Variable amplitude timed alarm system

Details Variable amplitude timed alarm system Variable amplitude timed alarm system

1973-12-10

1976-01-06

Caldwell, John W.

Communications: electrical

Audible indication

Ultrasonic pest control

325396, 325411, 307251, 3403091, 340328, G08B 300

Patent

active

039316211

ABSTRACT:
A timed alarm system having an audio signal source coupled to a sound reproducing system by means of a field effect transistor which yields increasing output as its control electrode is biased by a capacitive network thus producing an alarm signal of gradually increasing amplitude. Apparatus for delayed alarm and drowse capabilities is also described.

REFERENCES:
patent: 2930000 (1960-03-01), Seller
patent: 3356949 (1967-12-01), Jones, Jr.
patent: 3544901 (1970-12-01), Wood
patent: 3559072 (1971-01-01), Davidson
patent: 3825836 (1974-07-01), Pyles

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