Joule Thief

[nievesoliveras]

Jesus:

That is not the type of bulb Jim was talking about.  What he meant was just a simple, Edison based tail light bulb that works on 12 volts.  They should be a pretty standard item of either a GE 1157 or 1159. 

Bill

Thank you bill, but I said that I was going to experiment with what I got available and that was what I did.
Then reading from the catalog I got the bulbs it says that it is a 12v halogen 50 watts.
I will keep searching among my buckets salvaged and bought parts looking for  the light bulb and a buzzer for another experiment.

Jesus

[jeanna]

@ist,
That was an amazing spark!
It seemed to shoot straight out of the copper stick.

When you say 4 amps, is that what it was drawing from the power supply or was that just the amount available?

@jesus, hmm there is hope yet.
I wonder if it will work with a regular 12 volt light bulb.
I was waiting to see.
I do not understand this principle of using a bulb to protect against overheating. It seems to me that you are using the tesla coil and your circuit to light the bulb.

I guess lighting a halogen is an amazing accomplishment in its own right, though , isn't it?

I am sure you will get it. You have the persistence that you need.
Ist made a good suggestion.
In working with my 2 tier circuit, I have been helped by the fact that I have one that is almost exactly the same as the main one.
It picks up the resonance perfectly, as you might predict, and perhaps because of that, everything works together.

But my question remains:
Are you sure the transistor is switching off?
Perhaps it would if you put more turns on the base?

I made this little video to clarify my Scope shots on the datalogging page.

http://www.youtube.com/watch?v=xfwMFrqGtaE
enjoy

jeanna

[Pirate88179]

Jesus:

I understand.  I don't know how it is there, but here they even sell these in the grocery stores for less than $1.

Bill

[xee2]

@ jeanna

Good video. I could even read the scope screen.

[xee2]

@ ist

I am not sure I understand what you are doing. Is this correct? Probably not.