Joule Thief

[Mk1]

@stprue

Nice looking pickup coil , but that is not it. Check the drawing included in this post.

But basically you go one way then go down putting the between the ones you put on on the way up. They only cross on the inside of the toroid , but don't think about that .

Also make a pickup coil on the other side of about 12 turns and check voltage on it .


Mark

[jeanna]

Get ready! 

Look at the pic's closely and I won't have to answer as many questions!  Nothing great, it works but I'm sure it is wound wrong.  The good news is I have lots of pic's of my mistake so other people won't make the same one

So,
My first question is what is wrong?
What stage are you at?
It appears to be get the jtc to light a led in the BJT spot, and you did.
You have 4.5?ohm K or M or is that 4.5 ohm?
The green looks fine even if you cannot wrap your hands around making the straight line on the outside, I don't see any crosses on the inside, so there is only one cross per return wire so it is OK.
umm.
So what is the problem There is a rather large number on a meter in one of those shots. Is that volts? looks pretty good.


(I never did well in multiple choice. My imagination gets out of control with all the possibilities.)

jeanna

[stprue]

@stprue

Nice looking pickup coil , but that is not it. Check the drawing included in this post.

But basically you go one way then go down putting the between the ones you put on on the way up. They only cross on the inside of the toroid , but don't think about that .

Also make a pickup coil on the other side of about 12 turns and check voltage on it .


Mark

So my first mistake is when I'm on the return, my crossovers are on the inside?  Ok...so the outside is all looking like \\\\\\\\\\\\\ and the inside is looking like XXXXXXXX?  Ok.. do you see on my pick-up I'm actually going over 2 wraps...the one I just went in between and the next wire I will next be going in between......Is that right because I don't think so?  I will check out the page you told me to.

Thanks...Stew

[stprue]

So,
My first question is what is wrong?
What stage are you at?
It appears to be get the jtc to light a led in the BJT spot, and you did.
You have 4.5?ohm K or M or is that 4.5 ohm?
The green looks fine even if you cannot wrap your hands around making the straight line on the outside, I don't see any crosses on the inside, so there is only one cross per return wire so it is OK.
umm.
So what is the problem There is a rather large number on a meter in one of those shots. Is that volts? looks pretty good.


(I never did well in multiple choice. My imagination gets out of control with all the possibilities.)

jeanna

It is 4.5 ohms and the large number is actually 3.um something volts ac so I'm getting 20+DC and 3.whatever ac.  The two pic's of the led lighting are before the bridge and it will light both ways.  I just responded to Mk about the wrapping...I though it was going over twice...look closely!

[Mk1]

@stprue

I made a new drawing for you . only one wire the color is to indicate the direction .