Annunciator circuit for elevator systems

Details Annunciator circuit for elevator systems Annunciator circuit for elevator systems

1986-05-20

1987-08-04

Levy, Stewart J.

Communications: electrical

Audible indication

Ultrasonic pest control

G08B 300

Patent

active

046849270

ABSTRACT:
A highly reliable annunciator circuit which is immune from spurious signals generated in an elevator environment is provided. The circuit employs an input condition verification network which performs in conjunction with low true logic two-bit inputs by carrying out switching only when those inputs fall below a preset control value, highly enhanced performance is achieved. Volume control over the piezoelectric output developing a chime or gong sound is achieved through a variable impedance control which is adjustable on site.

REFERENCES:
patent: 4193060 (1980-03-01), Slavin et al.
patent: 4257036 (1981-03-01), Slavin et al.
patent: 4558305 (1985-12-01), Black et al.

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