The first circuit has 7 LEDs, with all of them off for one clock cycle.3) How would I modify the circuit so that the LED's sequentially latch ON only, and then all shut off before repeating the cycle?
The second circuit turns on another LED (D8) during the off time.
I'm assuming you have already rejected the one-LED-at-a-time 4017 sequencer. This would extend your battery life by a factor of about 4.
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