Joule Thief

[Pirate88179]

Bizzy:

I posted a source for 4" OD ferrite toroids a few posts back.

Bill

[Bizzy]

Bizzy:

I posted a source for 4" OD ferrite toroids a few posts back.

Bill

Hi Bill
Was that goldmine?
Its smetimes ahrd to find a great post after you read it becuase so many are added afterwards.
thanks
Scott

[NickZ]

 
   Bill and All:
   Thanks for the reply.  The reason I asked is because I have noticed that for me, using a secondary with the Yellow Pc toroids does seam to affect the duration on the batteries, in a negative way.  The same coil wound with a secondary does not keep up with the battery run times, compared to ones with only a primary, using the same leds.   SkyWatcher who also made several days or weeks of tests, also mentioned something about lower run times when using a secondary. As also that the bigger the torroid the higher the battery charge consuption.  I realize that tuning is also an important part of the process, and that the best highest perm Ferrite toroids are the ones to use. But for those of us that can find them, the Pc toroid can be made to work, ok, not great, but are very usable. 
   Has anyone had luck with big air cores???
   I have watched all of Jeanna's video that deal with the subject, and most of Marks, yours, and everyone elses.
   It would mean that 100 leds can last the same amount of run time on a secondary, as one led does on the primary. I don't think that that is the case.  That is still my question...
   If anyone else has noticed this, please comment, as I think that it is an important point. 
  This is also being tested elsewhere, but only on the secondaries output voltage, compared to input voltage, not duration or run the times, which is just as important. 
  The leds themselves are all different also, plus they do dim after weeks, or months of use, by as much as 50%, especially the cheaper ones from China.  So, you get what you pay for.
                                              NZ

[NickZ]

   Maybe we can get a more recent opinion from Jeanna, also.
What happened to her?  Did she hit on something brilliant and is not telling?
                                                                               

[crowclaw]

@NickZ
A JT circuit will work ok... air core. This post way way back was a TV coaxial flylead wound around a vodka bottle (Season joke) the coax lead worked without it as well as the bottle was only glass. The two coils of the JT circuit was simply the outer braiding or screen and the inner of the coax!! Go back to this posting to see my Pic's and scope shot's.
« Reply #12257 on: January 29, 2010, 02:11:54 PM »

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