The legendary electronic industry workhorse IC, the 8-pin 555 timer, was first introduced (unpatented!) by Signetics in 1972.

It subsequently featured in countless circuits. Virtually every monthly electronics magazine (SILICON CHIP included) continues to have further tips, hints and innovative tweaks for them. In fact, entire "555 Cook Books" have evolved.

In today's silicon chip age, the 30-year endurance of such a humble device is a remarkable tribute to its sound initial design, reliability and cheapness.

It's been the largest volume IC sold every year and the original design, although enhanced with lower powered CMOS versions, remains unmodified.