Control circuit for electromagnetic transducer

Details Control circuit for electromagnetic transducer Control circuit for electromagnetic transducer

1974-10-24

1976-01-06

Miller, J. D.

Oscillators

Relaxation oscillators

3171555, 331112, 340384E, H01H 4732

Patent

active

039315495

ABSTRACT:
An electronic circuit including a transistor which is biased to conduction is provided to initiate actuation of an electromagnetic transducer. The transducer has first and second coils one of which actuates the sounder. A potential is induced in the other coil and this induced potential is used to cut off the transistor. The next cycle of operation is initiated when the induced potential falls below a predetermined value in response to the reduction of the magnetic flux which, in turn, was the result of the transistor having been cut off.

REFERENCES:
patent: 2843742 (1958-07-01), Cluwen
patent: 2854660 (1958-09-01), Best, Jr. et al.
patent: 2866925 (1958-12-01), Wunderman
patent: 2920259 (1960-01-01), Light
patent: 2977418 (1961-03-01), Haas
patent: 3117265 (1964-01-01), Favre
patent: 3161836 (1964-12-01), Miller
patent: 3440564 (1969-04-01), Kuiper

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