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Traffic light circuit with 556 timer?

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hermitengineer:
A ring oscillator doesn't do the traffic light though.  Around the ring you'll find that each LED is a toggle of the one before it.  Since it's a ring with an odd number of inverters, there will be a toggler running down the ring toggling each LED as it goes.  So effectively, you always have about 2 LEDs lit, as seen in the waveforms that were simulated.  You need a ring one-shot instead.  Maybe something like this:


phennessey:
Not true at all. I'm literally staring at a completed circuit that is lighting up exactly the way I want (I just had to change some resistance values to introduce an instability in the cycle.)

hermitengineer:

--- Quote from: phennessey on January 07, 2020, 06:19:22 pm ---Not true at all. I'm literally staring at a completed circuit that is lighting up exactly the way I want (I just had to change some resistance values to introduce an instability in the cycle.)

--- End quote ---
I was wondering if the odd LED hookups were done to eliminate the extra LED in the ring.  Apparently so.  If the LEDs were hooked up in a conventional way (each output to a resistor and LED to ground), then you'd see the typical ring oscillator pattern.

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