Joule Thief

[TheNOP]

@theNOP,
Somehow, many times you seem to be talking about something different from what I am talking about.
So, just to be very clear about my set-up,
There is NOT a cap attached to the ends of the secondary.

i know, you was talking about a cap in parallel with the base's resistance.

i have a tendency to anticipate things a bit.
sorry about that.

while this does not directly apply to the way you are testing :

note that things will not be exatly the same with a load on the pickup coil(s).
a cap is only a load while charging(acte like a variable load).
once charged, it is not a load anymore, unless you discharge it.

they are still good hints for your future experiments.

the first can be applyed to your actual circuit(s) at anytime.
the second was a warning about thinking caps are always a "load".

maybe i am trying to go too fast.
sorry again.

[altrez]

@all

I need some help winding coils. Can anyone suggest a good way to keep the coil in place? Right now I am using electrical tape and it looks bad.

How can I get a good looking coil? Do I need something sticky on the toroid to keep the wires down? I am using the red radio shack mag wire for my pickup coils and as soon as I let go of the wire it spaces out. I was going to try some super glue but did not want to ruin the toriod? How are you guys getting such good looking coils?

Thanks!

-Altrez

[jeanna]

Perhaps you can look at the voltage across the base resistor (which is also the voltage across the base capacitor). This should build up slowly until the transistor turns on and then drop sharply when the transistor turns off.

Surely you jest!
At 312 KHz +, +,  I probably can't see the dmm move that fast! 

Actually the voltage there is 1.35v while without the cap it is 1.2v and the battery alone is 1.27v

I think I have done enough tests on this toroid with this primary.
I will wind it into a MK1x2 now.

@Altrez,
You will have to ask Hazens how he makes his if you want that look.
You can get the wire fairly tight and even if with each angle of the turn you pull it tight around, so I am saying 3 or 4 times per turn you tug and straighten. Even so, I have not been able to achieve the look Hazens gets.
I have used a tiny crochet hook to pull the wire through. It doesn't get the kink that it gets when you "sew" it through.
good luck,

@theNOP, OK I see.

Thank you all,

jeanna

[xee2]

@ jeanna

Surely you jest!
At 312 KHz +, +,  I probably can't see the dmm move that fast! 

Yes, using a DMM would be hard. Good thing you have a scope.

[electricme]

@Jeanna,
For the next 2 days im at a PC that has a broadband connection, I want to download the Tesla information you mentioned, (I have taken a quick looksee but I must of missed where you posted it,  the red forum background is throwing me). If you still have the http address to it, would you mind posting it again please, and if there is other items on Tesla avaliable, could you send those addresses also.

I can see some really great studdy coming up.

@Stefan,
Thankyou for putting the smily icon back, I did miss it. TA

jim