Joule Thief

[jadaro2600]

It's fairly well known that the coils on the Joule Thief coerce one another into functioning at resonance - resonance itself being a common occurrence, doesn't it stand to reason that if there are two minds - two electrical bodies within distance of one another, that some coupling might occur?

I was just thinking of the Stubblefield arrays, and I've recently got a few spare dsl filters laying around that have the inductors in them, I'm thinking they would make a good test device.

[innovation_station]

well i guess im gonna build a mot unit 

but i will build it a wee bit diffrent than i already have ..

just like a jt but i want to trap the colpase in the trsansformer  so i need some kind of heavy diode

i will force the colpase out the primary winding  i will use the center pancke style winding as a primary and the secondary as a trigger ..  and the core as the resistor   because of the high inductance the secondary will not allow it to flow to the battery or transistor on the driveing side of the transistor we want to block it so it can not feed back and blow the transistor then the power has but 1 path 

yep right through the bulb..... 

ist

see how it goes

[xee2]

@ jenna

@xee,
I will change to 3 turns if you do. I would much rather keep the 2:10 ratio and I would rather have that be the same, than be able to turn on my toroid with 2Kohm base resistor. Most of the time the optimal base resistance is below 500r anyway., So, those are my reasons to not add the 3rd wind, unless you need it for any reason.

It may just be a more flexible 3055 at your end or a more highly charged battery, or something like that... You are using a battery are you not? I mean you are not using a 1.5 power supply plugged into the grid are you?

I am using a AAA battery at about 1.3 volts.

You are correct, the transistors may have different gains. The spec has a wide window.

I only posted this circuit to show you that the 3" toroid would work with 2 base turns. If you want to use 2 base turns that is OK with me. But I recommend 3 turns. Although I have not seen any big difference in output voltage between 2 and 3 turns on the base.

I am getting about 250 volts with a 1000 pF output capacitor. It seems that to double the output voltage the turns on the pickup coil need to be increased by 4. So if I go to 80 turns it should light a fluorescent tube. My next test is to see if this is true. This means I will be destroying my current toroid unless you have tests you want us to do with that configuration. Please let me know.

[jeanna]

...But I recommend 3 turns. Although I have not seen any big difference in output voltage between 2 and 3 turns on the base.

.... So if I go to 80 turns it should light a fluorescent tube. My next test is to see if this is true. This means I will be destroying my current toroid unless you have tests you want us to do with that configuration. Please let me know.

Xee,
I am wondering if you can get the very high voltage I got at about 33.8 ohm?
I didn't try for this with the solenoid type pickup and I am wondering.
I am not sure it matters if you do it now or later, but I may ask you later!

80 turns. This will be interesting... Are you planning to make them just straight as I guess you call solenoid?
You will have plenty of room. I guess you will use up about half of the toroid.

It will be very telling to see how this works. I am looking forward to see your results... the yes ones and the no ones.

Thank you,

jeanna

[Pirate88179]

A buddy of mine on Youtube posted this and asked me to bring it to your attention:

http://www.youtube.com/watch?v=Mxa_G4X8Y7k&feature=related

He did not film this and it is in some language I do not recognize but it is what appears to be an earth battery, joule thief, spark gap (Jeanna will like this) and God knows what else and they are lighting about a dozen incandescent bulbs from it.

It is a 7 part series (the link above is for part 1) and maybe someone here will be able to figure out what they are saying.  It is very interesting to say the least.  I can't quite figure out what they are doing even though I recognize some of the components.

Bill