Joule Thief

[Mk1]

Hi,

The setup of stprue give me some idea and have played with my joule thief. i don't know what i have really done but it looks like i have decrease the milliamp of my joule thief.

Without any load on my transistor i read ~50ma(is this normal?), with a led it's only ~1ma more.
I have make a coil with a crystal core and have connected it to the two wires going out of my normal toroide. For the input of the crystal core coil i have make it like a joule thief toroide, one wire from opposite side.

I can put leds in the two directions on the output, they will light but are stronger in one side. Looks like i have AC. The stange thing is that if i put a led in the strongest side, i read less milliamp going out from my battery. More leds i connect less mA i read but it don't get to 0mA. When i reach ~36mA and connect more leds, it get more mA.

It works with a toroide too instead of the crystal core coil but instead of taking a wire from different side for the input, i must take the two wire from the same side.Very strange.

Here is a video: http://www.youtube.com/watch?v=_O9jrp0tHT4

Nice , good work !

Now the question , dose a secondary work on the crystal?

Can you replace the toroid with the crystal ?

Tres bien desole pour l'orthographe , crois tu qu'il soit posible d' utiliser selement le crystal pour faire un jt , aussi l'ajout d'une troisieme bobine (secondaire) sur une toroid nous donne une autre source de courent utilisable ...

Maybe the piezoelectric nature of the rock could manifest it self with plates , two pieces of foil should do.

Mark

[stprue]

Hi,

The setup of stprue give me some idea and have played with my joule thief. i don't know what i have really done but it looks like i have decrease the milliamp of my joule thief.

Without any load on my transistor i read ~50ma(is this normal?), with a led it's only ~1ma more.
I have make a coil with a crystal core and have connected it to the two wires going out of my normal toroide. For the input of the crystal core coil i have make it like a joule thief toroide, one wire from opposite side.

I can put leds in the two directions on the output, they will light but are stronger in one side. Looks like i have AC. The stange thing is that if i put a led in the strongest side, i read less milliamp going out from my battery. More leds i connect less mA i read but it don't get to 0mA. When i reach ~36mA and connect more leds, it get more mA.

It works with a toroide too instead of the crystal core coil but instead of taking a wire from different side for the input, i must take the two wire from the same side.Very strange.

Here is a video: http://www.youtube.com/watch?v=_O9jrp0tHT4

Very interesting and good job 

Do you notice any audibles?

[kamax]

Replacing the toroide with the crystal work only with a cap between + and - from the battery. Don't know why.

I just have found that i don't need the crystal coil to do the same, only one or more led between the 2 output wire from the toroide, + side of the led on the wire going to the transistor collector. With this i get the same mA drop 

I still play with my crystal coil to see if i find something weird

Do you notice any audibles?

Hmmm noting that cover the fan of my PC

[stprue]

Replacing the toroide with the crystal work only with a cap between + and - from the battery. Don't know why.

I just have found that i don't need the crystal coil to do the same, only one or more led between the 2 output wire from the toroide, + side of the led on the wire going to the transistor collector. With this i get the same mA drop 

I still play with my crystal coil to see if i find something weird
Hmmm noting that cover the fan of my PC

So you're not hearing and resonant frequency/oscillations?

[kamax]

So you're not hearing and resonant frequency/oscillations?

I just have tested it in another room with my last setup,only the led without the crystal and hear nothing.