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EMP BOX - TEST RESULTS - CALCULATOR AND LED CONNECTED TO A COIL...

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Slava

Wed Nov 18 2015, 02:30AM

Registered Member #518 Joined: Tue Feb 13 2007, 05:20AM
Location: New York
Posts: 168

Signification wrote ...

"Electrocute" usually implies 'killed'

You can see a beautiful picture of the resonant frequency of the oscillation of any particular LC by energizing or DE-energizing the cap through the coil while hooked to an o'scope. As the amplitude drops, the frequency (resonant) remains constant on the scope and you can simply read the LC frequency or period.

BTW...an interesting experiment: Charge a disposable camera until the orange "ready" Ne lamp comes on, then zap it with your device--I bet it fires the strobe! May even work on a digital camera--if you have one to trash. My small laser flashlamp trigger fires them at a few inches.

You know this device would surely be illegal (if not already) if boosted!

I read that it is ok to own one, but not to sell it or carry it around.

001

GrantX

Wed Nov 18 2015, 04:13PM

Registered Member #4074 Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335

Signification wrote ...

...gonna change his data quickly over time too...

I think what Signification meant is that the spark-gap will degrade over time, and you will see a noticeable change in performance. The screw electrodes will slowly be eroded and soot will gather in the gap (along with the plastic being hit by UV). I imagine that over time the threshold voltage will drop and the quench time will increase, damaging performance.

A long time ago I lashed together something similar as a wireless power demo (LEDs with a coil as the receiver). I first used a few gas discharge tubes in series (surge arresters, not meant for high duty cycle stuff), which degraded very rapidly, even at very low powers. After that I tried a spark gap made from two brass bolts on a phenolic board, which was good enough for my purposes. The spark was quite close to the board, so it required periodic cleaning to avoid carbon tracks from forming and eventually became discolored from the UV/heat. However I never noticed much degradation in performance, so you might see some good results by using a slightly larger brass/copper gap with some ventilation.

Slava

Wed Nov 18 2015, 04:19PM

Registered Member #518 Joined: Tue Feb 13 2007, 05:20AM
Location: New York
Posts: 168

EMP version 4 ....

I will use this flashlight as a chassis...

Sulaiman

Wed Nov 18 2015, 08:11PM

Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141

regarding the plastic tubing spark gap, it will be interesting to see which is first
melting due to heat, disintegrating due to ozone, surface tracking then carbonisation then fire .... (add your guess here)

I'm sure that it will work, for a while ;)

P.S. I bought a couple of 4-cells-in-series battery holders for some of my many 18650 lithium cells, ex-laptop battery packs.
After a little tweaking, very useful, 1A=good, 2A = a little warm but no problem, 5A peaks ok. (14,28,70 Watts per pack)
and voltage usable by most '12 Vdc' circuits.
I also have some 're-wrapped' & 're-specified' (x2) mAh, very few failures and good value even though the mAh is 'optimistic' ;)
and I do not feel as guilty by not using lead-acid batteries.

Slava

Wed Nov 18 2015, 08:53PM

Registered Member #518 Joined: Tue Feb 13 2007, 05:20AM
Location: New York
Posts: 168

When i get more power supplies i will do a stress test on a spark gap

edit >>>

You guys were right... I ran the spark gap for 4 minutes and it started to melt the plastic sleeve. The gap did not fail though. Even with a melted sleeve the gap distance stayed the same and there was no fire.

001

Slava

Sat Nov 21 2015, 08:19PM

Registered Member #518 Joined: Tue Feb 13 2007, 05:20AM
Location: New York
Posts: 168

Video:

2Spoons

Sun Nov 22 2015, 10:37PM

Registered Member #2939 Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615

why not use an ordinary automotive sparkplug for your spark gap?

Slava

Sun Nov 22 2015, 10:40PM

Registered Member #518 Joined: Tue Feb 13 2007, 05:20AM
Location: New York
Posts: 168

2Spoons wrote ...

why not use an ordinary automotive sparkplug for your spark gap?

Some of them have internal resistors... I don't know which to get, they are also a bit large... Can you regap it to 3mm ?

GrantX

Mon Nov 23 2015, 04:34AM

Registered Member #4074 Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335

Where I live, you can buy small sparkplugs designed for lawnmowers from almost every petrol station and hardware store. They are a bit smaller than car sparkplugs, and have zero internal resistance. The gap distance is easily adjustable by lifting the electrode up with a screwdriver. I imagine they will withstand a lot more power for longer when compared to the plastic tubing gap.

Signification

Sun Dec 27 2015, 01:22PM

Registered Member #54278 Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367

Is there a simple way of a way adding a tiny antenna to the EMP generator for a kind of weak directional beam (I think it would be similar to those ion-gun gadgets, but I want something much simpler with only a range of a few inches). I would like to trigger a triggered spark gap without an actual physical connection to the center trigger terminal.

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