Hi
I also wondered that, and when I said it MK1 said he had found the results very disappointing.
Me too.

In the end I realized that the joule thief works from a low voltage dc source mostly because of the transistor along with some other things.
Go ahead and see for yourself.
Maybe you can figure out a way.
That would be cool.

I've tried this as well, it seems as though impedance plays a role in the dispensation of energy...the voltage is only produced after the flow of energy has ceased in the inductor and thus surges for an exit ...  it is not strong enough to make a significant difference by passing through yet another inductor.

I think the exciter and joule thief circuits should be considered 'irritable electricity' ...

- - - - - -

I found a relatively old book by Texas instruments from 1963 which contains 7 pnp based circuits which, as it stands, do exactly what the joule thief does in principle.  I found it for 50 cents at a local thrift shop.

Some interesting circuits here in this book, perhaps I can translate them to a diagram soon.  Some of them contain multiple transistors.

The book is titled "Transistor Circuit Design".

Jeanna,

So you tried this?

                      JT---> D=C ----> JT

That is a Diode and Capacitor capturing JT Pulse... then another JT feeding off of said Capacitor.

The Observer

Jeanna,

So you tried this?

                      JT---> D=C ----> JT

That is a Diode and Capacitor capturing JT Pulse... then another JT feeding off of said Capacitor.

The Observer

No, I didn't.
(But is that not what Kooler's circuit does?)
I cannot figure how to get 70v or more into a safe form to use in the second tier.
Then also, when some of us have tried to make the jtc with a higher input voltage the results are not really different.
The jtc is making pulses, and that is what it is about.
The sharper the pulses, the better.

But you could discover something I have not.

If you read my posts about the 2 tiered circuit, you will see that I discovered that the second transistor was not even operating.
I went off in another direction and never went back to try making the higher voltage input work,.
But, don't let this stop YOU!
Follow your ideas, you may not get the solution you are thinking you will get now, but you will learn a lot and probably get A solution.

So, go for it!

jeanna

About multiple JT's.

I had thought about this a while ago but never tried it.  It just seemed to me that since the basic jt puts out pulsed dc, unless rectified it would not operate the transistor on the second (3rd, 4th, etc) jt, am I right?  Now, I suppose you could have the first jt's pulsed output running to other bifilar wound coils without any additional transistors but I don't think you would get anything extra that you would not have received from just using a larger toroid in the first place.

I believe Gary did this a while ago by linking a number of smaller toroids to run as one jt circuit.  I believe he did this to find a work around as the real big toroids are kind of hard to come by these days.  I don't believe Gary had a transistor on each toroid, only one of them, but he can correct me here.

Anyway, this is why I never tried it although, like we always say, you never know what might be discovered by trying something.

Jeanna mentioned that the second transistor was not running which makes sense as it would need dc not pulsed dc, unless you rectified the output, I don't see how any additional transistors would operate at all.  And, like Crowclaw mentioned, every additional transistor would take power to run which is against what most of us are working toward here.

Just my 2.5 cents worth.

Bill

About A JT's.

  And, like Crowclaw mentioned, every additional A would take power to run which is against what most of us are working toward here.



Bill

Hi, Pirate88179,

Additional transistor  is working on feedback line. He's only transfering  power from 1rst JT to source battery, - dont use it. Source battery use it for self recharge
"E" Q2 is not on "-" battery !!!!!!!!!

@ All, who try to replicate my 2JT.

All my parts are from salvage. What I put on circuit is far away from ideal. Any one, who have electronics knowledge can improve this
I'm little short in  electronics knowledge.   
But with little help my big friend Tektronix465 I can move forward 

@all

Ok i did some test and get more output from my dual circuit with the base from one on the others toroid.

That way the bemf from the collector from one jt feeds the base of the second jt by induction , i can prove it but i believe they sync and work as one.