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Traffic light alternately flashing circuit diagram

2017-02-03 04:23  
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Traffic light alternately flashing circuit diagram
National's LM3909 is connected into relaxation oscillator, which allows two diodes with red light green light alternately flashing. Power supply is 12V, and the repetition rate is about 2.5HZ, then the anode or cathode of green light-emitting diode must be connected to pin 5, and the connection is shown in the bottom, this is because the pulse voltage of the pin is higher, time is shorter. LED models is not limited.