Joule Thief

[electricme]

@Jeanna,

Jim,

Didn't you make this a while back... then something happened to the switch... then I never heard about it anymore??

I am glad it has returned.

thank you!!

jeanna

Gary,
Those are the best discoveries. Then you know you are on to something!!
Are you using welding rod too?

jeanna

Yes, this was my research secondary, I made this to be placed on any JT so I could have a selectable voltage range to play with.
The switch actually fell apart during assembly, it seems this type of multy pin switch can be made to have a variety of different poles, eg 1 pole 2 pole 3 pole 4 pole.

I have it configured as a 1 pole switch, 12 inputs, 1 output.

By soldering all the tap points to each out/in in turn, when I select any of the 12 positions, I get just the voltage out of the toroid I need.

There is only 2 separate wound coils in this one.

The 1st coil takes its power from any JT secondary output.
The second coil is the one which has the selectable tap points.
*************************

Another way to do this is to wind a single large coil, the "tap" coil, directly on to a joule thief itself, then it would be the Primary output coil, but it would have several an adjustable outlets which you can control by a rotrary switch.

You could really now have more control of the energy coming out of the Joule Thief itself, (no more blown LEDs) as you could select the output energy to everything connected to the JT.

In the case of MK1s 2 secondaries, setup, I would just wind them in the same manner, going up and down each side, with tap points in between, but I would only have the tap points on the downward leg, not the upward leg. (unless you find you need more control of the outputs).

This raises the possibility of having a "duel" or "double controlable output, so you would need a duel gang switch, and I have seen them in the various kits and electronic suppliers.

see photo (which I have to make) 

jim

One ant seems to have been on "walk-a-bout"

[resonanceman]

Jeanna

I am glad that you understand now

I find that  when I  try to explain something in detail        I end up learning it all over again at a deeper level .


Now ........a question I have to ask is .
If  we can use the entire coil as a secondary  on the one wire  LM ........why can't we use the whole  coil every time with every JT ?


gary   

OK

I have  the  primary and secondary in series  It  does not seem to help the voltage much ....  I didn't check the  current .

My  new coil is helpfull .....................but I will have to make a bigger one.
With this  coil  it is my LED array is brightest  with  my new coil maxed out .......  all 300 ft   plus 3 toroids and  2 magnets . 
The good thing is before  it took   4 or 5 coils in series  to get this much light 

For this setup I am using  one of my original  LMs    that is 300 ft  of   #30  wire and a primary  of  8 turns
I am using only  my new   multi  tap   coil for flyback .

gary

[electricme]

@all,

The circuit below compliments the one above.

This one below allow you to configure the Adjustable supply out as a Posative, Earth, Negative, but it is the  pulsed DC component now at high frequency.

You could place a BRIDGE rectifier accross the Top and Middle outs AND accross the Middle and Lower outputs, so giving a full rectified DC at Hi Hz.
****************************

You could now drive 2 seperate JT primaries or by combining the outputs have "double" the current avaliable to light LEDs or anything else that would work with this configuration.

jim

more to come on this topic

[resonanceman]

OK

I have  the  primary and secondary in series  It  does not seem to help the voltage much ....  I didn't check the  current .

My  new coil is helpfull .....................but I will have to make a bigger one.
With this  coil  it is my LED array is brightest  with  my new coil maxed out .......  all 300 ft   plus 3 toroids and  2 magnets . 
The good thing is before  it took   4 or 5 coils in series  to get this much light 

For this setup I am using  one of my original  LMs    that is 300 ft  of   #30  wire and a primary  of  8 turns
I am using only  my new   multi  tap   coil for flyback .

gary

It  looks like my multi tap  coil is  worthless for feedback to source .....if I try to use  it as  a secondary (while  I am  using it for  creating flyback ) even  just one  winding  the  output  drops  allot .


gary

[jeanna]

OK

I have  the  primary and secondary in series  It  does not seem to help the voltage much ....

It may change the frequency. You have a frequency button on your meter, don't you?

For this setup I am using  one of my original  LMs    that is 300 ft  of   #30  wire and a primary  of  8 turns

I was thinking we/you could use one of those fuji transformers that has 1700 turns in one of these tests.

I am using only  my new   multi  tap   coil for flyback .

I have always assumed when you say flyback that you mean the same thing as back-emf.
I am asking just to be sure.

So, you put the new coil in with not a series connection as much as a connection to the tap - wherever the tap is, and this makes the whole thing oscillate.

Am I getting there?
In my mind there is one wire left without a connection.

jeanna