Acoustical switch

Details Acoustical switch Acoustical switch

1974-05-31

1976-07-20

Wilbur, Maynard R.

Communications: electrical

Selective

Having electron beam device

340171R, 340 16C, 340310R, 353122, H04B 1100

Patent

active

039709876

ABSTRACT:
An acoustical switch is actuated from a remote location by a sound generator such as an ultrasonic whistle. The switch includes a special tuned signal receiver coupled with an amplifier having a frequency selective feedback network. The output of the amplifier is an a.c. signal which is applied to a bistable circuit which, in one state, energizes a relay to turn on an appliance connected to the switch and, in its other state, turns the appliance off.

REFERENCES:
patent: 3199070 (1965-08-01), Baier, Jr.
patent: 3423725 (1969-01-01), Harwood
patent: 3471846 (1969-10-01), Cotter
patent: 3548116 (1970-12-01), Schafft
patent: 3590271 (1971-06-01), Peters
patent: 3675226 (1972-07-01), Long

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