thebugger

modified 9 years ago

EMP Generator

1654

1d 02:34:25

I got idea last night while i was contemplating how the computers are gonna take over the world one day. Then it hit me. Why use extremely complicated computer viruses to wipe them out, when we can just fry them with an Electromagnetic Pulse. This works in the same manner like old cameras, when they ignite the flash. A booster circuit steps up the voltage to around 200-300V, charging a large capacitor. This capacitor is then quickly discharged through the flash tube. So if we substitute the flash tube with a coil, the result is a highly energetic Electromagnetic wave pulsing back and Forth between the capacitor and the coil. The larger the capacitor value, the more intense the burst. I've given 100nF here, but in reality it should be no less than 10uF. The higher the capacitance the longer the duration of the pulse and its range, and its intensity. I suggest everything above 47uF. But if you go with a really large value like 470uF i suggest you add a limiting resistor to limit the initial surge of current to the capacitor, because it may damage the booster circuit. The coil is 10-15 turns of somewhat thick wire over a 50mm diameter with an average height of 10-20mm. When the capacitor is charged (for 470uF and 10k limiting resistor that means around 25s till full charge), you press tbe switch and it starts discharging through the coil. Any turned on electronic device in the immediate vicinity will instantaneously be damaged. 

published 9 years ago

hurz

9 years ago

Use an old flash camera and destroy RF ID Tags

hurz

9 years ago

Look here https://events.ccc.de/congress/2005/static/r/f/i/RFID-Zapper(EN)_77f3.html

thebugger

9 years ago

Yep I know. But the LC circuit should be on resonance with the encoding frequency of the tag, which is either around 13MHz or a few KHz. And yes the circuit can easily be based on a flash camera. Ive already written that in the description

hurz

9 years ago

A good sharp impuls does include all ferquencies and cause any resonance

hurz

9 years ago

Think spectral buggzy

thebugger

9 years ago

Yeah but you disable the pulse by flicking the switch and leave only the tank circuit, which resonates only at a specific frequency.

thebugger

9 years ago

It's like charging a capacitor and then discharging it through a coil. It's a high Q LC circuit.

hurz

9 years ago

Resonance can be seen as a series of impulses on a base harmonic and it upper additional harmonics which cause ringing. Anyway by a realistic configuration there is not much resonance ongoing (dont forget all resistance) it will be more a single puls in which all energy and all its harmonics is concentrated. All followup ringing pulses are much much lower and you can forget them for any destructive use. 470uF 100mOhm ESR and 5uH ESR in 100mOhm included check that at 400V

hurz

9 years ago

http://everycircuit.com/circuit/6509382334939136

hurz

9 years ago

10 to 15 turns is not more then 5uH and dont do that on a diameter of 1m. The energy must be magnetically concentrated so on a small diameter

thebugger

9 years ago

15 turns is 17uH but otherwise yeah

thebugger

9 years ago

But i think 100mOhm is too much. Maybe more like 30-50mOhm. But still i get what you mean

alan1

9 years ago

Is this voltage increase continuously? Doesn't it decrease?

thebugger

9 years ago

It's in a pulse manner. It decreaaes of course.

hurz

9 years ago

15turns air coil with diameter 5mm are e.g. also 150nH. So what do you expect for diameter, yeaaah?

thebugger

9 years ago

Where did you see 5mm it's 50mm

thebugger

9 years ago

The larger the coil and the cap the bigger the EMP, but you know that already

lmccoig

9 years ago

Humans are robots to serve now. Unless computer is happy, nothing works. Many need rescued from computers now.

thebugger

9 years ago

I just tried it with a 220uF cap and a 33uH coil at 250V and it doesn't have the strength to damage any device i throw at him. The capacitor acts as if it's short circuited through the coil. Anyway i guess that's due to the dampened oscillations. They simply don't have the same strength as a pulsed train EMP.

hurz

9 years ago

33uH cant give you a quick sharp rise time for ultra wide band magnetic field in frequency. You must lower the inductivity and keep the resistance extremely low. Cap with low ESR and thick coil wiring in some 100nH

hurz

9 years ago

It must be like a short for the cap to bring all energy as quick as possible into a magnetic field. The cap must be constructed to allow shorts and the coil must be low in resistance.

thebugger

9 years ago

Yeah and I've been using an old russian cap, and they tend to increse their ESR, and lose capacitance over time. I'll try with a 47uF (high grade) cap and a smaller coil, of let's say 10-15uH

thebugger

9 years ago

I also think this capacitor which I've been using is current leaking. It doesn't seem to be able to charge completely. The booster should be able to provide up to 350V on open circuit, which the capacitor is, when charged and I'm getting no more than 260V. Will look into it.

thebugger

9 years ago

100nH? Isn't that awfully low? I believe at least 10uH is needed, otherwise it's an almost complete short circuit

WTFCircuit

9 years ago

Can a spark gap be used instead of the switch? Or has it a to much high resistance?

thebugger

9 years ago

Yes the resistance is close extremely high (several Mohms) and the point here is to keep it to several mohms. A spark gap is good when you want to excite oscillations in a given LC tank circuit, without having to tune the ,,exciter'' to the specific frequency. That's because sparks contain a very wide band of frequencies, one of which will be in resonance with the LC circuit. A good example of this is the Schumann Resonance wherw the Earth's atmosphere is the cavity, the waveguide if you will, in which the wave of 7.83Hz travels, and natural phenomena like lightnings, constantly excite this oscillations, keeping them from fading.

thebugger

9 years ago

Another good example is the original tesla coils, even before vacuum tubes were invented he used spark gaps to excite high frequency oscillations in a tuned LC circuit, which was then stepped up to a few kV

WTFCircuit

9 years ago

I had the idea indeed from the spark gap tesla coil because I'm currentely making a little one.

thebugger

9 years ago

Nowadays we have semiconductors, you can skip the spark gap, go straight for the blocking oscillator or something similar

WTFCircuit

9 years ago

I choose that because it is powerfu, costless, noisy and a lot easyer to make ;-). Anyway I will surely built a solid state one, but now I don't have either enough time and money. For now I will keep my mini slayer exciter and the tiny spark gap one (not very tiny but for me, but very tiny compared to other ones on the internet :-p )

thebugger

9 years ago

Sure, why not. But it's cheaper to make a solid state tesla coil. Excluding all the coils of the discharge corona you need an extra transformer to step up the mains to a level where it can gap between two poles, whereas a single transistor can get you the same result. All of that said, try first the old fashioned way, as you are, and if successful, you can further minimise it with a solid state booster

WTFCircuit

9 years ago

I'm actually using a flyback with a zvs driver, which is way less espensive than a neon sigh transformer. Other high voltage transformers aren't good enought. Also a well made sstc needs at least 2 high power 400V 30A mosfets or, better, igbts because them has to switch 325Vdc from the mains. Then the gdt (gate driver transformer) that has to be extremely well made and not all the cores are good for that, controlled by other two mosfet and, in general, a pll oscillator, with working feedback antenna and transformers, and so on. This is more complicated that it seems, isn't it? XD

thebugger

9 years ago

Microwave oven transformers should do the trick if you have a spare one

WTFCircuit

9 years ago

At least three of them. One of them has a to low voltage and to much current, it can damage the mmc bank and the spark gap

thebugger

9 years ago

I think 2 of them will also suffice. As far as I know, you need one to step up the mains to a level which can create a spark. 10kV at half a cm spark gap will do. The second part is the tuned primary of the second transformer. You can tune it to any frequency, 100KHz should do the trick. Now the third part (the secondary) is more tricky and I'm not entirely sure how to do it. I know you need it with a lot more turns than the primary and you somehow connect the torus, but I'm not entirely sure how

WTFCircuit

9 years ago

I have already made the secondary: 17cm high 4cm diameter 850turns with 0.2mm wire. It has a resonance frequency of 1.22MHz, so the primary has to oscillate around that frequency (+-10% someone says). The mmc bank(multi mini capacitor), AKA resonant tank capacitor, of 2.44nF so the primary has to be around 7uH tunable obviously.

WTFCircuit

9 years ago

I'm quite prepeared on that, am I? XD

thebugger

9 years ago

Yep you've done you're homework. I've never had the nerves to wind coils. I get frustrated at the 10th turn and throw everything :D

WTFCircuit

9 years ago

And this is my fourth coil ;-) I'm luky I'm very patient and precice with those sort og things XD

WTFCircuit

9 years ago

Now I have to understand why in the zvs driver the voltage on the drains of the mosfets is the supply voltage moltiplied by π

thebugger

9 years ago

Probably something to do with resonance. П is often involved in oscillation equations because a sinewave can basically be viewed as a circle (when you exclude time from the equation) and the circle is divided basically in four portions П, 2П, П/2 and 3П/2. From what I've learned, there is always a П in sinewave equations.

WTFCircuit

9 years ago

Surely is the resonance that does that

jawadahmed

8 years ago

well n gud

yeahbuddy

5 years ago

The bugger ... when u say add a limiter resistor do u mean betwèen cap and ground? And what value resistor if using 470

yeahbuddy

5 years ago

Disregard last part 10k I see

yeahbuddy

5 years ago

What is the range ? Couple meters ?

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