Joule Thief

[Mk1]

@all

I made pics for you !

The one with the white secondary is how it looked before i added 2 more primary . there is still debate to the best angle . but i used 45 degrees.

There is a equation on the agentgates tread for the diameter vs length , i don't like it , its not symmetric enough for me , i tried it for about 3h to get the right numbers for 36 turns 3 per lap at 45 10 degrees apart , the best i get is 18 .

[xee2]

@ jeanna

Would you please measure the inductance of 9 turns on a 1" diameter (5 for a dollar) Goldmine toroid for me? I want to compute the permeability of the material.

[jeanna]

Ok first off this coil is supposed to be pulsed at around 30 v low amp , square wave , at low freq in the audio range more or less 1khz.
I deal condition should cause direct dc from the secondary , no diodes .

So, this is starting with 30/1.2= 25 times as much energy as a JT.
And what is happening as a result?

If it is supposed to be pulsed, then it can use a jt to pulse it.
It is not hard to make a 1khz jt that can pulse it.
So, once you pulse this with a low amperage jt at 1khz and 30v, what have you seen?

I have seen your pictures of 1 led and 24 leds in parallel (=same thing as 1 led) so that is 2 leds. You are also lighting a bulb brighter than a battery, which you say is a filament bulb.
Is this correct?

You get a steady DC so you can fill a battery from it?
Or light a dc bulb?
or put it into an inverter and use it as ac?

I want to be sure because this conversation has been a little chopped up.

thank you,

jeanna

[Magluvin]

Mk1
Are you using a resistor on the primary? I tried resistors and the output was significantly lower.
I didnt know you brought the coil over here.

Mags

[jeanna]

@ jeanna

Would you please measure the inductance of 9 turns on a 1" diameter (5 for a dollar) Goldmine toroid for me? I want to compute the permeability of the material.

sure...

0.74mH =  9 turns.
jeanna