🚀 go-pugleaf

In article <4149@utai.UUCP> cda@utai.UUCP (processor) writes:
>    I'd like to build a walkman jamming device for
>use on the train.  One for walkman radios would be
>easy, but of little use.  Any ideas whether a
>short-range tape-recorder jammer (i.e. noise
>generator) is feasible?  Any suggestions for
>such a circuit are welcome.

Sounds like a few surplus SDI giga-joule capacitors and a few loops of
wire will do the trick. Problem is you and the jammer will hardly fit
in the subway car by yourselves. You won't have to worry about some
urchin coming along blasting a tape deck in your ear. Oh yes, you will
have to watch out for pace-makers too. Not really desirable to shut
grandpa down in the attempt to quiet a tapedeck.

Now for a fun kinetic energy weapon design. I built a few of them back
in highschool. Take all the large 200v capacitors you can find and tie
them all together in parallel. The more, the better, at least a few
100 uF's are needed to do anything.  Tv power supplies are a good
source for these. Add a charging circuit (a bridge from an isoloted
120 vac with a several watt ceramic 100ohm series resistor is cool).
Find a plastic tube, 6" long with a 1/4" bore.  Mount a coil of
several hundred turns on the plastic tube. drill a small hole ~1/2"
below the coil, and insert a small plastic piece to act as a support.
Leave plenty of room for air to rush around this support. Now drop a
ferrous object down the tube, and energize the coil. I used a spdt
push-button switch which would alternately charge the caps via the
resistor, and discharge them via the coil.

If you have a strobe you can probably adjust the timing such that the
field collapses just as the launched object passes the coil.

Now if you build this: PLEASE BE CAREFUL, 200v can KILL YOU. The
launcher on the other hand is relatively safe, it probably won't do
more than give you a bruise, unless you are looking into the barrel as
it fires, etc. (At least mine never had much umph. Even though I
experimented with various L/C/wire-guage/coil-to-object-spacing
combinations.)

Oh, I should also mention. The caps aren't really designed for this
sort of abuse (no kidding wolfgang!). The plates will fatigue from the
combined forces induced by a rapidly dropping e-field and a quickly
rising m-field.  You will hear a distict <click> as the plates move
during "launch".  What gets really exciting is when one of them
finally shorts out. Hint: Don't leave out the charging resistor.  You
can also add a 1-amp slow blow fuse. Be warned.
Wolfgang Rupprecht	UUCP: mit-eddie!mgm.mit.edu!wolfgang
				(or) mirror!mit-mgm!wolfgang
			ARPA: wolfgang@mgm.mit.edu (IP addr 18.82.0.114)