Electronic apparatus with audible annunciator and alarm lamp

Details Electronic apparatus with audible annunciator and alarm lamp Electronic apparatus with audible annunciator and alarm lamp

1981-12-10

1984-07-24

Groody, James J.

Communications: electrical

Continuously variable indicating

With meter reading

340327, G08B 522

Patent

active

044620306

ABSTRACT:
A portable electronic apparatus has an oscillator for generating a signal. An audible annunciator has an inductance element for generating an audible annunciating signal in response to a first actuation signal of a first frequency. A light emitting means is turned on and off by counter-electromotive forces developed in the inductance element in response to one of the first actuation signal and a second actuation signal of a second frequency. A frequency divider is coupled to the audible annunciator and to the light emitting means for frequency-dividing the oscillation signal to provide the first and second actuation signals and for selectively generating one of these actuation signals in response to a control signal.

REFERENCES:
patent: 3742481 (1973-06-01), Nickerson
patent: 4194153 (1980-03-01), Masaki et al.
patent: 4249165 (1981-02-01), Mori

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