Joule Thief

[hazens1]

Yes, let's keep the EB posts in the EB topic and post JT stuff here. Makes sense right? I'm tired of wading through so many posts in this topic that are OFF-TOPIC..

yup.

And after I fixed the loose connection I got better voltage. But lets talk about this on the other thread, OK?
I posted a bunch more pics and 2 movies today and they warrant a bit of talk, I think, but over there where the talk is EB.

jeanna

[altrez]

Thanks, but now, I want to know where the scope is.
You have the rheostat across 2 pickup wires... and where is the scope connected? Right there too?

jeanna

Yes the probe is connected with the hook on the wire.

-Altrez

[jeanna]

Hi everyone,
Well, in spite of the heat, I managed to get started on something I realize is important.
It is important to me, anyway.

You might remember a couple of months ago I removed the second transistor in my 2 tier joule thief and found there was no need for this second transistor. Then I literally dropped a wire and it landed in a hole that made the lights get bright. (pretty strange, but cool.)

I have been thinking about what this is and I have decided it is worth exploring.
It is, I realize after reading some of Tesla's lectures, a circuit like the ones he was proposing in 1892-4.
I will go into that part more later.
It is too hot and the details are too new to me.

So, I put together a 2 tier circuit and as much as possible, I matched the 2 toroids.
They are not an exact match.
It seems I soldered one that matched one of these, but here is what I have for today.

This helps me to set up the table and the picture.
I made a jpeg of the table with drawing.

I forgot to take the amps draw, but conceptually speaking, I remember the amps draw was higher with a second tier operating.
Once before the amps draw changed from 29.5mA to 32mA when the second tier was added to this toroid.

I put the clip and probe of the scope on either side of each led at the place I was testing.
Please bear in mind all these figures include the 5 leds which are in the circuit and brightly shining.

-
Oh and a note on the second row of numbers.
I added an additional 8T pickup to the basic first tier circuit.It took more than a predictable number of turns to turn on a led and I looked at what it did to other wires on the circuit. I don't trust all my numbers so I am only posting the ones I know are right.
There was a lot of flashing of lights until I found a loose led. I rechecked all these numbers.

jeanna

[jeanna]

To help you look at this, start at light "C"

On its positive side it is fed by
one wire which is the end of an inductor which is a single coil - the secondary in green,
and another inductor which is at one end of a center tapped inductor.

On its other end it goes straight into the neg of the battery rail.

Now, follow those inductors.
One of them goes to the other side which feeds another circuit
and the other is the center tap which ends at the pos battery rail.
That other one also happens to continue on and feed into another circuit.

The light "D" which is in the battery rail is connected to the center tap of the just mentioned inductor at the pos side of the rail,
and one side of the pickup coming up from the first tier on the neg side of the rail.
( Remember, this first tier is what is producing the pulses for the whole thing. It has the only transistor.)

enough for now,

jeanna

[jeanna]

Let me try one more time.

There is a basic joule thief:

It has a 2N3904 Transistor
480 ohms resistor
5T,7T,38T toroid
Additional 8T pickup added later.
"A" is  the name of its BJTL
Battery source 1.3v
--
The 38 turn pickup is the source for another joule thief toroid.
7T,8T,38T
no transistor
no resistor
no battery

"C" is in the BJT place by virtue of its being between the collector and line to the neg

"B" is a LED that has one connection to what was the emitter

"D" is in the battery rail

---
"E" is a led in an additional circuit available from this set up.
It is turned on by the 8T pickup that I added later to the first tier toroid.

I hope this make some sense now.

jeanna