Joule Thief

[Mk1]

They probably could care less about what anyone here is doing.

Well thanks , it is just as good !

At least there is people reading , and showing them self up from time to time .

Like you i might ad.

And what the jt is not risky like a toroidal power unit ?

I still have not seen one tpu , worth mentioning , but people sure talk about it !

Mark

[electricme]

@MK1
It is very important.

@all  ******this is important ******
Ok i will tell you about what a motor told me, a motor has 2 coil like the jt

I was using it like a generator to light led , so i connected the led directly on the motor lead , started rotating the motor shaft by hand , the led got bright right away , but i also notice the the shaft was not rotating easily now , not easy like when nothing is connected to it, then i use a coil on the negative led leg , the led got just as bright but the tension in the shaft was gone. I don't know what the coil did, how it could do so , maybe delaying the feedback , or changing its pole , choke effect ?

Ok now why did i tell you about this , well because if you load one of the pick coil with a big cap the the other pickup coil will show charge cap voltage, like in the motor experiment the jt get loaded back .

So now i suggest making a system that load back the toroid ,

Mark

Mark, this is very interresting, I read on the net somewhere where a motor has a dragging effect as the pole piece passes the magnet, I couldn' understand it, but you coil seems to have an effect to punch through a dragging magnetic field.

Could you do a quick pencil drawing of your hand crank generator with the coil and LED setup and send it to me please, I would like to replicate this.

jim

@Resonanceman
@Gadgetmall
That was a good find , the Star LEDs that is, my single 1Watt Luxeon Star LED cost me $12 so a 10 watter is rather cheep at your prices.

I agree, these bucket leds are going to make all fillament lights redundant in a couple of years.
There is a circuit to power this stuff just below, mabe we can modify it some watt.

If you want to test one of theses in a JT, it is a good idea to add a 220 ohm resistor or use a 500 ohm pot to experiment with until you are familier with this device, but I can connect it to my JT directly and it works just like an ordinary LED.


I made a post about these Star LEDs about 25 pages back, and only 1 person picked up on it.
   
jim

[Mk1]

@electricme

This is how i discovered it .

Also you really need to see this , i would not charge a battery but use the high amps pulse in a bigger toroid.

http://www.youtube.com/watch?v=kGVDt9MbaKE

[Thaelin]

MK1

   Think you will find the coil changes the phase angle of the current
so it lags the voltage a bit more. Therefore it drags less.

thay

Gadget:

   I am already tired so I see no reason what so ever to be "Re Tired"   

[jeanna]

Oh I love the smell of rain on a hot dry world. Soo refreshing.

Hi again everybody,

I just removed the steel bolt core from that NS generator I showed you all yesterday.
Remember it has 360 turns of 2 kinds of wire and the cu wire is twisted to the fe wire beginning to end like all primaries of regular joule thiefs.
It had a secondary I wrapped but who knows how many turns but it is surely a step down transformer.

I am using the 2N3055 from this afternoon's tests.
With the steel bolt inside the voltage across the pick up was 3.63v at 41.6KHz with the light in the bjtl spot. Just like yesterday with the 2N3904.

After I removed the steel bolt the voltage across the pickup  was 4.14v when the resistor was around 90r and the frequency dropped way way down to 7.57KHz .

That is a major drop in frequency for that little (0.75vvolts) change in voltage.

Then I remembered that the radio shack mag wire spools fit over this. I could only fit it over the bottom where the turn around is for the wires, but the voltage popped up to 35.9v @ 2.77KHz

Oh the other thing. I could not remove the light.
The circuit died when I did.
That is probably because the 2N3055 needs it for something and the 2N3904 does not.

So, the steel has a lot to do with keeping the frequency high.
This is probably a complex proportional thing with 360 turns changing from a steel bolt to an air core but there it is.
I think this is a big difference.

I found the ferrite rod and it is too fat to fit into the straw. Darn.

Now, I will go back and answer those questions I missed...

@MK1 - that is pretty interesting with the motor and led and transformer.

jeanna