Joule Thief

[gravityblock]

Deleted, sorry

[jeanna]

Did you read post #10392 about "k"?  Apparently not.  It has nothing to do with flux density or saturation.  It has to do with how the flux is distributed in a ferromagnetic material due to spatial frequency, unless "k" and "K" are different.

GB

Yeright I didn't.
I saw the video then didn't get back.
If you look at the post just above the one I am quoting you will see the calculator from georgia state physics dept website called hyperphysics. (I have spent many hours there.) It is the K that they are referring to that  I was asking about. I believe it is not the same thing you are talking about...

but...


And true to the form of this wonderful joule thief topic, someone... you in this case... comes up with something really new and wonderful to stir into the pot.

So, thank you for the reminder. I will look at this.

jeanna

[xee2]

I do not believe it needs to be 3 inches to work.
I bet 2 inches OD with large enough core diameter will be fine.

2" cores will work. If you can find my old posts, you will see that is what I used first. But I changed to the 3" coil because it is easier to wind. The 5 for $1 Goldmine cores will light a fluorescent tube. It is to bad that the 3" cores are no longer being made. I was hoping that Gadgetmal would stock them.

[sparks]

Anyone try lighting a flurescent by just taking the output wire and running it alongside the florscent tube.  Helps if you place a cup of water down one end of the tube for an antennae termination.  No need for a pesky filament to burn out or heat up.  Funny thing about electrons is as they are accelerated they have a doppler effect to them.  The electron appears to be radiating a frequency like a train blowing a whistle.  As the train comes towards you the frequency of the waves observed by your ear rises.  When an electron is accelerated the doppler effect makes the electron emit xrays.
As electrons are accelerated out of the mass of the antennae wire lying next to the tube they emit highfrequency emwaves.  These emwaves are adsorbed by the gas inside the cfl which reradiates an emwave of lower frequency usually a greenish light.  The florescent coating on the inside of the tube absorbs the emwave energy and transmits a more pleasant light with a wider bandwith due to the types of coatings used.  Cool white bulbs.  Mr.Tesla use to do light shows long before they became popular in the 60's.  In the ceiling he would place a length of wire.  Then by adjusting the frequency of the "cold cathode" he would cause different wavelengths of em energy to be produced.  Different bulbs would have different density and types of gas in them which would absorb the emhighfrequency as it was modulated over different freqs.  The filamentless flurescent bulb has been patented and buried for quite awhile so GE can keep selling them there dinosaurs to homedepot and you.

[gadgetmall]

These are some he has bigger ones also . I bought two from him. Make sure they are Grey and ask him to stick a Magnet on them . He has some red ones . They are no good . These are Magnetics cores . I may have got the only 3 3/8 . Not sure
@Bill Grab them !!


http://cgi.ebay.com/IRON-POWDER-TOROIDAL-CORE-3-OD-1-7-8-ID-1-THICK-4PC_W0QQitemZ380181228376QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item5884912b58

http://cgi.ebay.com/IRON-POWDER-TOROIDAL-CORE-3-OD-1-7-8-ID-1-THICK-2PC_W0QQitemZ380181227996QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item58849129dc

http://cgi.ebay.com/IRON-POWDER-TOROIDAL-CORE-4-OD-2-1-4-ID-5-8-THICK-2PC_W0QQitemZ360211219044QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item53de430264