Joule Thief

[resonanceman]

@Gary

There is a list of to thing that could go wrong , first the led is not connected the right way , second npn and pnp transistor don't work the same quick test revese the battery connect plus on the minus side check the bout ways . If still nothing one of the coil is wrong so exchange the ends of the coils .Check led bout ways.

Lets get that fixed !

Then to serious business .

Mark

Mark

thanks .....checked  all those things

The transistor  is a 3904  I bought a dozen or  so of them   just for JTs
I also  have some 2222s  and  some  2n7000s   ( small signal MOSFETS ) that  I hope to  get working later .


Itr  has to be some  simple  dumb mistake

I got my  first JT running in  just  a few minutes ........but  sense then I have been unable to get another one  going .       

I will  get it ........eventfully



gary

[Mk1]

@gary

2n2222 and 2n3904 , are pretty much be all you need , since we will not be using the original jt coil to pick up the extra juice, but additional coil. A better transistor will most likely consume more energy , some like to run with higher voltages , i don't care . That is just me there , if a 1.5 battery runs of a week , like the led jt that is enough for me now.

Also the transistor can work both way has long as you keep the base. i some time tune the core with the transistor reversed .

Mark

You said you have one working , so make a additional coil around the one working and put a led on it.

[gyulasun]

Have you a link to some place which sells both ferrite cores and magnet wire?

try these for ferrite toroids:

http://www.goldmine-elec-products.com/products.asp?dept=1050

http://www.oselectronics.com/ose_p88.htm

http://www.surplussales.com/Inductors/FerToro/FerToro-3.html

rgds,  Gyula

[hazens1]

@all

Btw what i have is to big for me , lol i need your help .

What kind of help do you need?

[Mk1]

What kind of help do you need?

One man knowing , is vulnerable , many many people ,that is a different thing, I need many replication , many understanding .