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Author Topic: Building an EMP Generator  (Read 32401 times)
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solutions
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« Reply #25 on: November 25, 2012, 06:32:18 18:32 »

http://www.tgdaily.com/security-brief/67629-pentagon-eyes-advanced-emp-grenades
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optikon
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« Reply #26 on: November 25, 2012, 07:56:11 19:56 »

 Granted, the discharge was only 70 - 120ns wide and at ~ 3 kA, its not hard to make an EMP
~ 8 Joules of energy, LOL
What about X-rays?
« Last Edit: November 25, 2012, 08:00:06 20:00 by optikon » Logged

I can explain this to you. I can't comprehend it for you.
solutions
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« Reply #27 on: November 26, 2012, 05:37:48 05:37 »

Xrays won't work well against hardened government targets.

Like Congressmen:



 Tongue
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metal
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« Reply #28 on: November 26, 2012, 09:50:04 09:50 »

simpsons
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bbarney
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Uhm? where did pickit put my mute button


« Reply #29 on: November 26, 2012, 05:24:18 17:24 »

Metal didn't we just mute that guy  Grin
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WhiteKnight
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« Reply #30 on: February 11, 2013, 10:01:16 10:01 »

A video on the subject.
http://www.boeing.com:80/Features/2012/10/bds_champ_10_22_12.html
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thunderer
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« Reply #31 on: February 15, 2013, 08:34:49 20:34 »

Why build one, when it is so inexpensive to buy one: http://electronicdesign.com/blog/what-devil-emp-and-should-you-be-afraid Tongue
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Interested and hopefully helpful in: DC brushed motor control (mainly R/C - PPM/PWM), analog audio, PIC (mikrobasic PRO). Feel free to ask, and if I can, I will help. But only on forum topics, any started private conversation will continue in a public topic.
solutions
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« Reply #32 on: February 15, 2013, 09:01:33 21:01 »

"You can actually buy an off-the-shelf 1.8 gigawatt EMP generator for $14,000 for “research” purposes."

Divide by 100 and we'll talk "cheap"
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solutions
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« Reply #33 on: February 16, 2013, 12:16:08 12:16 »

Depends what you want to do with it. A focused microwave beam doesn't need 1.8GW. A microwave oven is a bit over a kilowatt and sparks fly in it - I'm guessing the same beam cross section (say 30cm) at a kW (or a few) should be peachy.

I think you could hack one out of microwave oven, or two, or three. and satellite dish parts for less than $1000
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zac
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« Reply #34 on: January 08, 2014, 12:39:30 00:39 »

Someone apparently has made an inexpensive pocket sized version:

http://www.cbc.ca/news/canada/manitoba/new-5-device-easily-unlocks-car-doors-for-thieves-in-winnipeg-1.2288826
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solutions
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« Reply #35 on: January 08, 2014, 03:51:49 15:51 »

Is it EMP or is it merely a keycode sequence generator?
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CocaCola
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« Reply #36 on: January 08, 2014, 06:03:32 18:03 »

Is it EMP or is it merely a keycode sequence generator?

It was/is a mini EMP that was being imported for chump change from a few lucrative Asian electronics sites...  I tracked the device down when the initial news broke (on news agency had a screen shot that although edited out still contained enough for me to track it down) but that was months ago now...  It's really a crude exploit as it's far from reliable pretty much a hit and miss and get lucky exploit...
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zac
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« Reply #37 on: January 08, 2014, 06:09:49 18:09 »

I saw these on dhgate, but none were in the $5 range:

http://www.dhgate.com/wholesale/emp/s118.html

There are also quite a few models available on ebay, but none near $5:

http://www.ebay.com/itm/REMOTE-ELECTRO-MAGNETIC-PULSE-EMP-GENERATOR-MULTIFREQUENCY-CHINESE-CHINA-/181159490392?pt=LH_DefaultDomain_0&hash=item2a2df27358

Note the number sold:

http://www.ebay.com/itm/REMOTE-ELECTRO-MAGNETIC-PULSE-EMP-GENERATOR-MULTIFREQUENCY-CHINESE-CHINA-/181159490392?pt=LH_DefaultDomain_0&hash=item2a2df27358
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solutions
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« Reply #38 on: January 09, 2014, 04:46:50 04:46 »

Pretty robust spiral antennas used by those master craftsmen....

Would be neat if someone reverse engineered these to see what makes them tick
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LithiumOverdosE
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« Reply #39 on: January 09, 2014, 05:47:19 05:47 »

Perhaps they use some kind of small pulse forming network or even just generator of strong transients. My guess is that a wideband signal could be generated with sudden capacitive discharge or something similar.

Take a look at this powerful wideband generator that was historically used for medical purposes. http://youtu.be/BkpryjXYtZg The device seems to use a series of split ring resonators as active/passive radiating elements and the action appears to be primarily capacitive in nature but perhaps the same general idea could be used to generate. Let's say some kind of SMPS is used to charge capacitor to as high voltage as possible and then everything gets dumped into a very low inductance primary. Secondary would then generate sudden EM field transient. At least some of that will be radiated into its surroundings.

Its just an idea but perhaps some of it could be used. IIRC I saw that there were some IEEE papers available on the small pulse forming networks but I never investigated it.
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zac
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« Reply #40 on: January 09, 2014, 09:30:33 09:30 »

The photos show stacks of rechargeable lithium cells in them so they apparently use a high voltage (54V?) supply. 
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