"Guv Bob" schreef in bericht
m...
My component level electronics is rusty, including RC circuit calculations,
having been doing module swapping for years. This is probably a very
simple question for the folks here....

Is this a reasonable circuit for a delay timer?

If so, how would I calculate the values of R &C for this...

1. Switch closes
2. After 5 seconds, the relay energizes and remains energized until switch
is opened.

Sketch...
http://img839.imageshack.us/img839/4650/uh3.gif

Thanks in advance!

Bob


Yo or nes. As so often it depends. You will have some delay from some us to
eternaly depending on R, C and the ratings of the relay. If the relay is
activated it may do so slowly and the timing will be inaccurate.

Be aware that the LED will need some current limiter.

petrus bitbyter