>Ebay has lots of them. Search "police siren". The
>best ones are 100 watt Motorola drivers and horn.

Actually the best ones are the pre-electronic ones which were the air raid
type driven by a car starter motor. The N.Z. police used these when I was a
boy, and I reckon they would beat any electronic one for volume. They used
to use a head lamp foot operated dip switch to turn them on and off. I heard
a funny story of a traffic officer who used the siren in the course of
stopping a vehicle in a remote spot, only to find that he could not turn the
siren off as the switch had gone faulty (not really surprising at those
currents). By the time he had issued the ticket, and got back to the vehicle
the siren had run the battery down so he could not start the car, or call on
the radio. I suspect that the siren drew enough current to flatten the
battery even with the car idling - this was before alternators, and I
suspect even one of those would not have held the battery up.

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