Alarm sounder for A.C. operated solid state devices

Details Alarm sounder for A.C. operated solid state devices Alarm sounder for A.C. operated solid state devices

1977-06-03

1979-04-03

Pitts, Harold I.

Communications: electrical

Audible indication

Percussion-type sound producer

340402, 340384E, G08B 300

Patent

active

041480180

ABSTRACT:
An alarm sounder for use with solid state integrated clock circuits employs an amplifying transistor controlled by the clock alarm output signal that contains an A.C. component to control the current through a coil, the core laminations of which magnetically actuate a metal reed that is audibly vibrated by utilizing a spring against the core and/or an adjacent member at the frequency of the A.C. component.

REFERENCES:
patent: 2757365 (1956-07-01), Perez
patent: 3888075 (1975-06-01), Wecker

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