Digital dimming and flashing circuit for locomotive ditch...

Details Digital dimming and flashing circuit for locomotive ditch... Digital dimming and flashing circuit for locomotive ditch...

H - Electricity

05

B

H05B 37/02 (2006.01) B60Q 1/54 (2006.01) B61L 15/00 (2006.01)

Patent

CA 2125833

DIGITAL DIMMING AND FLASHING CIRCUIT FOR LOCOMOTIVE DITCH LIGHTS ABSTRACT OF THE DISCLOSURE A light is dimmed by pulsing it at a selected duty cycle. By pulsing, the light can be dimmed without being turned off completely which reduces wear on the filament. The circuit is designed for flashing a pair of ditch lights on a railroad locomotive. The lights are alternately illuminated at full voltage and dimmed by pulsing. The flashing sequence can be activated when the locomotive is travelling below a selected speed or when the horn is sounded. The duration of the flashing sequence is controlled by a timer. The pulsing circuit can be used to effectively reduce a voltage without voltage dropping resistors.

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