Sound actuator

Details Sound actuator Sound actuator

1979-10-29

1981-10-06

Pitts, Harold I.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, G08B 300

Patent

active

042938511

ABSTRACT:
A horn and actuator circuit particularly useful in connection with selective actuation of a horn located onboard a model railroad train as the train transverses a selected section of track wherein the horn is selectively actuated and deactuated by a magnetic field of selected polarity located at the track and where the horn assembly includes a magnetic field detector to detect the magnetic polarity most recently received to actuate and deactuate the horn means. The horn means can include at least one oscillator adapted to generate a square wave pulse of selected frequency and can include one or more additional horns to generate square wave pulses of a second frequency as well as arrangements where the output frequency and intensity of an oscillator is modified to provide a sound of variable frequencies and intensity simulating a steam whistle.

REFERENCES:
patent: 3284796 (1966-11-01), Borsattino
patent: 3341842 (1967-09-01), Bregurt
patent: 3375376 (1968-03-01), Kermodie
patent: 4065767 (1977-12-01), Neuhof
patent: 4138709 (1979-02-01), Colwill

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