Microvibration detector using a single piezoelectric element as

Details Microvibration detector using a single piezoelectric element as Microvibration detector using a single piezoelectric element as

1981-11-04

1984-09-04

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

310311, 331 58, 331 65, 340683, G08B 1300

Patent

active

044700407

ABSTRACT:
An alarm device comprises a blocking oscillator circuit composed of a transformer and a transistor and a sound emitter using a piezoelectric effect exhibiting element and interposed between one end of the secondary coil of the transformer and a power source, with the other end of the secondary coil connected to the base of the transistor. When the sound emitter receives a slight vibration, it generates an electromotive force, which is applied to the base of the transistor. Consequently, the blocking oscillation circuit oscillates and causes the sound emitter to issue an alarm.

REFERENCES:
patent: 2524579 (1950-10-01), Taylor
patent: 3665259 (1972-05-01), Brailsford
patent: 3670301 (1972-06-01), Douglas
patent: 3750127 (1973-07-01), Ayers et al.
patent: 3863250 (1975-01-01), McCluskey, Jr.
patent: 4170769 (1979-10-01), Morris et al.

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