Joule Thief

[hazens1]

@Hazens,
good job. 25 in series.
Did you stop when the lights dimmed?
Soon we will be able to light those christmas strings from our own wound toroids!

jeanna

Here's 58 in series. Dropped the resistor down to 500 ohm, everything else is the same. Brightness is about half compared to the 25 in series.

[stprue]

Where did you get the good deal on those leds again?

[dog812]

There is tons of LED's on ebay.. That is where i get all mine for my hula hoops.

Nice work hazens.. What parts are you using in that JT?

[jeanna]

@Hazens
Fantastic. 500 ohm. not bad. I bet the amps draw on that battery is no too bad either. Nice.

@All,
I decided to make a sketch of how I have connected all the wires in the 2 tier arrangement.
I made this for myself to help me wrap my head around what is happening.
There are 3 coils of wire going around 2 toroids.
Only one transistor is needed.
I lowered the resistor because there was not enough light. Now, I may try to raise it again, because it is quite bright. It is lighting 2 leds in series in 2 related, but separate places.

I just want to have you all get a look at the crazy way the connections are here. This produces the best light, however, there are many ways to get light out of these wires when the first tier is put into the second tier as a complex source.

Remember, there is no separate battery, no transistor, and no base resistor on the second tier.

I did one thing which gave a surprise which I need to follow up.
I had made just 1 turn around the second tier toroid to free up the real secondary wires to test them.
Then, just to see,  I used that single turned wire in place of the other and yup it was way bright. I think brighter.

That is when I decided to ask you to have a look.
Maybe the turns differential going way down on the second tier will be advantageous.
Ah more questions than ever.
Please have a look, and I invite comments. (be kind )

jeanna

Red and green are secondary wires, purple wires are the second tier primary bifilar.

EDIT
The vital stats are
220 ohm
125 KHz
59 V
measuring the 80 turns green second tier secondary wire ends while the single turn is in making the bright lights brighter.

[hazens1]

Nice work hazens.. What parts are you using in that JT?

Here's a diagram.