A previous Design Idea makes clever use of the ability of the 4017 CMOS counters to accept either positive or negative edge-clock signals, even though it leaves two LEDs on at once (Reference 1). But ...
This circuit shows how a 4017 CMOS decade counter can be used to build a timer circuit. Push-button S1 will discharge capacitor C1 through resistor R2. This circuit shows how a 4017 CMOS decade ...
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