The 555 also falls into this category because it has an R-C circuit and upper & lower voltage thresholds. A 74HC14 can operate (oscillate) in this mode as well if the output drives an R-C circuit with ...

[fahadshihab], a young tinkerer, shared his circuit design for a simple remote control using 555 timers. Using a 555 calculator, he designed a clock circuit that would run at 11.99 Hz. Two transis… ...