AC from Joule Thief Secondary/pick-up

[jeanna]

@jesus,
Oh no.
It is much easier than that.

Make sure when you wind your secondary to wind 4-6 turns for every led you want to light in series. (long leg-short leg-long leg-short leg etc.)

So, if you want 6 leds which is a fair amount of light, you will plan 36 turns for the secondary. If you make more than 36 turns you might pop all of your lights the moment you turn it on.

So, for example the way I do it is
on a breadboard, tune the toroid and get it right with a 4 turns secondary,
then continue to make 32 more turns until you have 36 total.

now put 6 leds in series on a breadboard...

Connect the ends of your secondary wires to the beginning and end of the series of leds. (remember they have some polarity even with this high frequency.) So, if they do not turn on one way reverse the wires.

If they are REALLY bright, add one more and see if they change. They should get a little bit dimmer.
If they do not get dimmer keep the extra one there or take out one or 2 turns.
You should have between 4 and 6 turns for each led.

I hope I said it clearly. If I didn't please ask again.

jeanna

Here is a pic of me in january or december lighting 6 leds from a secondary.

http://www.overunity.com/index.php?topic=6942.msg161452#msg161452

[nievesoliveras]

@jeanna

I have already a joule thief done that has 2b-10c-70p.
If the theory is correct I should light approximately eleven Leds.

The problem is I dont have the 11 leds right now.

But according with what you tell me that is what suppose to happen if the 6t/led is correct.

I right now have two leds I need to get nine more. Lets see what I can do.

Or build another toroid with 2b-10c-12p and the two leds should light very bright.

Jesus

[jeanna]

@jeanna

I have already a joule thief done that has 2b-10c-70p.
...

The problem is I dont have the 11 leds right now.


I right now have two leds I need to get nine more. Lets see what I can do.

Or build another toroid with 2b-10c-12p and the two leds should light very bright.

Jesus

Or...
Make another secondary of 12P on the same one you have already made.

Be careful not to mix them up when you grab the ends or you will have only 0 leds   

I have used a tiny piece of tape to remind me which end or which one to use.

This will be fast if you already have one made!

BTW, when I said 4-6 turns I was talking for very bright light. you will see a light with only one turn if you use 1 led, but it is not at a good brightness until you get to 4 turns and not full brightness until you get to 6. Past that, it all depends on the transistor and the toroid etc. But you will be on safe ground.

IN FACT, if you take a piece of mag wire about 18 inches long.
Sand the ends.
Wrap it, but check with a voltmeter across the led after you add each turn one turn at a time. Like this:

Start with only 1 turn on 1 led.
When that is bright after 4 turns, add one more in series and see what that does to the brightness.
Then add another turn until you have your 2 leds at good brightness.
Take notes and pass them along.
I did this for the tor-23
I think you will be doing this with a 5/$1, is that right?

jeanna

[nievesoliveras]

Thats right @jeanna 5/$1 toroid.

I am very tired of studying ignition and flyback driver schematics.
I have an ignition coil and a flyback coil and I would like to get some sparks from them.

I will choose the simplest circuit that can drive the coils.

Jesus

[jeanna]

Thats right @jeanna 5/$1 toroid.
...
I will choose the simplest circuit that can drive the coils.

Jesus

I see.

I am betting on it. Now there are 2 of us!
Yeay!

But just at least get the 2 leds going by using the simple secondary.
The ignition coil is convenient but I think it is a nice thing to have some lights on dark nights even if the other is not yet ready.
I bet it will be very soon.
I am glad you are working on this too.

jeanna