JT first attempt

[lygeas]

@TK
Thank you for your replies and the circuit you posted. I have to admit that it is a bit complicated for me at this point of time-but I keep it in mind because its very interesting.

Trying to understand the joule ringer, I ve made another circuit that when using a capacitor I measure almost 20v and-when I measure it as open (from led to negative see attached photos) I have only 12v. I believe that the appropriate way is using the capacitor and not the second one.

I wanted with this circuit to create a high voltage JT. I will try it with a bigger torroid to see what measures I will have.

I hope to be able in near future to light a cfl lamp (instead of the led now) with a similar type of circuit.

[d3x0r]

High voltage Joule thief...


This is best done adding another winding of a lot of turns... if you try and do it with the drive you'll exceed the voltage of the driving transistor.

[lygeas]

High voltage Joule thief...


This is best done adding another winding of a lot of turns... if you try and do it with the drive you'll exceed the voltage of the driving transistor.

Dear d3x0r 
Do you  mean to add another winding to the secondary coil?  if i use a 2n3055 transistor will I be ok?

Thank you

I dont understand what happened with the photos that i tried to upload.I will retry.

[d3x0r]

Dear d3x0r 
Do you  mean to add another winding to the secondary coil?  if i use a 2n3055 transistor will I be ok?

Thank you

I dont understand what happened with the photos that i tried to upload.I will retry.

I don't understand what's happening in the phtotos either


so on a joule theif normal, you have 2 common windings to power, 1 to the base and one to the collector/source. 
to get high voltage, add another winding of a lot more turns than either prior winding.

[lygeas]

I don't understand what's happening in the phtotos either


so on a joule theif normal, you have 2 common windings to power, 1 to the base and one to the collector/source. 
to get high voltage, add another winding of a lot more turns than either prior winding.

Ok you have a point. \
I am uploading a schematic in order to clear this out. Please see attached photos.

I measure the output by substituting the led with a radial electrolitic capacitor 10mf 25v. This gives me almost 20v.
The 12v are when i measure from the led direct to the negative