Solid-state whistle and horn activation system for model railroa

Details Solid-state whistle and horn activation system for model railroa Solid-state whistle and horn activation system for model railroa

1985-12-18

1988-05-31

Orsino, Joseph A.

Railways

Car-carried propulsion system

Electric

340384E, B60L 100

Patent

active

047473517

ABSTRACT:
Apparatus for actuating a sounding device for model railroad engines powered by an alternating-current voltage impressed across two rails, which apparatus is completely solid state in nature. The system includes input and output transistors which are normally non-conducting together with means for producing a direct-current bias voltage for turning ON the input transistor when a direct-current bias voltage is superimposed on the alternating-current voltage impressed across the two rails. The input and output transistors are interconnected such that when the input transistor conducts so also does the output transistor to thereby power the sounding device.

REFERENCES:
patent: 2155343 (1939-04-01), Bonanno
patent: 2172468 (1939-09-01), Giaimo
patent: 2990964 (1961-07-01), Timmer
patent: 3341842 (1967-09-01), Breguet
patent: 3705287 (1972-12-01), Stern et al.
patent: 3893107 (1975-07-01), Schedler

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