Joule Thief

[teslaalset]

@all,

I have uploaded a new video on youtube showing my new circuit.
The COP calculation i made using the measurements that i took in the video came out to be 1.42 at that time. Normally this would be well over 1.5 but 1.42 isn't bad also i think.

Maybe you guys have some ideas or comments for me.
The link to the video is: http://www.youtube.com/watch?v=S4vG_vGIhmo

Regards,

Flux 4 Energizer

Hi Flux,

Did you only measure current?
COP is about power out/in ....

[Flux4Energizer]

Hi Flux,

Did you only measure current?
COP is about power out/in ....

@teslaalset

Yes in the video i only measure current, but on the list you can see the applying voltages which go with that current. So in fact i measured amperage as well as voltage, but even if i didn't measure the voltage you can see the efficientie because of the loading batteries!!!

@all

Yesterday i made another coil / core (i didn't count the turns on the used core) but it didn't give me a good result. So i think the size of the core and the number of turns is very important!?! I didn't count the turns because i was just fiddeling around and stumbled on this effect with the coil used in the video. I will give it another try tonight, i'll try to make yet another coil / core and test it in the used circuit.

Regards,

Flux

[Flux4Energizer]

@All

Yesterday (this night actually) i made a few coils / cores and this time counted all turns. I finally got a core / coil config which gave me the wanted result!!! It's not as good as the initial core / coil setup but i'm happy with it. I almost was afraid i couldn't replicate the setup at all and began to think it was the core or just plain old luck. But like i said i did manage to replicate a core / coil config. COP isn't that good tho i did a very rough and quick measurement and came at > 1.15.

Well after my vacation i'll draw the circuit and give the core / coil specs.

Regards,

Flux

[shylo]

Hi all been doing lots of reading about the JT circut....JT 101 mostly trying to digest all the info .....built my 1st .....it didn't work at all...I used a transistor out of an old stereo, as well as the resistor .....my ferrite core is a ring magnet from a speaker..........because core should have high permability........how much higher can you get.....just curious as to what is the best design to date .....an update page every once in a while on the best construct would be a definate asset......no sense in re-inventing the wheel .....I'm on dial-up so it takes forever to load a single page ,worst when their's pics...Q where can I salvage a decent ferrite core?...thanx for any help ....shylo

[kooler]

Hi all been doing lots of reading about the JT circut....JT 101 mostly trying to digest all the info .....built my 1st .....it didn't work at all...I used a transistor out of an old stereo, as well as the resistor .....my ferrite core is a ring magnet from a speaker..........because core should have high permability........how much higher can you get.....just curious as to what is the best design to date .....an update page every once in a while on the best construct would be a definate asset......no sense in re-inventing the wheel .....I'm on dial-up so it takes forever to load a single page ,worst when their's pics...Q where can I salvage a decent ferrite core?...thanx for any help ....shylo

the best ferrite core i ever got were from a car audio amp.. then the next best is from a computer power supply the small toroids that have the white plastic covers..
the speaker magnets don't work good at all.. magnets and steel cores need alot of windings to work..

the small toroids you find in the small cfl bulbs like 9 watt have weird colors like orange and green are good also but very small..

robbie