Joule Thief

[jeanna]

HEY YEAY YEAY,
I got the string o leds to respond.
These puppys are heavily protected. I think it is amazing they are soo bright when plugged into the wall.

Oh only half will light up at one time. If I reverse the aligator clips on the plug the other half will light. Both sides are lighting very dimly, so I am blaming a resistor.
I seems the base of 2 of the lights is very much bigger than the rest. It is the first of the group that lights or doesn't.
I need to be Ms. Destructo and open these 2 units up.

ooo hoo!!

The recipe for this success is this:

3T,4T,92T MK1
2N2222
220r base resistor
string o leds connected 1 plug prong to each secondary wire to light up half the string.
20.7mA

I also have a 47uF electrolytic cap across the battery leads. This adds a bit to the brightness but is not necessary. A second one in parallel there does not add to the brightness.

I think I will see if I can string these 47uF caps in series and add them to the rail and see what will happen.

2 days in a row!


jeanna

[jeanna]

If I get the chance later, I am going to go for 200 leds on the JT/earth battery set-up.  Wish me luck.

Bill

I anticipate a great video with 200 leds coming out of KY somewhere...

good luck.

jeanna

[Pirate88179]

Jeanna:

Great job on you leds!!!  Soon, very soon, you will have them all lit up.

As for my upcoming experiment, thank you for the wishes, I am not so sure about this one but.....we don't know unless we try right?

Thank you.

Bill

[jeanna]

.....we don't know unless we try right?

Exactly!

And, even when it fails, it is much more fun to try than to just wonder.

jeanna

[Artic_Knight]

do you also have one similar to the experiment you suggested to me ?

i have no problem re-creating the same effect as in this video.
i simply can not tape the eddy current with the way you have suggested me to do.

connecting a capacitor on both side of the tube don't change the speed either.
at least not for me.

sorry it appeared in general you couldnt get it to even slow down in the tube.  i do not have a video of the magnet falling and powering a light but i experienced it. if i can i will get a video.

you should be connecting the gator clips at the top of the tube (entry) and at the bottom of the tube (exit) doesnt matter inside or out. connecting it in this way with nothing but a wire linking the 2 ends together should do fine for getting the magnet to fall at a normal rate.