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please help with my crossroad traffic light project...

Discussion in 'Homework Help' started by D@rkL0rd, Jun 22, 2014.

  1. alec_t

    alec_t Well-Known Member Most Helpful Member

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    I have never used CW.
    Then try different resistor values! Or use a different simulator :D (LTspice is a free download from Linear Technology).
     
  2. audioguru

    audioguru Well-Known Member Most Helpful Member

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    Maybe the simulator is wrong. Why don't you build the circuit to see?
     
  3. alec_t

    alec_t Well-Known Member Most Helpful Member

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    Try this in your simulator:
    OneSecOsc.gif
     
  4. dave

    Dave New Member

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  5. audioguru

    audioguru Well-Known Member Most Helpful Member

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    Why is the model of your 555 actually a Cmos rail-to-rail 555? The output voltage swing of an ordinary 555 is from about 0.01V to about 3.6V when its supply is 5V and it has no load.

    It will cause your circuit to have an output that has pulses, not a perfect square wave.
     

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