Reply to "Semaphore and 555 Timer Circuit"

The 74HC family preceded the 74AC family...but has asymmetrical driving capability meaning in an apples-to-apples comparison, the common-anode signal will be a tad brighter than the common-cathode signal.  Otherwise, no problem experimenting with any of the 74 logic families - just be sure you limit the voltage to 5V DC!

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