Joule Thief

[jeanna]

I don't recall how much voltage it takes to run it but probably more than the 3904 or the 2222. 

Bill

The part you will thorouighly understand once you have done it is there is no extra voltage passing through the 2222 or 3904 when you run the jtc off the secondary.

I didn't realize til today that you haven't done this.

Take one toroid you have already made and wrap a piece of green RS mag wire through it a dozen times. Sand the ends and watch those LEDs light up. And watch how they don't take any extra amps draw from the battery to do this also.

try it, Bill. You'll like it.

I am about to drop another table on youseguys. I am getting better at table making... I think.

jeanna

[xee2]

@ Artic_Knight

I am still trying to understand what the base cap is doing. I do not want to make things more complicated by adding another variable. I do best working on one problem at a time.

[electricme]

OK here are the circuits I have drawn up.

0686 = This is my current JT showing the 2n3904 (TR1) which is pulsing the coil.
There are 2 transistors, in this configuration.
Transistor (TR2) is connected by it's base leg to the first transistors Emitter output leg.

Photo 0687 shows a different view of it.
Photo 0688 is the current circuit.

I have 2.4v DC (+) from the batteries entering TR2 at the Collector, my scope shows identical pulses from the first transistor entering the base of the second transistor. The Emitter of the second transistor (with the white wire) shows pulses coming out on the scope.

I have soldered a white wire, is soldered to the (B) base of transistor 3 which is the 2N3055.

But I think there is not enough power to the TR3's base to turn this device on properly.
I might have to change TR2 to a BD139 or a BD681 so there will be enough current to turn "on" the 2N3055 transistor


jim   

[jeanna]

Here is one more quarter toward the finish of the information on this latest JT 3T,4T,84T
I unwound the scrap of filter wire it came with and which I have used for other tests. Then I wound the other half of the MK1. Now, I have been refining this one for a while. I tuned it when MK1 first described the split primary. I cannot do the split on this because there is some epoxy I cannot remove and I am using that spot for a blank and wrapped the toroid with the epoxy in the dead spot. I still have not tested the dead spot thing myself. I should see where it is.

Here is a screenshot of the table.
This is like the others plus more.

I measured the frequency and volts and ampsdraw as before and also I put a LED in 2 places and measured some more.
I measured the frequency and volts and amps draw with the led in the BJTL spot.
Edit. I measured the volts and frequency across the secondary leads only. (-thanks for asking, xee2.)

The numbers for this are in the table, but I must say that the light was only good on some of it.
On the bottom 3 rows with the 2200 ohm resistor the light didn't go out, but it went out.- if you know what that means. the tiniest speck ever seen.

But no surprise, I put the LED off the secondary and it was bright and beautiful for any cap value.
Now I think of it, these leds are pretty good.
I didn't blow any of them, and perhaps I should have. wow!

OK here goes.

Oh, I will reverse the 3T and 4T in the B and C tomorrow and repeat these same measurements. (the last quarter.)

jeanna
EDIT:
I fixed the mistake in the headings
I did not take measurements of frequency and volts when the secondary was lighting the led. I only took mA there.
I took the frequency and volts with the lights in the BJTL spot only.
I will change this and repost it. I want to catch as many as possible before you download this.
and again for easier understanding.
sorry. I will repost it.

[jeanna]

@Jim,
It is an interesting thing you are trying to do.
I did the 2 tier circuit where the output from the secondary was the feed to another whole JTC, and learned that the second transistor was completely unused by the circuit. I took it out and the circuit worked on the pulses provided by the single transistor. 

It was weak, however, until I connected the wires in a mobius or infinite loop utilizing 3 out of the 4 available coils all being run by the first coil. Then the circuit was strong.

This is not what you are doing.

If what you are doing appears weak, remember to try something else. Do not stop right away.

What you are doing looks a bit more like the idea MK1 posted a few days ago. Not the same thing, but on the same lines as his.

Well, I say, go for it.

the most you can lose is a bit of solder. Right?

jeanna