Homemade EMP weapon (Score 2, Interesting)

By way of discussion of a general way to disable electronics; not advocating criminal damage or violation of local spectrum use codes;

Get a shotgun and cartridges (wider the bore*, the better).

1) Saw the barrel right down to within 2 inches or so of the top of the cartridge (may be illegal in your jurisdiction: check!).

EXTREME CAUTION - handling unstable explosives
  - the catridge has, on the inner side of the metal cap, a small amount some unstable explosives (google picarates)
that are designed to go off when the cap is struck. This charge is enough to blow off a finger or maybe a hand.
It's purpose is to set off the [stable] main powder charge. The powder charge could take your head or leg off.
No naked flame, sparks, live wires, hard surfaces, loose tools, children, pets, etc etc etc.

2) pry open the cartridge and ditch the shot (keep the powder charge + wadding).
3) form an empty tube of cardboard, roughly pencil thin, and wrap enough very-thin (e.g. from a small transformer) copper wire
around it so it's wrapped diameter fits snugly back into the part-empty cartridge
NOTE
you need to wrap so that the full thickness is reached before moving onto the next layer - i.e. not all-the-way-up-the-tube
-then-back-to-the-start--for-each-layer
4) get a bar magnet fitting just a bit loosely into your tube
5) place the coil + magnet into the cartridge. the coil should rest about an inch from the top of the wadding.
Glue the coil in place.
6) Inert the bar magnet into the tube and glue the end to the top of the wadding
7) [needs experimentation or a physics person] maybe fix a load resistor (e.g. pencil lead) across the two free ends of the coil wire

Now, when the cartridge is fired in the shotgun,
1) the magnet accelerates through the center of the coil
2) the coil builds a magnetic field
3) as the shockwave of the powder charge successively destroys the coil from one end to the other,
the magnetic field is sucessively compressed into one end of the coil
4) as the final section of the coil is destroyed, an electromagnetic pulse is emitted
5) as no metal barrel is there to interfere, the pulse travels in the general direction of the aim of the gun.

So, when aimed in the general direction of a mosquito alarm, within say a hundred feet (?), it ought to fry it's circuits.
Perhaps circuits of a bunch of other stuff in the general direction.
Range is unknown; will be fairly loud (wear ear protectors).

I haven't tried this myself... Caveat experimentor ..

* bore (not boar[=pig]) is measure of inner width of barrel. works like this: "12-bore" = width of sphere of 1/12th a pound of lead ; "18-bore" = width of sphere of 1/18th a pound of lead - so smaller bore is bigger. mmkay? 'Guage' probably same thing in USA .. somebody check, quick ..