Joulethief SEC exciter and variants

[Zooty]

I just moved to Cyprus from the UK and finding components out here is like finding gold on the pavement. I asked for a selection of NPN's and thats what they gave me. I looked up the specs and like you say its a very high voltage and pretty low hfe but it seems to work very nicely. I was wondering if anyone knows a way to boost the dc current gain without another transistor. A capacitor on the base maybe?

[Jiffycoil]

Hi Zooty
This looks interesting and I'd like to give it a try. Is there a reason you used the BU508AW? I have seen these in TV's Ive scavenged parts from in the horizontal deflection circuits and they have a very high voltage rating to them. I was wondering had you tried other NPN's and found this one worked best?

[Zooty]

Big Bedini/JT with Tesla Switch Style Recovery

This is a Bedini type coil wired like a Joule Thief except the recovery diode goes back to the positive of the charging battery. The Charging battery is also in series with the coils so you need a higher voltage than the charging battery for this to work. The source is 24v and it draws 125ma. The Charging battery charges very quickly and nothing in the circuit gets hot. I am still conducting load tests but i can already tell the battery is doing very well.

[seth]

@ Seth

That is really good performance. Thanks for posting the video.

Thanks guys. Tried to repeat the 1AA feat last night, and it wouldnt work!!! couldnt get a single thing to light without the charger. Exciters can be SOOOOOO changeable. I'll try again today. I agree that low input is where we'll see the most exciting developments with this. Ive been spending a long time playing with plasma at 12V and higher so ive lost the knack with 1AA batteries....i'll have another go today

PS These results were all obtained with a TIP 31C (i hadnt discovered the joy of the mosfet at this point) on about a 350 Ohm resistor

[xee2]

@ Seth

That is really good performance. Thanks for posting the video.

[Jiffycoil]

Nice job Seth.

[seth]

Lager coils seem to work better. My first experiments were with a 1" diameter coil. It would not light the fluorescent tube wirelessly without using a cell phone charger. If I make another coil it will be 5" diameter.

Larger coils have always worked better for me also - I can manage to light a 14W CFL at distances up to 30 cm from L1, with only 1AA battery (no charger)

YouTube - 1.5V wireless exciter.flv

Low input @ high output is always a delight to see!

[xee2]

have you tried on a smaller scale of coils
to limit the cost of building one ???????

Lager coils seem to work better. My first experiments were with a 1" diameter coil. It would not light the fluorescent tube wirelessly without using a cell phone charger. If I make another coil it will be 5" diameter.

[xee2]

Does a top-load help any?

No. I am not sure why, but this circuit works better without a top load.

[Jiffycoil]

Single Wire Transmission Test Slayer Exciter

I thought I would test the new setup and see how far I can transmit energy by single wire.

YouTube - Single Wire Pancake

[totoalas]

This is not much of an improvement, but it does help some. I changed the 1K resistor to 200 ohms and the L2 coil diameter from 4.5" to 5" and moved it to about 2.5" from the end of L1 instead of 1". This gives a small improvement in the distance from the L1 coil that the 4 watt tube will light when using a single 1.5 volt AA battery without a cell phone charger.

YouTube - 1 5V battery no cell phone charger

Xee2
No cellphone charger WOW thats my dream
less parts ... have you tried on a smaller scale of coils
to limit the cost of building one ???????
Will try with a 20 mmdia by 200 mm height paper tube from a toilet roll


This is a great enhancement

cheers

totoalas

[Jiffycoil]

That is really good on 1.5 volts. Does a top-load help any?

[xee2]

small circuit improvement

This is not much of an improvement, but it does help some. I changed the 1K resistor to 200 ohms and the L2 coil diameter from 4.5" to 5" and moved it to about 2.5" from the end of L1 instead of 1". This gives a small improvement in the distance from the L1 coil that the 4 watt tube will light when using a single 1.5 volt AA battery without a cell phone charger.

YouTube - 1 5V battery no cell phone charger

[wetissues]

Wire measurement formulae

Alright for all of you folks who have good hands and an electronic measuring scale, aslo a good side for maths. I have conjured up a formulae to measure how much wire you need, so basically what you do is you measure the weight of the wire you have. Get the tube you want to wind it to and take simple measuerments (it has to be a circular shape) diameter, height and radius (just half the diameter). Also look up the data sheet of the wire you had bought.
Follow the formulae, the key thing is at the top.

diameter (tube) dt 5 gpm= grammes per meter
height (tube) ht 20 g = grammes
diameter (wire) dw 0.3 lwn= legnth wire needed
legnth (wire) lw

lwn=(ht/2dw)(2dt pi)= 105.

33.333 X 31.41=104.719

grammes > wire length (lw) gpm/g= legnth (meters)
500g > 250m 2gpm/500g= 250m

Everything is measured in meters and centimeters. Feel free to comment on my maths (I'm only 13!)

Cheers, WETissues.

[Jiffycoil]

Thanks Jonny,
I got to the point where I felt I was not growing and that spewing electricity in the air was not what Tesla intended for his invention. Working with everyone here feels good and you never know what could come from it. Thank you.

The top loads are chrome metal and they cost $6.79 ea from Save-on-crafts.com I looked around and that's a great price.