Jim Thompson wrote:
On Thu, 10 Mar 2011 21:25:04 -0500, "Martin Riddle"
wrote:


"Jim Thompson" wrote
in message ...
I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

...Jim Thompson

How accurate?

Wow, Fairchild has the 4538 as obsolete. bummer.
I've used the 4040 counter in the past to generate long pulse times. Fed
by a slow running 555.
Just what you wanted to hear

Cheers



Sloppy. I can tune a fairly accurate master oscillator with a pot.

I'm leery of RC due to leakage.

...Jim Thompson

A low-pin-count microcontroller makes a dandy delay element, depending
on the frequency
of the master clock. If you have other slow functions that can be
dumped into it also, it can be cost/space effective.