Joule Thief

[innovation_station]

i just put a 33 ohm resistor on the  pos side of the battery ... my out put went from 240vdc to 15v .......

hummmmm

i wound 2 50 turn coils .. 2 jt

ill fill the ring with 50 turn coils split at the half way point

ist!

from 1 coil i can get 5 diffrent voltage readings ..

165 v 100v 54.9v 16.5v 177v

all from a 50 turn coil ...


i found 2 the same cell fone batteries ..i will hook them up to a charger ring so i can have 7.4 v supply to use with a 3055 from a aa

ill do this today ..

[altrez]

@all

So hard to keep up with you all I have been so busy with work that I have not had time to post! Keep up the great work everyone!

-Altrez

[dllabarre]

I'm just trying to understand this JT circuit in detail.
Why do we use a Toroid instead of a straight ferrite core coil?

Why do some people use 2 of the same size wire to wind the Toroid and some people use different sized wire?  What is the different effect?

Thanks,
DonL

[xee2]

@ dllabarre

I'm just trying to understand this JT circuit in detail.

Then I think you have come to the right place. There are over 800 pages here of tests, explanations, and opinions.

[resonanceman]

I'm just trying to understand this JT circuit in detail.
Why do we use a Toroid instead of a straight ferrite core coil?

Why do some people use 2 of the same size wire to wind the Toroid and some people use different sized wire?  What is the different effect?

Thanks,
DonL

Don

Pretty much anything  can  be used as a core for  a JT
A toroid   is used  because  it  keeps  the  magnetic flux within itself .
With a solenoid type  of  coil   the magnetic  flux has to leave one end of the coil   travel through the air back to the other end  of  the coil .  .........in theory this is  much less efficient .

The people here all  follow   their  own  understanding.
They learn  different  things about the JT ......they   have different  prioritys .
A  well made well tuned  solenoid style  JT might  out preform   a toroid  based   JT that is not so well  tuned .
I  started  expermenting   with non   toroid JTs  after  spending some time  researching  toroid s  and  where to buy them .   The  information  on   toroids is  limited  and  hard to  understand .
I decided   that the ideal  JT would   be one  without  a toroid that  others may or may not  be able to  get .



The  wire  size thing may  be do to many  factors
A  common  reason  for  using  a particular  wire is  because that wire is on hand .
I use  a twisted pair   of wire   from a cat5 cable   for most of my  primarys ..... because I have plenty  of that kind of wire .......and it works for me .....

A  couple of reasons for using larger  wire  is  if you are planning  on using  higher power .........or  if  resistance  is an issue .     I have found that resistance  is more of an issue  on the  coil  going to the  transistor base  than the other  coil .


gary