Alarming apparatus

Details Alarming apparatus Alarming apparatus

1981-11-24

1984-11-13

Brigance, Gerald L.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, G08B 300

Patent

active

044828888

ABSTRACT:
An alarming apparatus having a sound volume level setting circuit for setting the volume level of the sound produced from a sound generating circuit to one of a plurality of different sound volume levels. A modulating circuit varies the frequency, duty ratio (pulse duration) or amplitude of the signal transmitted from the oscillating circuit. The sound generating circuit produces sound having one of a plurality of different volume levels according to the signal transmitted from said modulating circuit.

REFERENCES:
patent: 4001816 (1977-01-01), Yamada et al.
patent: 4110750 (1978-08-01), Heyning et al.
patent: 4187670 (1980-02-01), Okano
patent: 4206448 (1980-06-01), Davis
patent: 4232305 (1980-11-01), Lelaidier et al.

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