> > Wire a 6V relay so that the normally closed contacts are in series
> > with the relay. Now add a shielded cable of about a meter, and connect
> > the shield to the battery side of the contacts, and the center
> > conductor to the coil side through a good capacitor that can take some
> > current, 0.1uF or thereabouts, and on the other end,
> > fabricate a small coil of 10-30 turns.   Add a pushbutton in series
> > with the battery, and you have "Angry Bees".
>=20
> Te he.  I've found it stops being fun when the contacts weld.  ;-)
>=20
> Although it was 30 years ago.  Might be better relays now.

When I worked for a government laboratory in NZ, the guys had a little ligh=
t box they used for taping out PCB masters 9back in the days of actually us=
ing tape). This had two or three fluorescent tubes in it, and a 'standard' =
immunity test was to flick the off/on switch a few times around your new pr=
oject and see how immune it was.

I remember one of the guys using it when a new interface was being develope=
d for an interface board to go in the PDP11 machine being used on a project=
.. The result was that many interrupts to the processor they had to kill the=
 machine. I got the job of sorting out how to filter the noise.



--=20
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