NE555+CD4017 CD4017 DIY Kit Rot LED Spaß Zum Selbermachen Elektronik Kit Mehrfachsteuerung
4,83 €
NE555's 3-pin output pulse, and then output CD4017 output high level 5 turns, through a combination of different resistors and transistors, you can drive 7 LEDs to indicate the number of points 1-6 points.
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