Joule Thief

[Groundloop]

@electricme,

>>Is it possible to use a number of Jule Thieves to get a higher output by ganging their outputs.

I do not think you can connect one Joule Thief to the output of the first and get more power.
If you want to make one unit that can drive more LEDs from your earth battery then you
probably need a third winding on your coil. Then the output is insulated from the input.
You did not say how much power you got from the earth battery but if it is around one watt
or so then you can light up many ultra bright white leds with a JT.

Good luck with your research.

@All,

I hand made a new JT coil today. It has 20 turns primary, 20 turns trigger and 2000 turns output coil.
The core is a ferrite rod 40 mm long and 8 mm diameter. My design goal is to switch approx. 12 watt
of power to a fluorescent tube. At 12 volt 1 ampere input the output should be 1000 volt at 10mA.
(Not counting losses in the circuit.) I found the ferrite core in an old PC power supply. The wire is
from a standard small transformer. The coil is held together with hot glue and tape. I taped the secondary
at regular intervals to get some insulation between the layers in the core. I hope this will prevent sparks
form flying inside the output core. I will wire up the circuit this weekend and tell you how it went.

(Edit 12.12.08) I tested the coil today. At higher voltages the coil shorted out on the secondary.

Groundloop.

[Freezer]

@All,

I hand made a new JT coil today. It has 20 turns primary, 20 turns trigger and 2000 turns output coil.
The core is a ferrite rod 40 mm long and 4 mm diameter. My design goal is to switch approx. 12 watt
of power to a fluorescent tube. At 12 volt 1 ampere input the output should be 1000 volt at 10mA.
(Not counting losses in the circuit.) I found the ferrite core in an old PC power supply. The wire is
from a standard small transformer. The coil is held together with hot glue and tape. I taped the secondary
at regular intervals to get some insulation between the layers in the core. I hope this will prevent sparks
form flying inside the output core. I will wire up the circuit this weekend and tell you how it went.

Groundloop.

Looks great.. Sounds very similar to the Stubblefield coil..Do you have any idea how Stubblefields battery worked?  After studying his cell, I believe he was gearing it for high voltage, and not concentrating on getting amperage.  Mr. Thrapp stated in his radio interview that, "you can make amperage".  Have any idea what that means?  I have no idea..His cell seems to be like an ignition coil.

[innovation_station]

ist ....   calling       sparks..... 

amparage is made      hummmmm

hi volts low amps   .......    low volts high amps  ........    hummmm

left hand                               right hand                        hummmm

ist!

[Freezer]

I picked up a fuji for $4.  Makes a great joule thief... I used jose pino's circuit, and it works great.  It lights a 15w fluorescent bulb, but wouldn't light a 35w.

[electricme]

@ innovation_station
Thanks for your kind welcome

On AMPS, the best way to explain this simply is to imagine you have two dry cell batteries, a AAA and a D cell
If you take them both apart, the center carbon electrode in the AAA is way smaller then the D size carbon electrode.
Because the surface area is so much smaller in the AAA battery, it will only be able to put out smaller amps (read that tiny Amp)

AMPs is the amount of "current" or energy that has the push or muscle behind it.
However, the Voltage will remain the same in either battery, ie 1.5 volts

Hope this helped you.

@ groundloop
What I looking to do is run 2 JT of 2 seperate feeds, but both feeds share a common earth (-).

Then use the hi freq outputs at the LEDs to drive another seperate torid (no2), which feeds into the primary having a centre tap.
Then make a secondary on the (no2 torid), wind on a lot of turns (dont know how many (just lots)), then feed this into a very small 240v to 12v ac transformer, (out of a plugpak) and rectify the output, and see if this will give me any useful power.

Its just a thought mind you, and probably won't work, but this is a job for afta this weekend.

If this works, then I will make up something like 3 phase input, we will see, just trying a way to get more grunt.

Gona get my frequency meter this week or next week, if it's still there 

jim