Joule Thief

[mscoffman]

Hi everybody,

...
I had a don smith/tesla idea to use:
4- a wall wart to transform down and smooth out the secondary volts and see if it
would be smooth dc I could use in something. Don smith claims he can do this and
run a heater, so, maybe I can do the same with a jtc??
So, from the thrift store I got a 120v > 9v which seems to make 12v for some
reason.
...

jeanna

Most wall wart supplies are not regulated...(some are, but it should say that
on the label). So they are rated to produce 9Volts at full load, therefore unloaded
and unregulated will produce like 12Vdc from the peak to peak voltage and pull
down to the 9Vdc when loaded. It's not a very good system, but inexpensive.

The transformers are big 60Hz inductors so the 1KV Jt fast pulses don't get
get through it so well. 1KV could be outside the range of the coil wire insulation
so one wouldn't want to design that wall wart supply into a product.

:S:MarkSCoffman

[jeanna]

Thanks Mark,

This is a proof of concept, really.
People have accused don smith of lying, and Don has seemed to reply, "well, just try it."
so, when this idea came through yesterday, I had to "just try it"

I have a question about your statement:
If the insulation of the jtc can handle the 1kv, then why would the insulation in the device not be able to?

thank you,

jeanna

[Pirate88179]

Jeanna:

Good question.  I await the answer.  Possibly it is the frequency that is mucking things up?  The wall warts are, as I know you know, designed for 60 hz or thereabouts.  We all know from our previous experiments that frequency does some weird stuff.

Very nice experiment to do.  You always come up with the most interesting stuff.  Hey, post a video of it and maybe Lidmotor will replicate it and explain it to us?  Mark may be on the right track here.  I just have no idea.

So much to learn, so little time.

Bill

[jeanna]

Hey Bill. It's  good to hear from you!

I am still getting a slow flash.
I have been fiddling with different things and my guess is the best approach will be to have a resistor which is parallel to a cap together in series with one wire of the little bulb.
Probably this is all I will do. I do not see anything even efficient here, just interesting that I was finally able to get a filament to light.
Remember xee2 using one of these bulbs and getting a flash?
He was using koolers double whammy scr circuit, I think.

I am able to get a jtc to light from this secondary after it goes through the wall wart. It is one that has 2 secondaries, one white, one red and a memory cap across the leads.
It is about as bright as when the plant battery puts 3 or 4 mA into it.
Considering this is a jtc that will easily light 3 LoA bulbs of 20 leds each and light them at full brightness, this is a silly even disappointing exercise.

I think I will change the basic jtc from this 'hot rod' to a regular one and see what happens.

thank you,

jeanna

[midknightoysters]

HI I THINK EVERY ONE SHOULD SEE THIS VID
http://www.youtube.com/watch?v=JtSER6rFOxI