"DaveC" wrote in message
al.net...
On Fri, 7 Jan 2005 16:07:32 -0800, DaveC wrote
(in article et):

Thanks for all the great ideas. All of this makes my (volunteer) job
much
easier.

A new twist to the challenge:

The output needs to be a one-shot, momentary-close event. In other words,
5
minutes after power fails, the contacts need to close and open again. This
alerts the alarm to the power out-condition, and clears the alarm sense
line
for another event to be reported.

Ideas?


Use a 555 timer IC in a one-shot configuration. You could even use a 556
dual timer and use one for the 5 minute delay and the other for the pulse to
close the relay.