Joule Thief

[jeanna]

@ jeanna

What size toroid are you using? From your results I would guess you need at least 20 turns for collector coil. To light a CFL you are going to want the collector coil to produce at least 40 volts. The pickup coil should then be 10 times more turns than collector coil to get 400 volts on the pickup coil.

This is about 3/4 inch outer diam like the 'filter', but the inner diam is a little bigger than the "filter". The filter does really well as a joule thief with 3T,4T as I have been describing this lately. This is the one I tried to match to get some comparison with these new high flux guys.

The frequency is incredibly high 1.4MHz. I have room to raise the voltage and still have a high frequency-- if I have room for the turns.

Now, are you making multiple layer on your pickups?

Does the effect of adding more turns diminish with more layers?

jeanna

[jeanna]

@jeanna

http://www.2622736.com/ch229.htm

i have found on this page the specs some have a 26 on perm.


Edit...
nice things to know !

Mark

Yes, well I don't get the overview from any of the information on the internet regarding flux and perm. I see a lot of math details, but the details don't tell me much. I need a broad overview so I can make my way through it.

cws has a lot of information about these toroids in the form of scanned manuals as pdfs. I have some of those pages here.

In fact these toroids from the link are the very ones I have. I have the 2 that are 60 and 125 permeability.
CH229060, CH229125
And then I got some others. In the pic these are the eyes. they are small.

thanks

jeanna

[Pirate88179]

A little off-topic but, I just ordered 20 of the 1" glowing tiles.  I got to thinking......(dangerous) if these are really as bright as reported (I got the aqua blue) and last as long as reported, one could make a 1 foot x 1 foot square for about $72.00.  (144 x $.50)  if this made a lot of light, can you imagine an entire wall of these in a room that gets daylight  (direct sunlight) during the day and what that room would look like at night?

My beer keg is almost empty.  (Buuuuuurrrpp!) Soon, I will have to get the schematic from Wilby and try to replicate the ccfl keg light.

Bill

[xee2]

@ jeanna

Now, are you making multiple layer on your pickups?

Does the effect of adding more turns diminish with more layers?

Yes, I use multi layer coils. Added layers are about the same as original. I thought maybe you were working on your large toroid. I find it hard to get a lot of turns on small toroids.

Increasing permeability increases inductance per turn. Thus it takes fewer turns with high permeability to equal the number of turns in a low permeability coil. In general it is best to have high permeability but also in general the higher the permeability is the lower the frequency must be. Also in general the losses in the coil are higher as permeability increases.

[nievesoliveras]

Ah thank you, jesus,
I will do this almost exactly first. Then I will switch and make a charger from the secondary until I get one to work.
I only have 2 types of diodes for use. they are
4001 - (I made a full bridge out of these.)
and
4007 -(just got them)

I remember you said once before any in the 4000 range will work. I hope that applies to this as well.

I am glad you posted today. I was wondering how you are? You are here. So, good.

L jeanna

The diodes 4000 series spend more energy than the 4148 kind. It will be good to know your results.

Jesus

What kind of batterys are they?

I have had good luck reconditioning  a sealed  lead acid battery from  a UPS
It has sat  for  at least 3 years  ......its voltage was down to 4 V 
I  trickel  charged it  with just a cap  (1uF ) and bridge 
It  took a couple of weeks  but  it  seems to be like new again .

I am  currently trying  a Ni Cad  for my  drilll      It  doesn't seem to be helping it  any .

gary   

My batteries are AA 1.5v Alkaline. Non rechargeable.

Jesus