Device for generating a synchronous sound referring to a model r

Details Device for generating a synchronous sound referring to a model r Device for generating a synchronous sound referring to a model r

1979-08-07

1981-05-12

Shay, F. Barry

A63H 3326

Patent

active

042663687

ABSTRACT:
A model railway engine carries a loudspeaker which is connected via the running rails to an electronic circuit which drives the loudspeaker to produce sounds simulating a real engine. To achieve synchronization of the sounds with the rotation of the engine wheels, a light diode on the engine emits light which is reflected off the inside of a wheel of the engine onto a phototransistor. The reflecting surface is marked to produce the desired pattern of light pulses at the phototransistor, which is connected to the electronic circuit.

REFERENCES:
patent: 2882834 (1959-04-01), Smith
patent: 3061973 (1962-11-01), Oberdorf
patent: 3425156 (1969-02-01), Field
patent: 4160339 (1979-07-01), Dankman et al.

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