Useful pre-timer

[Enzo]

I came across this circuit for a pre-timer recently. it might be useful to someone. The output turns on a variable time before the button is pressed.

http://www.edn.com/contents/images/286251f1.pdf

The supporting text is here:

http://www.edn.com/index.asp?layout=...cleid=CA286251

[Rob Mercure]

Do I detect a "space-time" paradox here?

Rob

[Enzo]

Gosh, it was in an engineering magazine, it MUST be legit...