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 ...

This egg timer, which is both simple and functional, shows once again that it is not essential to use a microcontroller for everything these days. This egg timer, which is both simple and functional, ...