Joule Thief

[jadaro2600]

The blue thing in the previous images is a capacitor - the circuit is setup in the optional configuration as shown in the circuit diagram.  Here is another picture without it.

I have a 10k variable resistor; I'll stick in it and see how it works.  ..*edit; as it so happens, I almost fried the transistor.  This thing is very sensitive, it seems it won't take resistance over 2.5k or so.  at 0 resistance, it nearly fries the transistor, ..but nothing happens at 10k.

I put a 1k resistor and the 10k varistor in series to test this.  that's not what is pictured below, however.

This toroid is poorly wound - I'll probably wind one of the others later - with a bit more neatness.

[Mk1]

@jadaro

Nice ! Now how many led do you have? Connect all of them .

They will light.

[TheNOP]

Even if only 47 mili at 100 volts thats still is more then 1.2 v at 22 mili . Over ?

i can't get my mind to simply accept those numbers, it can't be that simple.
can it really go over the current passing through the torroide 
i must see this by myself.

i made a few mk2, it will be easy to add more coils to them.
different size, with ramma garden wire for the torroid.
the start and ending are welded together with a semi automatic welder.

1 x 2 inchs X 2 layers
1 x 2 inchs X 3 layers
1 x 2 inchs X 4 layers

the 2 inchs measurement is the coils internal diameter.

2 X ~10 turns for the jt, .22 gauge with 4 pickup coils, .30 gauge
10 k pot for tuning

i don't have any 3904 or 2222 to test with.
no electronic store near my home and i don't have a credit card to order some.

fortunatly, i have found 2 transistor i can use.
c2120
B714   <-- work great but need 3 volts

i can't see any real difference from torroids found in computer power supply and the torroids i have made.
well, there are differences, but after tuning the jt coils, all torroids give me almost the same output.

for an unknow reason i do seem to get a bit more output with the even layered torroids.

[jadaro2600]

Has anyone tried activating the transistor with a different power supply.  As in, have one battery powering the coil-to-base and another going through the transistor in a separate circuit?

I know we've got a few people using 555 timers.  But what about separate power supplies all together?

[jeanna]

hmmm ramma garden wire is the next new thing in electronic circuits!

Maybe the us has some kind of garden wire. Is this paper coated steel?

OK down to specs.

NOP Please explain. You made steel (or iron, or aluminum) toroids (YEAY) and you said they are 2 inches I guess diameter. and some layers. I guess this is 2,3,4 layers thick, but how many turns are on each layer, please.

You welded the ends so it is a loop - right?

I am soo glad to hear this. I may go to the garden center in town to find some garden wire.

again...
Is is paper coated?

thank you,

jeanna