Simulate the traffic light circuit

You would never suspect. Traffic jam at the intersection. He do? Has opened the green light and red light. Or to have people turn off. To resolve the question, we try to create this same circuit.

LM7805

PT100

S82433NX

123NQ100

HEF4069

TAJA224M050RNJ

Operation of the circuit is IC1 (NE555) is the origin frequency pulse-mail rectangle out of pin 3, to define the operating environment of the IC2 (CD4027). The frequency of IC1 is based on the R1, R2, VR1,. VR2. The duration of the brightness of the green light Can be set by adjusting VR1. and if the adjustment will adjust VR2 time in light of the red light.Time signal that is sent to the IC2, which is connected to T-flip flop. The work is going to change the status every edge, rising of the signal pulse from IC1 by the IC2 to the signal output pins 15. But you can not drive the LED current directly, the IC3 (LM555) is used as a buffer circuit. To help drive Prasae the LED.This circuit works well. But there are disadvantages. The yellow light will be lit at all times.


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