Joule Thief

[jeanna]

@xee2,
I went back a hundred posts and compiled some of your posts.
I still have questions and I am going to try to ask them.

This is a first for me. Filament bulb lit from pickup coil of JT. I am not sure if anyone else has already done this. It doesn't make much sense to do this since the bulb will light directly from the 1.5 volt battery, but it does show it can be done.

I think this is very exciting.
It is another tiny step to producing what substitutes for amps in this secondary made from the pulsing magnetic components of the jt toroid.

permeability of free space = 1.2566371 × 10-6 (μ0)

but I am not sure about the units and they make all of the difference.

See if dividing 10,000 by 1.2 gives your K value for TOR-60

the quotient is this...7957
but tor 60= 4935
So, this leaves me still unsure.

@ jeanna
I think the attached chart shows the effect of different permeability. The W material has a higher permeability than the J material. Z is a measure of inductance per turn. Notice that below 2.5 MHz the high permeability material produces more inductance per turn where as above 2.5 MHz the lower permeability material produces more inductance per turn. The material is selected which gives the most inductance per turn at the frequency of operation. For Joule thiefs, the frequency is in low KHz so the W material is better for JT.

EDIT: The J material will work in JT but it will take more turns than the W material to get the same output voltage.

I wonder, because the jt I am using never goes that fast.
My highest is 208khz
It needs to be able to hold the 'power' then let it snap back very quickly.
The high permeability toroid I bought as such from the goldmine did OK in a test I made yesterday, and it is about the same dims as the tor 60 which I got yesterday. Maybe today will be well used to make 2 that are similar.
I will use the new method I think I discovered last night. I will match the inductance of the primaries then see what the secondaries give me and what frequency,

thank you,

jeanna

edit add...

Thanks crowclaw.
I looked there a little while ago. I was surprised to see it.
But it didn't go very far.
I will add a bookmark.
Many times, I do not know enough to see the answer to an important question. Later, I may be able to use what that site says.
thanks
j

[crowclaw]

@ jeanna,

Hi, here's another site you may find interesting to visit:
http://www.tech-systems-labs.com/freesoftware.htm
Notice some info on torroid's etc.May be of some interest!

regards Merv.

[innovation_station]

j

i have designs posted that ramp up ...

wind up ...  output wave is off my 20mhz scope... pulse it .. when it slows down pulse it agin ..

simple   laps 1" goldmine.... 

ist

[guruji]

@FD

If you stop calling people stupid and lunatics maybe then your post won't get deleted......
stupid this stupid that stupid ist... boehoehoe....

I'm sorry this is my first post. I had to read some 1000 pages 
When I first made a JT I noticed that there was some great potential in it. so I started looking and building. Finally i came here.

Got a JT with a speaker magnet core and can be connected to a USB port.
So I can use a cheap solar phone/ipod charger or just hook it up to my PC. Just now I'm Charging a Big 12V 400A batt. With this JT i can charge all my batts that I got.

Last couple of days I've been fiddling with gadget's circuit. I don't have the big Ultra's. (maybe in some appliances i have, still looking ) But i have a 5V 1F ultra cap and I put a solar panel garden light circuit with it.

The Run batt is a 1.2V 750 mAh and is still running at 1.257V
I started at 1.297V but first i didn't got the solar circuit and needed to tune it. now its resting at  1.255 -1.267


Thanks for all the long nights reading and reading

Made me a new coil. Still thinking how i should run it.

GrtZ and keep on building

Hi Gilobob interesting what you've said that you're charging 12v battery. So just doing a JT with a torroid magnet you said? Just to clarify.
Did you do any circuit with it?
Thanks

[Pirate88179]

@ All:

I am back!

After many phone calls and e-mails from my good friends here on the forum, as well as a few e-mails from our host, Stefan, I have decided to return.

I really appreciate the support that came my way during this difficult time.  Words can not express my feelings about this at this time.  You all are very good folks out there, and I thank you from the bottom of my heart.

I also thank Stefan for stepping in when he was needed and taking action that was very much needed indeed.  I know it is easy for us to forget that Stefan actually has other business ventures to tend to and can't watch over this forum like some think he should...I understand this and I hope you guys do too.

My pm's are now off "ignore all" and I am working on restoring all of my settings which may take a little time.

Wilby's post pretty much sums up what I believe we all have been doing here these many, many pages of posts.  We have had disagreements yes, and good healthy debates but, the regular members never forgot those simple rules that we have learned in kindergarten. Through these debates and information sharing, some wonderful circuits have been built and shared and, most importantly as I see it, improved upon by other members.  This is what we have been doing and I will do everything I can to help it to continue.

So, thank you to all that contacted me and attempted to contact me to share your thoughts about this situation.  It helped me to realize that by leaving, not only was I deserting my friends and fellow experimenters, but I was letting those few individuals win, which ruins it for everyone. Together, we will not let that happen.

Stefan was big enough to admit he had made a mistake, and I am too.  I made a terrible mistake by leaving and it took my good friends to make me see it.  For that mistake, I am sorry.  It will not happen again.

And to all of the new folks coming in to join us, if you have read all or most of the posts here from the beginning (Thank you for doing that and joining us Crowclaw) you will see that the past few days is not the way we usually work around here.  For some reason, and I believe Jim summed it up pretty nicely, some folks can not stand to see folks getting along, having fun, and enjoying themselves and they feel some deep seeded need to disrupt the proceedings.  Well, we have not had to put up with that and, we will NOT put up with that.

So, I beg your forgiveness and say, let's keep up the great experimentation that we have seen here on OUR topic.

Thank you all very much.

Bill