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How do I draw a truth table for this!???!


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My teacher said I should make a truth table for this (Not as an assignment) but I have no idea how to make a truth table for this circuit.

Could someone give me a template or tell me how I could do it?

Thanks!

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I figure one of these will work for you! They are all of the same image.





64leds2mm7.png

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It is not difficult to make a chart of the sequences of the LEDs in the circuit.
A CD4017 steps forward one step each time its input goes positive. It makes one output go positive during a step.

Start the chart by resetting all the CD4017's so that each one has its "0" output high and that LED turned on. Then let the 555 oscillate which makes the "00" CD4017 step its sequence, and its outputs cause the CD4017's connected to its outputs to step through their sequences.

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