Solid-state whistle and horn activation system for model railroads
First Claim
1. Apparatus for actuating a sounding device for a model railroad engine powered by an AC voltage impressed across two rails comprising a solid state circuit having:
- means for receiving a first signal indicative of said AC voltage impressed across said two rails, said AC voltage being present to power said engine and said sounding device;
means for generating a second signal indicative of a DC biased voltage superimposed on the two rails comprising a shunt circuit coupled to the two rails which shunts the AC voltage impressed across the two rails; and
means supplied by said AC voltage for powering said sounding device responsive to times when said second signal is generated.
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Accused Products
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.
21 Citations
6 Claims
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1. Apparatus for actuating a sounding device for a model railroad engine powered by an AC voltage impressed across two rails comprising a solid state circuit having:
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means for receiving a first signal indicative of said AC voltage impressed across said two rails, said AC voltage being present to power said engine and said sounding device; means for generating a second signal indicative of a DC biased voltage superimposed on the two rails comprising a shunt circuit coupled to the two rails which shunts the AC voltage impressed across the two rails; and means supplied by said AC voltage for powering said sounding device responsive to times when said second signal is generated. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification