The 555 timer was designed in 1971 by Hans Camenzind. Since that time, it has remained one of the most popular chips ever. As of 2017, it's estimated that over a billion 555 timers are sold yearly, manufactured by several companies.
There have been a number of posts here recently about 555 timer circuits, so I dug out a couple references that should be helpful.
The first is by the infamous Forrest Mims. Anybody whose been around a while will remember his Experimenters Notebooks at Radio Shack. 555 Timer IC Circuits is a short book, but covers the basics of this popular chip. The link will take you to a pdf of the book.
Another reference is How To Configure a 555 Timer IC - 555 Timer Tutorial by Philip Kane, presented at Jameco Electronics.
There have been a number of posts here recently about 555 timer circuits, so I dug out a couple references that should be helpful.
The first is by the infamous Forrest Mims. Anybody whose been around a while will remember his Experimenters Notebooks at Radio Shack. 555 Timer IC Circuits is a short book, but covers the basics of this popular chip. The link will take you to a pdf of the book.
Another reference is How To Configure a 555 Timer IC - 555 Timer Tutorial by Philip Kane, presented at Jameco Electronics.
