Joule Thief

[stprue]

@stprue

I got this picture , try this one , but basically the problem is that you cross over 2 rows of wire , it dose look nice , but you cant put as much wire on the toroid.

Ok I found another way to get this look.  So I can wind this coil to match everything you have altered in the pic! hea...

Now the underside that you can't see in the pic has a small cross as well but you can't see it unless you flip it over.  I will try to take some pic's later tonight but does the sound right?

[nievesoliveras]

@stprue

Did you know that you can practice winding the toroid using a piece of string?
You can use the piece of string as many times as you need to catch the winding mode you want to learn.

Jesus

[stprue]

@stprue

Did you know that you can practice winding the toroid using a piece of string?
You can use the piece of string as many times as you need to catch the winding mode you want to learn.

Jesus

Yes I did know that but thank you anyway.  I sometimes use string but most of the time use scrap or old used wire.  Sometimes it's easier to see wire in a pic then string and it also generally has more depth.

[jeanna]

@ jeanna
I did not have a 30K resistor so I put a 50K resistor in series with the neon so that we have closer to the same thing.

Great!

..

I think you said the MK1 would not light neon with a 500 ohm base resistor. ...

No,

what I said was that the big toroid wound with 2T,10T will not turn on the transistor at 500 ohm base resistor.

You first presented the circuit we have been using with a 200ohm base resistor. The copy I made worked just exactly as yours did with 238v output from the single wound secondary.

But the system turns on somewhere between 500ohm and 250ohm. I saw the system turning on, but did not think to measure it.

anyway, I do not think this says anything about the secondary yet.

Thank you for getting the resistor.
I have been thinking of shorting mine around the resistor.

Do you think it will break it to do that? I wonder why RS made it that way.??

thanks,

jeanna

[jeanna]

Jeanna:

That is a beautiful light there!  Where did you find that?  And, how much? 
...
  I want to get one of those to play with.
Bill

Thanks Bill,
I like it a lot.
I got it at the Quantum thrift store.  (= you must focus on what you want then you will find the very thing inside the doors.)

Do you remember when we were kids there were some older schools, probably the high school, where the overhead lights were black iron with a globe at the bottom? (movies from the 40's have these shown too.)

This may not be the very thing, but it could be. It is about the size of my head.

The thrift store halves the price if something is not sold in a month. This had not sold for 2 months so the $1.35 price in April turned into 35cents...I let her round it up a nickel..

Pretty good.

I think I saw it but was unwilling to pay $1.35. Also, I made a little joule thief with secondary and 4 leds in an altoids box. I showed it the day I made it. I remembered to bring it with me the other day and I could test it for brightness. Sometimes these etched glass globes are too dense and don't let any light go through. I have a few of these- mistakes.

My plan with this is to make an array of 40 leds going in a hemispheric way inside the globe. I am still thinking of how to do that.

thank you,

jeanna