Joule Thief

[jeanna]

Hi everybody,
I have been having a hard time getting the picture right. I am still not sure if my words match my picture.

I am getting pretty great results though.
For a paltry 14T secondary I am getting 35v if I step way back on the scope. I am pretty sure this is what a cap would collect.

@MK1 you may get your wish soon, I just might pull out that bridge and diodes and see how a cap measures against  the scope at close and then also at far range. The scope at far range where the wave is too small to measure, often tells me I have a lot more volts than when I am at a closer range. I suspect it is seeing the spikes from there. These would be the same spikes that a cap would collect.

Here is a pic of my scope showing the strange kind of wave I can get with this dblxx primary winding.
14T secondary lighting 8 or 10 leds while measuring.
250KHz between the markers.

jeanna

[Mk1]

@jeanna

Its not really about me , but you will learn valuable things working with diode , remember the coil tester ?

It really helps to visualize what is happening in the secondary , current flow direction and so on , it will help you make better design form on toroid to the other.

Mark

[jeanna]

So MK1, what do you think about that wave?
I guess you never had a scope?
I can SEE what is happening I don't need help visualizing it. If the peaks go high on one lead and not on the other I can see how the polarity goes. etc.
There is no need for a diode.

Remember I did use this method.
I started to understand what was happening only after I could see it on the scope
We are all very different.

==
@All,

Here is a diagram of the core wound dblxx with 2T on the Collector and 3 on the +; and 2T on the Base and 3 turns on the +.
These 3T parts could be twisted together and can be seen as a center tap.
That is how they are used.

The output is very good.
The wave is very unusual.
This is a lot of voltage on a 14T secondary... almost twice what I usually get on this tor-23.

The screenshot above is from this winding.

jeanna

[electricme]

@Pirate,

Yes, I did get the filament bulb to glow, but that was about all it did.  I was using a car tail light bulb (GE 1157) designed for 12 volts.  I was hitting it with about 9 volts and got a little glow.

I believe Gary is correct in what he said.  These need amps to light and I was hitting it with mA's.  I imagine they are just about like resistance heaters (electric ranges, ovens, water heaters, etc) which need amps. 

One thing I never did try was to hit a 12 volt bulb with about 400 volts from the Fuji.  I doubt it would do much of anything.  I might try it for the heck of it anyway.

Bill

Hi Bill,
Try using a bulb from a torch (flashlight for you chaps), the ones that have a built in lens on the top of the bulb. These have a much tinyer fillament, it will light real brightly.

@all,
I've been away delving into this new Tariel Kapenadze earth battery, learnt a lot there and have had a break through on my bedini, I can make it run by using its own energy.

I believe by a simple/major mod, the JT can also be made to run on its own energy, lol.

I found a cattle prod at the dump, well wouldn't you know, its a joule thief in disguize, the circuit is almost a dead ringer for the JT. It runs on 9v. or 6 C cells. ALL coils are seperate, but I the trigger and load coil is seperately wound but wound bifilar.

The transistor is a 2N5886 in the same TO3 caseing as the 2N3055, and the base resistor is a 235K 235,000 ohms.

To make the JT run on a 9v battery just change the base resistor to the higher value. (you should get a few thousand volts out of it then)


But first I gotta play catch up here.
jim

[Mk1]

@jeanna

ok ,you don't need me you got a scope good for you ...

What do i think of your wave , absolutely nothing , this is all good but what will it do .

Mark