Joule Thief

[xee2]

@ Pirate88179

Jeanna:

Here is the link:  http://www.mag-inc.com/home

I believe the part number is: 48613TC  (I believe XEE2 posted this number)

They do not show any pricing, you have to ask for a quote so I think this means they want to know how many thousand you need.  So, I asked for a quote on 4 and I also filled out a free sample request for 4.  We will see what happens.
I also think XEE2 said this was the "W" material.

Bill

Part number for the 3.38" diameter toroid is: OW48613TC which is their W material. You should ask who your local distributor is and buy from them. They sell smaller quantities.

[xee2]

@ jeanna

I came across this today in a search for the K thing.
http://info.ee.surrey.ac.uk/Workshop/advice/coils/mu/#sat

Good find. I think that the permeability number of 10,000 for the W material must be the relative permeability, even though that is not what they say. That is the only thing that makes sense. Thus the K value for the calculator would be 10,000 for the W material. Do not forget that they have a 30% tolerance which is a big range.

[gravityblock]

I came across this today in a search for the K thing.
http://info.ee.surrey.ac.uk/Workshop/advice/coils/mu/#sat

Did you read post #10392 about "k"?  Apparently not.  It has nothing to do with flux density or saturation.  It has to do with how the flux is distributed in a ferromagnetic material due to spatial frequency, unless "k" and "K" are different.

GB

[jeanna]

@Bill
They discontinued that toroid which is why allelectronics had them. They buy overstocks and discontinued. It is the reason I sometimes buy a couple extras on a next order when I like something.
I have bought the little tor-23 by the 20 pack a couple of times.

It is the reason for my searchresearch this weekend. I want people to be able to get a great toroid that will light up those cfls and be able to have a reliable source. But not for $25 which is a quote I have seen.  More like $4.
When we know what we want we could perhaps influence some small company to get them if we promise to send people their way.
I have an email out to one of magnetics' distributors. It is too bad allelectronics didn't get the idea. Maybe they would stock it since they are being deluged now since lidmotor put their name on his video.
We will fins a way.

@xee2,
4900 is way more than 30% below 10k but it could be a reason to sell the stock to a jobber like allelectronics.

I do not believe it needs to be 3 inches to work.
I bet 2 inches OD with large enough core diameter will be fine.

jeanna

[electricme]

@Bill,

I just crawled outta bed, sunk a few cuppa T's and feel a bit better afta being up until the wee hours of the night

Got your PMs Bill, and it's really good to see you back again at the helm and flying the green starry flag, with it's authority.

I see Stefan stepped in, right in the nick of time, great work Stefan and I for one are looking forward to seeing the new features and I an sure the others are likewise.

One thing grabbed my attention through all the previous drama, someone posted they were able to make a torch globe light up, was it's source of energy a Joule Thief? now it takes Volts and amps to make a filament glow, nice going there.

@gilobob, and Croclaw,
Nice to have you along with us,

(now I had better get my big iron ring and turn it into a joule thief).

@ Gadget,
I made some pretty big boo boos myself, you ain't the first, nor will you be the last, it takes a big man to say sorry, and you are still in my top draw of friends, as is everyone on this forum.

---------------------------------------
I just dreamed up the circuit below, maybe someone might like to try it out.
Last Saturday morning I was dredging around the local Dalby scrap mans site and came across a BWD511 10meg cro sitting on the pile of thrown away computer shells, its missing a power lead. I got it for $5 well, if it won't work, some of the parts will come in handy to keep my original BWD 511 cro happy.
I also found 3 old valve radios, most missing valves, but I wanted them for the tuners, tishatang says we need them to "tune" to the earths currents.

hoo roo all

jim

1803 = JT output circuit, use to collect the high spikes
1804 = newest addition to the instrument bench, (don't even know if it works)
1800 = rusty old valve radio chassis (with the goodies)

I  just run outta milk, trip to Dalby coming up in a few minutes lol