Author Topic: Joule Thief (Read 6372310 times)

jeanna · « **Reply #10050 on:** November 22, 2009, 01:28:26 AM »

Gadget,

Would you please help me with the thermostat thing?

I see it is a switch.
Is it a standard switch I can buy at the hardware store?
I think it is unusual voltage, and I bet it has more than 2 wires in it??

thank you,
I am so glad you saw this!!!!!

We can have that cuppa tea soon.

jeanna

edit
Great Paul!

I am so glad it has helped.

poynt99 · « **Reply #10051 on:** November 22, 2009, 01:30:40 AM »

jeanna and gadget,

If you moved the operating frequency of this device way up there in the MHz, it might be possible to have it work without any core at all. However, in this case all 3 windings would have to be wound tri-filar.

If we go back a step and think only of the basic JT circuit, there are now only two wires that need to be wound bifilar. The circuit relies on the coupling between the two windings, and in that sense they are simply two closely-coupled but separate inductors. One is for generating inductive kickback, and the other is a pickup coil that triggers the transistor.

So, it's only terminology and I don't expect you to understand or even care, but technically speaking, the connection between the two coupled inductors is not a center tap.

.99

gadgetmall · « **Reply #10052 on:** November 22, 2009, 01:38:57 AM »

Quote from: Pirate88179 on November 22, 2009, 01:24:56 AM

Gadgetmall:

All drawings updated as you requested.

Bill

Thank you Bill . man o man

@paul . so you have never actually made a jt huh? your a newbe

just pokin fun and trying to break the ICE . . regardless of how to wind it its cenertapped to positive of the primary battery . thanks for you interest .

L8r supper time

gadget

PaulLowrance · « **Reply #10053 on:** November 22, 2009, 01:52:30 AM »

Quote from: poynt99 on November 22, 2009, 01:30:40 AM

So, it's only terminology and I don't expect you to understand or even care, but technically speaking, the connection between the two coupled inductors is not a center tap.

poynt99,
When some of the poster here say "center tapped," they might be referring to their own lingo. Who knows. I have gadgets circuit running nicely in spice. So at least I know it oscillates.

Gadget,
I don't see the big deal with people trying to get the details. You people are using unconventional descriptions. Maybe more people would replicate it if the drawing was clearer. Anyhow, I gather that my last drawing was correct?

Paul

innovation_station · « **Reply #10054 on:** November 22, 2009, 01:55:40 AM »

thank you everyone

nice to see you agin 99

j your so patient! my my

sorry gadget and everyone .. didnt mean too ..

lol

but its ok ! we gonna pick up the pace really soon

w

jeanna · « **Reply #10055 on:** November 22, 2009, 01:58:11 AM »

Paul,
Your last drawing was correct.

Gadget is a radio guy.
They have an understanding of turning wires that most people do not.

I am glad spice has a joule thief, now how about it?
Make a real one.
Then you can smile because you have a bright light that is almost free.
When you add many many lights in series to the secondary as many of us have, you will smile broader because you will have MANY lights for almost free.

However you do this, I hope you
Enjoy your day.

jeanna

PaulLowrance · « **Reply #10056 on:** November 22, 2009, 01:59:07 AM »

In all fairness to the guy selling the bcaps on ebay, this should be posted in all fairness. He wrote back saying,

"Dear paullowrance,

If that was Albert ----- he has been purchasing dozens of these and reselling them. No problems so far see my feedback. If too much voltage was applied they can be damaged. See Maxwell website for more info on the use of these.- cusdn"

Paul

Pirate88179 · « **Reply #10057 on:** November 22, 2009, 02:00:06 AM »

Quote from: PaulLowrance on November 22, 2009, 01:52:30 AM

poynt99,
When some of the poster here say "center tapped," they might be referring to their own lingo. Who knows. I have gadgets circuit running nicely in spice. So at least I know it oscillates.

Gadget,
I don't see the big deal with people trying to get the details. You people are using unconventional descriptions. Maybe more people would replicate it if the drawing was clearer. Anyhow, I gather that my last drawing was correct?

Paul

Paul:

People have been giving and getting the details here for over 10,000 posts but, since you are not motivated enough to read back more than 5 pages, you don't get it. WE all understand this terminology because it was all agreed upon back, you guessed it, in the previous pages.

Look at it this way...when the transistor was invented back at Bell Labs, and they decided to call it a transistor after all of their research efforts, someone later comes in and says "That's not a transistor...what is a transistor anyway?" it might not be received too well. Especially if all of the research leading up to that point was published and readily available to all who choose to read it.

Bill

PaulLowrance · « **Reply #10058 on:** November 22, 2009, 02:05:27 AM »

Okay I appreciate it Bill. So how many pages back in this thread should a person read? All 1000+ of them?

Paul

Mk1 · « **Reply #10059 on:** November 22, 2009, 02:11:00 AM »

@Paul

I believe the first 150 pages or so , should be enough to get you up to speed.

After that is more elaborated version , and confirmation of concepts from the beginning pages .

Mark

jeanna · « **Reply #10060 on:** November 22, 2009, 02:12:06 AM »

Paul,
I have suggested this before, but maybe you didn't hear it.
I assume you are using firefox with adblock turned on, because those ads take a long time to load each page.
Beyond that go to your profile page and find the setting that changes the number of posts per page.
Mine is set to 50 posts per page, and it really helps. It is one page instead of 5.

It is up to you, of course.

jeanna

Pirate88179 · « **Reply #10061 on:** November 22, 2009, 02:39:54 AM »

@ Paul:

I agree with MK1 and Jeanna...the first 150 or so will give you a good solid foundation on our progression here. I believe I made it up to about page 600 in the Joule Thief diagrams topic where I posted the schematics and referenced the page they were posted on in this topic. But, I will say that, since things were progressing so fast, some of those may be outdated now by newer and improved circuits.

I went back the other day and read the first 50 pages over again (I guess I was bored and could not sleep) and I was amazed at how far everyone on here has come in that short time.

Bill

gadgetmall · « **Reply #10062 on:** November 22, 2009, 02:51:01 AM »

Quote from: jeanna on November 22, 2009, 01:28:26 AM

Gadget,

Would you please help me with the thermostat thing?

I see it is a switch.
Is it a standard switch I can buy at the hardware store?
I think it is unusual voltage, and I bet it has more than 2 wires in it??

thank you,
I am so glad you saw this!!!!!

We can have that cuppa tea soon.

jeanna

edit
Great Paul!

I am so glad it has helped.

Jeanna it can be several types of switches . I like the Bi metal contact . it can also be a thremal cutoff . you can find these in almost and device that heats . hairdryers , irons dryers . Its a matter of just moving it closer or further away for these and as far as the bi metal you just bend the metal to meet the heat needs . I hope this helps . There is also the old thermostat that have a tilt mercury switch in them so when a given temperature is reached it tilts the mercury and either breaks or makes the connection . agree THIS IS VERY HIGH AMPERAGE AND
THERMAL CUTOUTs are probable what i will use other wise i just use a switch

@paul thank you for your Interest . If your replicating then fine .I think thought you need to start on page 1 or go to evilmadscientist.com and learn how to make one there before drafting up someone elses work ..

gadget

Pirate88179 · « **Reply #10063 on:** November 22, 2009, 03:02:45 AM »

I will re-post this here:

http://www.instructables.com/id/Make-a-Joule-Thief/

This is what I used to make my first working basic joule thief. Very good, clear instructions. The Evil Mad Scientist labs version was fine except, they were not clear, at least to me, on tying the two end wires together from the bifilar winding.

Bill

nievesoliveras · « **Reply #10064 on:** November 22, 2009, 03:48:24 AM »

@paul

The corrected circuit is here.

Jesus

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