Joule Thief

[resonanceman]

@all

This is old stuff but there it goes .

The 4 jt coils are made of 12 turns of 22 gauge bell wire. There is also two secondaries of 24 turns up and down over each half.

If my memory is correct i got about 70 volts per secondaries .

Now this showed me that sending 2 kicks in one toroid is not that simple because the pulse from one can trigger other transistor out of time even if they are not connected to battery , i tested with one led on each side i can remove any one of the two transistor and the circuits keeps going both led are really bright.

the yellow and red work together and blue and green work the other transistor.

MK

This may be old to you .......but  it is new to me     

I do  remember  seeing your  winding configuration   picture  when I was new here .
It  was way beyond  me at that time .



Did  you  try  hooking  the  coils  up in other ways ?   such  as Red/Blue   then  yellow /


green?

I am  not  sure that   yellow /red       blue / green  would make  a rotating field


I am  glad to hear that  the feedback from one is enough to drive the other .
My feeling is  that it might be possible  to run it with  just one transitor .......but that may defeat the purpose .   In my opinion  the 2nd JT  would mostly  be  just  flyback  coils .

I  think  the  rotating   field  is the key ..... I think  if  we can  get  the  coils to fire in sequence  around the   toroid  we will have it .


gary

gary

[Mk1]

MK

This may be old to you .......but  it is new to me     

I do  remember  seeing your  winding configuration   picture  when I was new here .
It  was way beyond  me at that time .



Did  you  try  hooking  the  coils  up in other ways ?   such  as Red/Blue   then  yellow /


green?

I am  not  sure that   yellow /red       blue / green  would make  a rotating field


I am  glad to hear that  the feedback from one is enough to drive the other .
My feeling is  that it might be possible  to run it with  just one transitor .......but that may defeat the purpose .   In my opinion  the 2nd JT  would mostly  be  just  flyback  coils .

I  think  the  rotating   field  is the key ..... I think  if  we can  get  the  coils to fire in sequence  around the   toroid  we will have it .


gary

gary

hi Gary . actually i still have the unit here , back then i did not use my project board , i committed to the board before finishing and testing it , so i did not make any type of test or tried to improve on it .

I will fish it out , just to ma sure the coil are connected as i remembered .

Mark

Edit i also have a really good idea for a single transistor with 3 jt pairs of coil at 120 degrees , fired by a 1v motor switcher , so you switch on one pair at the time first freq , but the jt transistor has its own freq  so the second freq is there , plus you get a bigger kick form the on of for the coil (one the motor) , so you get on kick on off and many kicks form the transistor , then go 120 away repeat then the 120 to complete the 360 , lets say the motor runs a 5000 rpm so 5000 hz , humm .

Now with only one coil on at a time the other two can be use to fill a caps on there of times .

I will draw it ...


Mark

[resonanceman]

Did  you  try  hooking  the  coils  up in other ways ?   such  as Red/Blue   then  yellow /


green?

I am  not  sure that   yellow /red       blue / green  would make  a rotating field


I am  glad to hear that  the feedback from one is enough to drive the other .
My feeling is  that it might be possible  to run it with  just one transitor .......but that may defeat the purpose .   In my opinion  the 2nd JT  would mostly  be  just  flyback  coils .

I  think  the  rotating   field  is the key ..... I think  if  we can  get  the  coils to fire in sequence  around the   toroid  we will have it .

MK

nevermind



I now see that trying to use the 4 coils  one at a time in  series would  be like  running  a 4 cycle  engine .    we would have to  stop  the  pulse  from every other cycle   from triggering   a  transistor .


gary

[Pirate88179]

@ Jeanna:

Yes, I did get the filament bulb to glow, but that was about all it did.  I was using a car tail light bulb (GE 1157) designed for 12 volts.  I was hitting it with about 9 volts and got a little glow.

I believe Gary is correct in what he said.  These need amps to light and I was hitting it with mA's.  I imagine they are just about like resistance heaters (electric ranges, ovens, water heaters, etc) which need amps. 

One thing I never did try was to hit a 12 volt bulb with about 400 volts from the Fuji.  I doubt it would do much of anything.  I might try it for the heck of it anyway.

Bill

[resonanceman]

@ Jeanna:

Yes, I did get the filament bulb to glow, but that was about all it did.  I was using a car tail light bulb (GE 1157) designed for 12 volts.  I was hitting it with about 9 volts and got a little glow.

I believe Gary is correct in what he said.  These need amps to light and I was hitting it with mA's.  I imagine they are just about like resistance heaters (electric ranges, ovens, water heaters, etc) which need amps. 

One thing I never did try was to hit a 12 volt bulb with about 400 volts from the Fuji.  I doubt it would do much of anything.  I might try it for the heck of it anyway.

Bill

Bill

I  tried several  of my  JTs  that  easily  lit a CFL  on a  40W 110V  bulb ......nothing .....not  even  a glow .

gary