Joule Thief

[jeanna]

@Mk1

How is the primary and secondary hooked up?  Can you please provide a complete pic like the one above?

If so I will make an Mk x2 this weekend

Hi stprue,
Mk1 has not answered yet. I know he got some new toroids to try, but I am sure his first and really good one so the kind he recommends is the kind like my "filter"

Mine is not as crazy good as his, but it is way good. And it is better than all my others.

I posted 3 pics a few pages back and the filter was the middle one.

I am also curious about this new one of Mark's.

If MK1 is gone for the evening, I can perhaps put together some of his directions for making the MK1. I have put them together for myself.

I need to eat lunch. It is 4 PM and I will do this a bit later if MK1 hasn't done it by the time I get back.

jeanna.

[resonanceman]

I have been  trying to  tune my MK2

I have decided  that I don;t know  what I am doing


I have  just  been reading the  voltage across the LED


I have  removed  several  windings from each leg .....I am still getting the same   voltage.
1.384      after  thinking  about it for a while .....it seems to me that all I am reading is the  voltage the  LED  is  operating  at .


Can someone  explain  exactly  what to measure when  tuning  the windings.

Thanks

gary 

[Mk1]

@all

Page 478

Right now i am trying to replicate the mk1 high voltage on my new toroid.

The x2 is made to replace the regular mk type coils.

Mark

[resonanceman]

I have been  trying to  tune my MK2

I have decided  that I don;t know  what I am doing


I have  just  been reading the  voltage across the LED


I have  removed  several  windings from each leg .....I am still getting the same   voltage.
1.384      after  thinking  about it for a while .....it seems to me that all I am reading is the  voltage the  LED  is  operating  at .


Can someone  explain  exactly  what to measure when  tuning  the windings.

Thanks

gary 

I am  trying  it again   with a  diode bridge and  cap 
I will  be measuring  the  voltage  at  both  extremes of my pot . 

[Artic_Knight]

i was looking through the tesla patents and there is one that definately shows a joule thief curcuit..  it showed a mechanical rotary switch that made contact with 2 coils side by side that became one wire then went through a dual coil step up transformer! very interesting looked like there was more than needed to solve the issue he wanted which was a high frequency high voltage transformer power supply.  very similiar to the work here. i found it in a book store if i remember i will get the patent number as i could not locate it on a quick search here.