You can find general information on 555 timer projects by visiting 555-Timer-Circuits.com. The website offers project instructions, wiring diagrams and ideas involving the 555 integrated circuit.
555-Timer-Circuits.com also offers information such as calculators, data sheets and a community forum. Common projects using 555 timers include blinking lights, pulse width modulation drive and timing clocks. The 556 timer is a dual version that integrates two 555 timers on a single package. The 555 timer is an integrated circuit that uses analogue and digital circuit techniques to output a pulse or oscillating signal. Signetics developed the 555 timer in 1971. It is commonly used in electronics and education.