AC from Joule Thief Secondary/pick-up

[jeanna]

@jeanna

I did some tests with a toroid already done I had. I t is 2b-8c.
It lights a yellow led brightly.

I added only one turn and try the two leds inseries. Nothing.
I changed the wire and wound 6 turns and try again the two leds and nothing I took one out and checked and nothing.


Jesus

You are right to be testing with only one led for one turn. It will not go on at all if it is trying to turn on 2 in series.

I hope I can do something in today's heat. I will try to do what you are doing to see what must be done with the medium 5/$1

I am sorry this is causing you dificulty.
Someone else watching may be getting help from your troubles, so we will keep on trying.

Are you using a 2N3904?
a pot?
No feedback or any of that for now?

To review.

You light the yellow.

You then:
remove the yellow and add it to another spot and just touch the sides of the led legs with the ends of the wire. If it does not work, use the wires in the opposite way.

Is your battery a dead one?
You might start this with a good battery.

I do find that even though the secondary uses so little amps draw, it does work better with a charged battery.

Also, even though you will get the lights on in the same way, the regular leds do not have the phosphors that make the bright whites so bright at high frequency.

OK keep trying things.

I will try some things too.

jeanna

[nievesoliveras]

You are right to be testing with only one led for one turn. It will not go on at all if it is trying to turn on 2 in series.

I tried it single and both ways and nothing.

I hope I can do something in today's heat. I will try to do what you are doing to see what must be done with the medium 5/$1

I am sorry this is causing you dificulty.
Someone else watching may be getting help from your troubles, so we will keep on trying.

Are you using a 2N3904?
a pot?
No feedback or any of that for now?

I have used a 1905 pnp, a 3904 npn, a 4401 npn and a 2222 npn.
There is no feedback wires, only the 18 inches wire with 6 turns.

To review.

You light the yellow.

You then:
remove the yellow and add it to another spot and just touch the sides of the led legs with the ends of the wire. If it does not work, use the wires in the opposite way.

Is your battery a dead one?
You might start this with a good battery.

I am using three batteries pack.

I do find that even though the secondary uses so little amps draw, it does work better with a charged battery.

Also, even though you will get the lights on in the same way, the regular leds do not have the phosphors that make the bright whites so bright at high frequency.

OK keep trying things.

I will try some things too.

jeanna

thank you @jeanna !

Jesus

[jeanna]

I have seen the 3 battery pack.
Is that 4.5v?

I know what is wrong!
I hope.

You have more turns on the C than on the secondary.
Just see if you reverse theB and C and find out if things change.
I had to do that to start up the biggo. It refused to start until I put a lot on the B and a little on the C (which is opposite what xee's research has been finding)

Please try that.

Thanks,
jeanna

Sorry, I was making changes to my JT I missed your reply.

[Bubba1]

I am, but sometimes the tip cools before I get it to the sponge. Is that all the reason for the problem I am having?
That sure is an easy fix if it is.

Thank you,

jeanna

Maybe I'm dense, but I don't get it.  Why does the tip cool before you get it to the sponge?  Do you unplug it?

[nievesoliveras]

I have seen the 3 battery pack.
Is that 4.5v?

I know what is wrong!
I hope.

You have more turns on the C than on the secondary.
Just see if you reverse theB and C and find out if things change.
I had to do that to start up the biggo. It refused to start until I put a lot on the B and a little on the C (which is opposite what xee's research has been finding)

Please try that.

Thanks,
jeanna

Sorry, I was making changes to my JT I missed your reply.

Lady @jeanna you were right.
The collector coil had more turns than the pickup coil and that was the problem.
I could light just one led with the 6 turns pickup coil, but that is an improvement, because, I could light nothing before I switched the base and collector coils.

Thank you!

Jesus