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SMART_TURN_SIGNAL_FOR_AUTOS_AND_MOTORCYCLES

2016-09-01 02:32  
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SMART_TURN_SIGNAL_FOR_AUTOS_AND_MOTORCYCLES
Momentarily pressing S1 starts the left on-time timer and produces a positive output at pin 3 of U1. Power for the on/off signal timer, U3, is supplied through D1.Also, a positive bias is supplied from U1's output to the base of Q3, turning it on and turning Q4 off. Unclamped Q1 turns the left turn-signal lamp on and off at that same low-frequency rate. Because U2 is not activated, its output at pin 3 is low, keeping Q5 off. With Q5 turned off, Q6 is on, clamping the gate of Q2 to ground and keeping it from responding and supplying an output for the right turn-signal lamp. The left turn signal continues to operate until the UI timer circuit times out; the right turn signal operates in a similar manner, with U2 setting its operating time.Potentiometer R10 sets the running time for the left turn signal and R11 sets that for the right turn signal.