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SEQUENTIAL_LED_FLASHER_WITH_REVERSIBLE_DIRECTION

2017-02-01 01:44  
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SEQUENTIAL_LED_FLASHER_WITH_REVERSIBLE_DIRECTION
A 555 timer clocks a 74190 up/down counter. The 74190 drives BCD decoder driver 7442. The 7476 is used to reverse the count on 0 and 9, which results in an up-down-up-down count sequence.