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 ...

The basic 555 oscillator circuit is very simple – just a few caps and resistors and powered by a few batteries.

In this project, I'll make a small circuit capable of controlling a servo, it is a servo tester made out of a 555 timer IC.

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, ...