Joule Thief

[hazens1]

@Hazens,

Would you be willing to share your ebay source for those leds?

thank you,

jeanna

I will never reveal my secrets 

Ha, here is the exact item that I recieved. Still some left. I've tested all 100 and only 3 of them did not work. CCC = Cheap China Crap, but real cheap for what you get    At about 10 cents a pop, you don't feel to bad when you pop a few. Some of the sources on ebay you can get like 500 for less than $50 or I've even seen 1000 for less than $80 before.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&Item=180341278500&Category=66954&_trkparms=algo%3DLVI%26its%3DI%26otn%3D1

Here is a direct link to all of his auctions http://shop.ebay.com/merchant/dxy_dxyduan

He even has 100 watt 6000 lumen element for less than $100. I've seen one of these before and they put out as much light as a 1500 watt halogen 

I dropped the test circuit down to just 15 of them and here is a night time pic of it after running for 36 hours.

[jadaro2600]

@TheNOP,

I've played with the circuit, it's really sensitive.

I'm getting better results on voltage with the Helmholtz style inductors.  I'm able to light a Neon with it, and I'm getting 160v, but there is no secondary.  If I could get ahold of some basic ferrite rods, I could most likely get a great deal more out of the same style of setup.

It's confusing that the voltage on a collapsing magnetic field in an inductor is in the same direction as the current, I would think that there would be a reverse in the polarity, but I guess not.

@all, or Mark

Can one of you with an mk coil, ie, a toroid with three windings, two primaries, and a secondary, try something for me...  namely this circuit.  I'm currently strapped for time, and I haven't made any of these coils just yet.

This is a basic JT circuit absent the power source.  I was wondering if adding the blue path would increase voltage readings on the secondary ( orange ).

[xee2]

@ jadaro2600

It's confusing that the voltage on a collapsing magnetic field in an inductor is in the same direction as the current, I would think that there would be a reverse in the polarity, but I guess not.

The direction of the current flow in the coil does reverse when the magnetic field collapes. Look at the direction of your diode. The voltage polarities across the collector coil must be reversed for current to flow through the diode in that direction.

I think you know enough math to understand the following. This explains why you are not getting more voltage across your secondary coil.

where:

Vp = voltage of pickup coil
Vc = voltage of collector coil
Np = turns in pickup coil
Nc = turns in collector coil

If the pickup coil and the collector coil are assumed to be two coils making up a transformer, then standard transformer theory gives the following equation

Vp / Vc =  Np / Nc

which can also be written as

Vp = Vc Np / Nc

Therefore the pickup coil voltage will never be higher than the collector coil voltage unless it has more turns than the collector coil.


.

[hazens1]

@ Hazens1

I have tried to replicate your 7-7-70-70 1 inch coil with no luck, I think due to the fact that the wire is all the same color, so I must have crossed something.  Could you post some additional pictures so I can see where everything is going? 

Thank you very much

Pics of that coil can't get any better than what is already on here. Have you made the 7-7-70 first before adding the second Pickup coil? If you can get the single Pickup version working, the 2nd Pickup should not be very hard to add. Getting some colored wire definately helps. The link I posted before for the newbie wire is really good and cheap wire.

The pic below shows a pretty good shot of a 10-10-80 which is wound the same as the 7-7-70 just with a different toroid. Shows where everything hooks up.

[nievesoliveras]

@all

It seems that there is a race of how much voltage you can produce. That is cool, but it is not what we need now.
The race should be about how much voltage I can feedback to the source battery from my coils.

Then when you can maintain your configured circuit working with its own produced energy, you can use it to keep the voltage you have attained working for as long as the battery resist the process.

Lets race for the retroalimentation of the joule thief first.  We have the voltages attained already.
Remember this is just my opinion and I could be wrong.

Jesus