AC from Joule Thief Secondary/pick-up

[jeanna]

i have a goody i posted next door .

That really is a goody.
I need to go for an hour. When I return I am going to try that immediately.

very cool

thanks,

jeanna

[Mk1]

@Martin

Just so you know , usually we use 1.5 volts in the experiment done here , and we use a secondary one a regular jt , the same way you sue your transformer to make a inverter.

I bet with 12 v you already got over 200 watts .


Mark

[nueview]

this circuit uses three coils and two transistors size and core do not really matter it can be an air core if you would like or a ferrite bead or a transformer some will give higher frequency i am sure i will work from the transformer stated above it's primary is 120 volt and the standard secondery is 24 volt and center tapped the darlington pair transistors are used to drive the two haves of this secondery in opposite directions the battery is connected to the center tap and this will give a positive at either end of the two secondery coils were the transisters are placed so that it willdrive the two halves one will be on the other off like a flip-flop oscillater . the bases are connected to the primary 120 volt side at one end so that as it move pos and neg it will be driven to fire the appropriate transistor and turn off the other these bases have a common connection to the 120 volt coil through resisters and cap or caps depending on your transistors the other end of the 120 volt coil can be connected to ground through what ever you want to drive another coil or a flourescent tube lights so on.  i think i still have it on breadboard in one of my boxes so will see if i can dig it out and post it with a picture.
DO NOT TOUCH THE END OF THE PRIMARY SIDE WITH ANYTHING BUT INSULATED PLIERS AS IT WILL BURN YOU LITTERALLY

Martin


MK1
you got the idea but i drove my transisters from the output side with a feed back everything else is the same though.
good luck and enjoy.

[jeanna]

Well everybody,
This is interesting,

I have a MK.8 in the bjt spot with everything set up. (I was tuning it with a hi value pot and it is high frequency low voltage now)
On the scope it reads 43-44v (128KHz) across the secondary wires.
I added the magnet and it jumped down to 14volts!!
I moved it around a bit and in some places it got even worse!
So, I guess it may not always work. Or it may make the frequency even higher, which is what happened when kubikop added a magnet to his on the youtube video.

But, this is what this post is about:
This MK.8 has another secondary wrapped around it.

It has only about 8-10 turns and the wires are right on top of the others.

This other secondary is just wrapped in a straight coil and when I look at it alone, it has the usual lousy ___/\___/\___
type of wave. It is 14volts by itself.
BUT, I decided to add the 2 wires together in series, just to see. (I had made this winding for another reason so I never tried this before)

They added together to become 50volts! OK that is good...

Better than that, the wave of the 2 together was the same excellent wave that the MK.8 has.

Now, this means, if it follows with others, that I can start with a MK1 design and add more layers over for a higher voltage but I do not need to bother with the fancy winding.

Or, I can start with a long regular winding like a spool of wire for instance, and ADD the mk1 type of winding on top of it and add it in series.

Now, Mark, this brings me to a question I have had for a long time.

You said way back that you devised the MK2-MK16 because you found the voltage was better that way. You said you found you could not add to it and get as much more as when you wound the extra wires together.

Can you give any more statistics than that?
Do you have any  numbers from your experiments?

I am asking because I can add to this MK.8 and probably fill it up with wire like the "zebra with kynar". (a very little toroid that pumps out 68volts. with 74 secondary turns).

It is possible that this multiplication of ac voltage is easier than I am supposing.

thanks,


@Martin,
If I am following you, you are putting in 12 volts into your inverter and getting 120 volts out. Is that right?

MK1
you got the idea but i drove my transisters from the output side with a feed back everything else is the same though.
good luck and enjoy.

Oh wait.
You are putting the output back into the input?
Please be more specific.

jeanna

[Mk1]

@jeanna

Try the magnet one the one with the jt coil on one side , it is not for the mk type sine i took care of the dead spot with the 180 coils. but this is helpfull with the altrez type design. try with the big one also if the magnet is too strong it will send the excess into space.

Mark

Edit jeanna i believe they can be put together easy if you reverse the phase , it would be easier if the second pick up coil is wound in starting at the opposing end.