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 ...

From simple buzzers to an Atari Punk Console, the simple 555 timer chip is the foundation of a whole lot of interesting lo-fi synth projects perfect for beginners. [Steven] put together a great ...

This, of course, means an I2C programmable oscillator in the form of an LPC810. [kodera2t] built this circuit after reaching for a 555 timer a few too many times.

The flasher is the standard 555 oscillator circuit that drives an ultrabright white LED for daylight visibility. Repetition rate is about 2hZ and the duty cycle is about 10%. Peak LED current is 60mA, ...