Photo monitoring apparatus with visual/audio alarm

Details Photo monitoring apparatus with visual/audio alarm Photo monitoring apparatus with visual/audio alarm

1995-02-03

1996-06-25

Swarthout, Brent A.

Communications: electrical

Condition responsive indicating system

Specific condition

340691, 356221, G08B 1712

Patent

active

055304320

ABSTRACT:
A photo monitoring apparatus including a photoresistor, a series of shunt resistors, and a comparator IC, wherein the comparator IC provides an output signal to a LED and a diaphragm speaker, when the voltage from the shunt resistors drops below a pre-set reference voltage, causing the LED to give light and the diaphragm speaker to produce a warning sound. The shell of the photo monitoring apparatus is installed with a digital time display controlled by a time circuit to indicate time.

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patent: 3652168 (1972-03-01), Yanagi
patent: 3709615 (1973-01-01), Blakeslee
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patent: 3786460 (1974-01-01), Kalenback
patent: 3878496 (1975-04-01), Erickson
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patent: 4155077 (1979-05-01), Rohan
patent: 4242670 (1980-12-01), Smith
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patent: 4400087 (1983-08-01), Nakayama
patent: 4538218 (1985-08-01), Watson
patent: 4637721 (1987-01-01), Naruse
patent: 5281952 (1994-01-01), Dragon

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