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Continue to ChatCD4029 based up and down counter for Arduino and NE555 https://buildcircuits.com/products/cd4029-based-up-and-down-counter-for-arduino-and-ne555
CD4029 based up and down counter for Arduino and NE555 https://buildcircuits.com/products/cd4029-based-up-and-down-counter-for-arduino-and-ne555