Joule Thief

[xee2]

@ kooler

Good thing I bought 50 of these bulbs. The first one now has a vaporized filament that made a very bright flash, like a camera flash, when used in this circuit.


EDIT: drawing is wrong, they are actually 25 amp pulses (before the bulb blows).

[jeanna]

Wow, xee2, maybe you need more in series!
That is cool to have that kind of problem with a filament light.

==============

@All,
I just modded the 13w cfl I bought the other day but didn't use.

...then the 10wcfl I bought today so I might have a true replication of lidmotor's jeanna's light.

They are both a lot brighter than the 20w, but they shed no more apparent light in the room than it does.
I cannot put these in series at all.
So, there can be only 1 cfl per circuit so far.

I am glad I did this, because I am now getting the range of dimming that he was getting from the 20 ohm rs dimmer switch at the + battery end.

I will do a duration test on this one as well.

I got 2 alkalines with my new camera and this will give one of them a job to do.

jeanna

[Pirate88179]

Jeanna:

Thanks again for that link.  I ordered 1/2 pound of mag wire (28 gauge, 1 red one green)  I think this will work just fine because, in the specs, the "newbie" wire has a much thicker insulation for beginners to wind with to prevent shorts.  Now, I don't know the dielectric strength of the urethane insulation (I guess I could look it up) but, simply, thicker is better to insulate high voltage at whatever value.  I think this will work great.  My primary is going to be insulated solid copper wire (low resistance) 20 gauge that I bought by mistake a while back thinking it was stranded.
My Jeanna Light will be running soon!  (I hope)  today, I also bought a 13 watt cfl for my box.  That was the smallest the store had.

Bill

[jeanna]

Jeanna:

Thanks again for that link.  I ordered 1/2 pound of mag wire (28 gauge, 1 red one green)  I think this will work just fine because, in the specs, the "newbie" wire has a much thicker insulation for beginners to wind with to prevent shorts.

It may be the reason I had no problem with the over 1400v I was getting the other day,?

...
My Jeanna Light will be running soon!  (I hope)  today, I also bought a 13 watt cfl for my box.  That was the smallest the store had.

Excellent!

Now, I am waiting for the box.
If it is a good one, I will share the specs.

I hope to see a picture of this tonight!

jeanna

[gadgetmall]

@ kooler

Good thing I bought 50 of these bulbs. The first one now has a vaporized filament that made a very bright flash, like a camera flash, when used in this circuit.


EDIT: drawing is wrong, they are actually 25 amp pulses (before the bulb blows).

Xee2 Very Nice . I have to ask what is being drained from the battery . Its got to be over 300 milliamps . In this case a 2000mah battery will only last a few hours . No ? What would be the advantage Verse running the bulb directly with the AA battery ?