Joule Thief

[Cap-Z-ro]

Just a thought...would running the transistor parallel with the line lessen the heating problem ?

Regards...

[nievesoliveras]

@ nievesoliveras

I do not think your Tesla JT circuit is correct yet. It may work if it is hooked up per diagram I posted.

Congratulations on the CLF. It looks very bright to me. They will not be as bright as when powered from wall since they are not getting as many watts.

I made some experiments with different transistors and resistors and it works for a fraction of a second always when I disconnect the base resistor an connect it back again and this without any resistors.

With it works for a fraction of a second I mean the led flash when the base cable is disconnected suddenly. It does not matter with which transistor.

Jesus:

Nice work!  I agree with Xee2 that it looks very bright to me.  Also, I noticed you still have your 2 neons in the circuit at the same time.  They take volts and some power to light so maybe you are robbing yourself of this circuit's true output potential. (No pun intended)  Just a thought.  I know they are used in my Bedini circuit to protect the transistor but they only light when I have no out put hooked to the circuit, not when operating it normally.

Bill

The 2 neon bulbs are not taking any voltage from the circuit because they are working each with only one leg connected to the joule thief flyback pickup coil.

Maybe you both are right though.

Jesus

[electricme]

@Jesus,
Congratulations lighting that CFL, nice.

With the tesla coil, transistor getting too hot, try connecting a 1ohm 5Watt ceramic resistor in series with the collector, transistor should now run cooler.

@IST I saw you 6 minute Youtube on your Neo Zap, nice white glows there 

jim

[nievesoliveras]

Jesus


Just  a thought  about the   Tesla  coil  JT

A Tesla coil has  to be loosly  coupled  so that the secondary  can  run at high  frequency .
I think  your  Tesla coil JT  would run  if you moved the  base  coil   closer .......and maybe tightened  it up a little .
A  JT needs to be tightly coupled   because it is  low  power .


gary

I think that you are right. I thought that maybe adding a ferrite core it will work. It only flashes the led when I disconnect the base wire suddenly.

Very nice jesus,

Lighting the cfl is no mean feat, even with 9 volts.
Does that mean you were not able to get the circuit to run with less?

The heat is a problem, though.
To me, at least, the heat means there is something wrong.

There might be a short somewhere not allowing the transistor to turn off. (as Bill suggests, perhaps it is the neons.)
I wonder if they are bleeding off the back spike that turns the transistor off.
There could be a base resistor adjustment that is needed with the 9 volts.

Does 1.2 volts battery heat up the transistor also?
...Just some thoughts,

Anyway, congratulations on the cfl, with 2 neons!

jeanna

It works from 4.5 volts to 12 volts, but at 12 volts the heat is too much.
With the 1.2volt the transistor is not hot.

i do agree jesus great work ...

about the im no good at teaching ...  i so know this too well ...   

thats why im happy for this site to make it a easer job as a team ...

cuz none of this came easy ..  but i was driven by something i can not explain ......

ist!

Thank you @ist !

Just a thought...would running the transistor parallel with the line lessen the heating problem ?

Regards...

Pardon my ignorance but I dont know how to run the transistor parallel with the line.

Jesus

[nievesoliveras]

@Jesus,
Congratulations lighting that CFL, nice.

With the tesla coil, transistor getting too hot, try connecting a 1ohm 5Watt ceramic resistor in series with the collector, transistor should now run cooler.

@IST I saw you 6 minute Youtube on your Neo Zap, nice white glows there 

jim

It is a pity that I sent for 5w resistors but I did not know about the 1ohm resistor, if I knew before I would have sent for at least 4 of those resistances.

Lets see what I can do with what I got now.

Jesus