking for 5 minutes non-stop (good exercise), you can light the torchlight, but it's very dim, kinda like a nearly dead torchlight. You can't do anything useful with the light.
3) Further shaking produces no significant change to the brightness.
Don't ask me the voltage level and stuff, i don't have a voltmeter that time.
the manufacturer's claim is totally bullsh*t because you can never produce enough energy to operate the torchlight. And they just hope you don't really finish up the 2xCR2032 battery in a few year's time, which is quite true, if you're not a torchlight maniac.
My bottom line: The torchlight is still worth the price. 2xCR2032 already cost more than rm10 in the first place. Just to compare penny to penny, it's still worth it. The led is quite bright, it will last you years without replacing the batt, who cares if the circuit works?