Big Joule Theif

[Tectalabyss]

Two JT's

Hi folks, hi jeanna, thanks for the reply. Here is a couple pics and the 2 coils on the larger toroid are not used.
peace love light
Tyson

Hi Skywatcher.
I like your setup. Jeanna's explanation Is the best I've heard on JT's. Tec

[SkyWatcher]

Hi folks, hi jeanna, thanks for the reply. Here is a couple pics and the 2 coils on the larger toroid are not used.
peace love light
Tyson

[xee2]

Is there any way to measure it with a meter?

I am not an expert on car ignition coils. But, I would guess that if the primary resistance is less than 1 ohm then there is no internal resistor.

[jeanna]

Hi folks, thought i would share what could be novel results, though would like to get some feedback as to whether others have seen similar effects and your thoughts. I am using 2 toroids tied together like another fellow did in a youtube video, though i am using one toroid made from steel enamel coated craft wire at about 4 inch diameter and the other toroid is from a computer psu at about 2 inches diameter, ferrite i think. And tied the 2 together with 24 gauge magnet wire with maybe 200 turns, then on the smallest toroid adjacent to 24 gauge coil i have the bifilar 18 guage self oscillator joule thief type setup, though wired bedini style. The result is that when a load is applied the input amps drop and when the secondary which is tied between the 2 toroids is shorted, it drops even further. Though this may be simply back emf fighting against my input voltage causing this, however when i put 6 leds as a load on secondary i can adjust input by lowering base resistance which increases leds brightness yet input amps stay the same and at some points, drops a little bit. At 6 volts and between 15-20 milliamps input, it lights up the 6 leds to almost full brightness. Your comments are greatly appreciated.
peace love light
Tyson

Hi Skywatcher,
I would need a picture to be very sure about your set-up.
I can, however say that this is totally normal when using the secondary from a joule thief.
I have no idea if you are gaining any benefit from the complex of toroids (unless you are able to wind more turns onto your secondary).

In general the battery of joule thief runs a transistor and if there is a secondary winding sharing the same toroid as the joule thief bifilar, you will get high voltage on that secondary which is unaccountable by normal transistor equations; and, the effect of what you draw from that secondary has little to no effect on the draw from the battery.

That said, it is important to remember that a transistor can use considerable amps from the battery.
Lidmotor showed me to put a rheostat coming right off the battery to lower the draw.

I hope this answers at least some of your question.

jeanna

[nvisser]

Is there any way to measure it with a meter?

[xee2]

There is a resistor in an ignition coil?

Some have it and some do not. Most have it.

[nvisser]

Toroid is 1" diameter (in small print on web page). I have used a small ignition coil with no internal resistor in place of the trigger coil and that worked very well. I have not tried a standard size car ignition coil, the internal resistor may degrade performance.

There is a resistor in an ignition coil?

[SkyWatcher]

Hi folks, thought i would share what could be novel results, though would like to get some feedback as to whether others have seen similar effects and your thoughts. I am using 2 toroids tied together like another fellow did in a youtube video, though i am using one toroid made from steel enamel coated craft wire at about 4 inch diameter and the other toroid is from a computer psu at about 2 inches diameter, ferrite i think. And tied the 2 together with 24 gauge magnet wire with maybe 200 turns, then on the smallest toroid adjacent to 24 gauge coil i have the bifilar 18 guage self oscillator joule thief type setup, though wired bedini style. The result is that when a load is applied the input amps drop and when the secondary which is tied between the 2 toroids is shorted, it drops even further. Though this may be simply back emf fighting against my input voltage causing this, however when i put 6 leds as a load on secondary i can adjust input by lowering base resistance which increases leds brightness yet input amps stay the same and at some points, drops a little bit. At 6 volts and between 15-20 milliamps input, it lights up the 6 leds to almost full brightness. Your comments are greatly appreciated.
peace love light
Tyson

[xee2]

@ nvisser

Hi Xee2
Could you give me the size of the toroid core as I cannot find it on the goldmine website
Do you think a normal carcoil will also work as high voltage transformer?
Thanks
Vissie

Toroid is 1" diameter (in small print on web page). I have used a small ignition coil with no internal resistor in place of the trigger coil and that worked very well. I have not tried a standard size car ignition coil, the internal resistor may degrade performance.

[nvisser]

This may not be something that should be posted here since it is not a big Joule thief. But, it is another way of lighting a CFL with a Joule thief and it only needs 22 mA at 1.5 volts to do it (and it is simple to make).

trigger coil = Ferrite High Voltage Inverter Transformer-The Electronic Goldmine

toroid = Medium Toroidal Ferrite Core (Pkg of 5)-The Electronic Goldmine

Hi Xee2
Could you give me the size of the toroid core as I cannot find it on the goldmine website
Do you think a normal carcoil will also work as high voltage transformer?
Thanks
Vissie

[Lidmotor]

Thanks xee2

This may not be something that should be posted here since it is not a big Joule thief. But, it is another way of lighting a CFL with a Joule thief and it only needs 22 mA at 1.5 volts to do it (and it is simple to make).

trigger coil = Ferrite High Voltage Inverter Transformer-The Electronic Goldmine

toroid = Medium Toroidal Ferrite Core (Pkg of 5)-The Electronic Goldmine

I had the exact transformer from Electricgoldmine so I built this circuit and played with it ALL DAY!! The circuit that I have been working on over at Jonny's 'Simple SEC' thread kinda uses the same idea. On that one a 555 timer pulses the transformer but on yours the Joule Thief does it. Beautifully simple idea ---well done.
Putting the primary of the transformer in the circuit the way you did it works great. My 3.7v to 110v wall transformer running backwards worked also.
You can put a switching diode off the transistor collector and get a great BEMF charge at that point.
Thanks for posting this.

Lidmotor

[Tectalabyss]

Thank's for sharing

This may not be something that should be posted here since it is not a big Joule thief. But, it is another way of lighting a CFL with a Joule thief and it only needs 22 mA at 1.5 volts to do it (and it is simple to make).

trigger coil = Ferrite High Voltage Inverter Transformer-The Electronic Goldmine

toroid = Medium Toroidal Ferrite Core (Pkg of 5)-The Electronic Goldmine

That's a simple and easy way to run a CFL with 1.5 volts Thank's a lot for sharing this ideal. Tec

[xee2]

low power CFL ciruit

This may not be something that should be posted here since it is not a big Joule thief. But, it is another way of lighting a CFL with a Joule thief and it only needs 22 mA at 1.5 volts to do it (and it is simple to make).

trigger coil = Ferrite High Voltage Inverter Transformer-The Electronic Goldmine

toroid = Medium Toroidal Ferrite Core (Pkg of 5)-The Electronic Goldmine

[CosmicFarmer]

@Jeanna
Wow! Availabilities. I like that design that is available on my birthday!... Maybe I will get myself a present.

So just a little resonant math for you Jeanna, at a 3/9 turn ratio oscillator (or substitute what you think is optimal) how many turns on the secondary to recharge a AA cell with an MPSa06? (1.6v or more )

You don't have to be specific but I have a guess that the turns ratio is interesting. Just basically asking volts per turn at that core material ZW-46113-TC. What I work with has about what seems like .3 or .4 volts per turn or less.

Thank you for your private investigation into the factories!

[Tectalabyss]

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Also you know how the florescent blub's have two wire's on each side.I found that if you only use one on each side they are a lot brighter,I know most of you knew this but thought I would share for any who didnt. Thank's Tec