Joule Thief

[Goat]

Hi All

Need your help here if you can offer any advice.

Was just pondering about core material use in the jt (or any other ou circuit) and was wondering if anyone has ever considered using the magnets and holder such as pictured here from an old computer hard drive?

Could there be an advantage using these as cores from readily available dead hard drives?  I work in IT but there's tons of these out there

If the unit is viable as a core which way would be the best configuration for the input and output coils? 

Should the primary and secondary be wound around the end posts or the top and bottom plates?

With or without the magnets?

All comments welcome.

Regards,
Paul

[innovation_station]

waste no time im on to the small pulse motor i have the biggggg one at the cnc...   it weighs bout 35lbs b4 machineing and magnets ...

it will be 18 " and it is 2.5" thick...  i already made 2 diffrent bigggg coils to power it i also have 2 gear boxes i hope to power with it

all powered from a few c or d cells ... and some cam flashes... 

i got 10 1 " round neos x 2"  lift of 180 lbs...

my latest pulse coil is quad fillar .....  trifillar primary pulse ....  and 1 trigger all 14 ga primaries and 22 ga trigger i will use 3 3055

maybe a few more pics tommorow ... 

ist!

[Pirate88179]

Hi All

Need your help here if you can offer any advice.

Was just pondering about core material use in the jt (or any other ou circuit) and was wondering if anyone has ever considered using the magnets and holder such as pictured here from an old computer hard drive?

Could there be an advantage using these as cores from readily available dead hard drives?  I work in IT but there's tons of these out there

If the unit is viable as a core which way would be the best configuration for the input and output coils? 

Should the primary and secondary be wound around the end posts or the top and bottom plates?

With or without the magnets?

All comments welcome.

Regards,
Paul

Paul:

Others here know more about this than I do but my opinion is that you can't use a magnet for the core because that would interfere with the magnetic field set up by the bifilar coil when fired by the transistor.  you could test this easily by bringing a magnet next to a ferrite toroid JT while watching the light.  I tried sticking a small magnet into the center of one of my toroid while running and it did not help, it actually hurt performance.  But, see what the others on here have to say.

Bill

[innovation_station]

after all the building yesterday i decided to try and power something with the unit...

i powered a relay switch  just the coil of the relay and....   well   i was surprized ....

it ran quite some time b4 it finally drained the cap....   like 100 clicks of the relay or there bouts

so look at my mot and in 100 pushes it has more than filled that same cap..

hummm

back to work ... 

this stuff aint gonna do its self ...

ist!

[sparks]

   High frequency high voltage compared to dc is like this.   You can carry a book up to the top of a monument.  (not an obelisk please)  Then you have a choice.  You can carry the book back down the stairs  and place it on the target outside the monument or just drop it off when you are at the top.   Which one will effect the mass of the target the most.  Tesla's analogy not mine.