Turn signal non-return indicator

摘要

There is disclosed a non-return indicator for a turn signal in a road vehicle which may be installed with at most three or four electrical connections; it includes a housing with four lead wires extending to a vehicle ground, a plus 12 volt wire, a right turn circuit wire tap, and a left turn circuit wire tap. The indicator includes a binary counter IC for registering a count of 64, 128, or 256; the count setting may be selectable; a separate time delay IC to reset the counter may be provided. A pair of back to back diodes in the right turn and left turn-connected conductors keep them isolated while the counter receives a count for either right turn or left turn signal flashes; upon reaching the predetermined count the counter signals a gate circuit to provide either a steady or intermittent current to an indicator buzzer, beeper or lamp. Alternatively a storage capacitor will permit the counter or other IC's to be powered only from the turn circuits.