Joule Thief

[Groundloop]

Hi,

Here is a little LED driver that I have tested.

It can be run from a 1,5 volt battery. Maximum
input 9 volt, but the Q1 transistor will be warm.

Bigger coil and power NPN on heatsink (Q1)
for higher input voltages and higher loads.

GL.

[Pirate88179]

Groundloop:

Very nice, well done.

Bill

[ALVARO_CS]

May it be useful when one has a poor access to big sized cores, or cores with special shapes.
I made a cube in cardboard (2mm) ext. dimensions 3,3x3,3x3,3 cm, and wired it bifilar 11 turns in the three directions (total 33 turns). Aluminum wire from an old transformer 0,8 mm.
Epoxied the interior, and filled with ferrofluid.
Used successfully in a JT (thanks @ Gadget)
It gives induction in all directions, so I`m planning to insert it in a bigger cube, immerse it in ferrofl. Wire another coil over it, and see if  it can amplify the same way as Tesla transformer is supposed to. (related too with the Gabriel device.)
As always, I have a great difficulties in having reliable measurements. (no scope) and I´ve become an expert in salvaging all kinds of discarded electronics he he 

Cheers

[Groundloop]

Hi,

This is a LED lamp driver that I'm researching now.
The documentation can be found here: http://home.no/ufoufoufoufo/FMR.rar

Groundloop.

[Groundloop]

Hi,

This is the RF frequency scan from the coils.
The green graph is background RF and the
red graph is from the coils. As you can see
the RF radiation is very small. At 1 meter
away from the coil the RF is very low.
There is no audio noise from the coils.

I get almost full light output from the 1,8 Watt
led bulb at a input of 2,7 Volt @ 0,69 Amp.
(1,863 Watt). So there is little loss in this circuit.

If you want to run this circuit from 12 Volt then
add a 470 Ohm 5 Watt resistor in series with
the transistor base pin.

The transistor shown in the circuit drawing will
not survive higher voltages than 12 Volt. The
inductive spikes generated is so high that the
transistor will self destruct at higher voltages.

I tested a base resistor (variable 5K) and the
transistor did blow at 29 Volt input. Just want to let
you know.

I need to find a power NPN with a voltage
rating of approx. 1000 Volt.

GL.