Joule Thief

[zhak]

Good afternoon jeanna, Good afternoon xee2, we your friends from Russia. Excuse for bad English! Help to understand with this circuit, more exact data on details. Resistors and capacitors for shop.? Whether it is possible on small Ferrite toroid намаÑ,аÑ,ÑŒ 250 turns in some layers? Thanks

[jeanna]

Good afternoon jeanna, Good afternoon xee2, we your friends from Russia. Excuse for bad English! Help to understand with this circuit, more exact data on details. Resistors and capacitors for shop.? Whether it is possible on small Ferrite toroid намаÑ,аÑ,ÑŒ 250 turns in some layers? Thanks

Hi zhak,
This toroid from the drawing is 86mm in diameter! So, this toroid is very large.
edit: oops he said 2 inches??

It is possible to get good results by using a smaller one.
A small ferrite toroid can give you 172 volts from the secondary, if it is the right permeability and, if you tune it well.
The permeability u  must be very high.

Please describe what you have that you are able to use.
Please describe how many volts you do get.
Do you have an oscilloscope?
You cannot use a digital multimeter to find the volts output, because the results are always incorrect.

igoogle is not able to translate намаÑ,аÑ,ÑŒ. It says namatat, which is a word I have never seen in english!.

I hope this helps,

jeanna

[guruji]

Hi guys today I built a JT with a 7/8" toroid on Xee2 schematic it's about 10T base 80T collector and it's lighting a neon with a 9v battery.
I would like to use this to charge my laptop battery but I'm afraid that I would do harm to my computer. maybe I should monitor output voltage to it first
Anyone tried this or it's to risky?
Thanks

[jeanna]

@ kooler

  WOW! 0.016 mA. Is this your circuit? I think we should call it the "kooler runs forever circuit".

EDIT: I tried to replicate this circuit with 10,000 pF and 1.4M and it was working at 0.03 mA (I do not have a 4,700 pf cap)

Xee2,
Kooler is using a small type transistor.
Did you see my tests from last week?
I made a small attempt to look at the battery use (amps draw) by different circuits and showed to my satisfaction that the TIP31 has a much greater amps draw even when the circuit is totally empty.
Yes, I know the draw goes down when there is something it is driving, but this was to see why I can only get 5 1/4 hours out of a AA no matter what it is lighting, and to say that the transistor makes a big difference in the ampsdraw.

jeanna

[xee2]

@ zhak

Good afternoon jeanna, Good afternoon xee2, we your friends from Russia. Excuse for bad English! Help to understand with this circuit, more exact data on details. Resistors and capacitors for shop.? Whether it is possible on small Ferrite toroid намаÑ,аÑ,ÑŒ 250 turns in some layers? Thanks

Any resistor and capacitor with these values should work. I think this was a 1/4 watt resistor and a 10 volt electrolytic 200 uF capacitor and a mica 220 pf capacitor with #26 wire. Table shows current and voltage for different R values in ohms (read table across horizontally). I have gone up to 400 turns on the 2" toroid (using 2 base turns, 30 collector turns and 400 pickup turns would light a fluorescent tube). The type of 2 inch diameter toroid was not known. I recommend using a larger diameter toroid with high permeability.