Joule Thief

[mdmiller]

Duane,

First, I need to ask, are you talking about the joule thief with secondary?

either or both depending on the coil.  I'm still messing with some iron wire, the lower ohms works better with it.

Did you ever check out how long the battery lasted or how much drain was going on?

well, I got bored after 48 hours and disconnected it and rewound the toroid into another configuration.  This was with a dead battery for starters and it was still going strong.  My scientific process in probably weak, I don't have your absolutely incredible discipline to keep meticulous notes -- I'm jealous.

I love using a pencil. Did the pencil light up?

no, it was just some 0.7mm automatic pencil lead.  nothing that spectacular -- wouldn't it would be wonderful to create a little mini-arc welder with one of these.  maybe someday ! - Duane

[jeanna]

Here are the results of the little bit of resistor test I did tonight.

I have 3 jt's.
and 1 stationary resistor 800 ohm and that thing sticking up in my pics is a 210 ohm. So it goes from 800 to full on where there is about 1010 ohm.

using the bridge rectifier and 2 voltages here are the results.

minimalist jt  (small only 20 turns on secondary
800 ohm  15V
1010 ohm  17V

The MK1
800 ohm  33V
1010 ohm 36V

The hybrid MK1/jt
800 ohm  25V
1010 ohm 25V
Yes, they are the same with either resistance?

I think there are a lot of factors that go into the results. but, I want to go with higher value on these to see if they will go up any more..

BTW, I still cannot light my 35 led string. The array is 30 leds, but really only 10 in series,

I'm thinking the parallel is the real free ride here. Another thing for me to do is make enough winds for my 30 lights to go on in series. Maybe then I can light the string.

Thank you everybody,
what a great day!

jeanna

[sucahyo]

Hello all,

my replication:
http://www.youtube.com/watch?v=bALrlSxoquQ

Just to mention that tesla flat spiral has better power. The circuit originally used to light up neon and/or charging battery, that is why the transistor is Toshiba 2N3055.

[xee2]

@ timmy1729 

Congratulations on working out where to connect the tube. Great photo. Thanks for posting it. What model camera did the board come from?

You can replace the capacitor with any value, but make sure it has a voltage rating of at least 300 volts. The cap is not needed.

[nievesoliveras]

Hi jesus.

Yes, but we are far more empowered by making something as good with our little toroids and 1 transistor.

No, I haven't lit my fluro with the jt, but I am going to... and more   

jeanna

Thank you for your work Lady Jeanna.

Jesus