Jameco offers a wide selection of 555 timers & combo kits used in a variety of applications including as how-to in 555 Timer Functions. Whether you're looking for a square wave oscillator in astable mode; or a timer in monostable mode, these timers will perform. We also carry the 555 Timer Super Combo which is a companion parts bundle created for those who want to follow a tutorial while experimenting with the parts on a breadboard.