Energizing means for electronic warning apparatus

Details Energizing means for electronic warning apparatus Energizing means for electronic warning apparatus

1989-05-08

1990-07-31

Crosland, Donnie L.

Communications: electrical

Audible indication

Diaphragm

340390, 340401, 340404, 116137R, 116142R, 181144, 381 89, G08B 300, G01K 900

Patent

active

049453343

ABSTRACT:
According to the invention, a high-powered community alerting and warning device comprising a number of electromagnetic drivers is energized for tone generation by means of a rotary alternator that produces, when driven at a predetermined rotational speed, a sine-wave a.c. in the 400-800 Hz range. The alternator output is applied directly to the drivers, eliminating costly amplifier modules and energizing the drivers for better efficiency and reliability than an amplifier system. The alternator can be the output of a rotary frequency converter, or it can be driven by an engine or a separate electric motor.

REFERENCES:
patent: 2819460 (1958-01-01), Jacobs
patent: 3517390 (1970-06-01), Whitehead
patent: 4241334 (1980-12-01), Shintaky
patent: 4344504 (1982-08-01), Howze
patent: 4796009 (1989-01-01), Biersach

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