AC from Joule Thief Secondary/pick-up

[jeanna]

Hi everyone,
I guess this takes longer than one hour.
I have made 3 pics of the circuit of bjt with secondary as feed to another circuit which has multiple circuits on it.

Here are 3 drawings of the first 3 tests done with one JT toroid added as inductor.

Please note,
In all of these there are only 2 wires from the inductor used in each test.
also,
Because it was bothering my eyes etc, I added a 33ohm resistor to the basic jtc at the battery. The voltages are therefore very low. It says here that the voltage across the secondary is 38v. That is with the battery resistor. Without it the voltage is 77-83v. (That is too hard on my eyes and I blow too many leds.)

I noticed later, that is, after I took these measurements, that when the frequency stayed the same as in the last 2 pics here, and the voltage went down, the lights got brighter, and the reverse... ie
when the frequency stayed the same but the volts went up, the lights got dim. I didn't notice it on this group and I will doublecheck to make sure tomorrow, but I think this is could be important.


So, here are 3 drawings. There will be 5 more to follow.

thank you,

jeanna

[jeanna]

Hi everybody,

I have finished 2 more drawings describing the tests I made yesterday.

I need to take a break so I will post these 2 even though there is one more that belongs with them.

there will be 2 more after that. I hope to finish today since I want to try more good ideas.

Here, I added another wound toroid to a different pickup off the basic jtc in this test.

The basic toroid is Xtree. It has 2 secondary pickups. Yesterday I used the long one, which is called "S1".
The one I described yesterday is the Berry which lights 18 leds in series across S1.

This one is the Widow but like the Berry I checked it out in parts.

So, with the Berry still in there lighting 18 leds in series, I used "S2" a pickup from Xtree that has only 7 turns.

First pic is using the 13 turns from the widow bifilar wound primary free ends,

Next the 2 secondary pickups that the widow has on it (7T and 40T) each has a different effect.

The frequency is determined by the BJT base resistor, and it stays at 208KHz, but the lights change when different turns numbers are used. hmm. interesting.

So, for now,

here are some pics

jeanna
edit
Here is the third in this part. They are all the widow and belong on one post.

I used the center tap on this one. It is bifilar with 5T and 8T. The frequency stayed at 208KHz because that is being pulsed from the basic joule thief the Xtree.

There was another interesting light change.
The 8T bifilar here turned the light it was connected to pretty bright, and the volts across this pair of wires was 0.8v, but it affected all the other lights in the other part of this circuit. THEY went dim.

I think this will be useful.
I see that with the frequency being made to be the same, something else has to give. So, if the volts go down and the frequency is HELD the same the energy will go into the lights not the frequency and they will get brighter.

interesting thing.

OK I hope it is clear.

jeanna

[Pirate88179]

Jeanna:

You really do nice work with your drawings.  That is awesome.

Bill

[jeanna]

Thanks Bill,
I sure hope it makes it easier to follow. I will be needing help and that won't come if no one can follow me, thanks.

===

Here are the last 2 from yesterday's tests.

First, I removed the widow, but the Berry stayed in its place  on S1 between L1 and L2 lighting 18 leds in series..

In the widow's place, I added a simple inductor to this S2 with only one led.
First I used a wire on a core. A core just like those in the Berry and Xtree.
I connected one end to L3 and the other to the led which is connected to L2.

1.87v I did not write down the frequency for this. I did change the battery resistor just to see, and the frequency was different, so I must assume for now, that the frequency was the same208KHz, or I would have written it down??

Then I removed the straight inductor with a core and replaced it with a full spool of red magwire from RS.
Gary has suggested this a few times. I had to see.
So in the same spot, it has

0.681v at 208KHz.

Just so you all remember I stuffed the voltage with a 33 ohm resistor.
Just to have a look, at the end of the day, I put it back to normal battery power and this
0.681v turned into
3.25v at 105KHz

Many of these toroid inductors are possibly step down transformers. I just made some tests to begin.
There is a lot more to look at here.

I hope someone else wants to do some of this.

Please , if I have made some things unclear, please ask me for clarification.

Thank you,

jeanna

[jeanna]

Hi All,
While I was doing those tests I reported yesterday, once or twice I had a wire in my hand and the lights brightened. Since the wire I was holding was on its way into a hole in the breadboard, I shrugged it off as... another example of something I don't understand and does not count. ... some kind of capacitive coupling etc...

So, the thing I realized about this is that this may just be the key.

I should remember when this happens and record which wire and how much better etc.

I was obviously being the ground wire in the famous and misunderstood deal that ac doesn't need to return to the battery but only needs a ground.

Maybe as xee2 did yesterday the neg side of the battery will perhaps recharge the battery. (or, that could take more from the battery and needs to be tested.)

Morning thoughts. A little rambly, but the important part is... always remember to notice when the lights brighten!! 

jeanna