On 3/30/06, Bob Axtell <engineer@cotse.net> wrote:
> I'd do it with a PIC10F20X. It would be 1/10 size, cost 1/5 as much, and
> would be more reliable than a 555. Take about 5 minutes to write this code.

Bob,
Anyway or anyhow you're looking , 555 is cheapest than any microcontroller.
Usually 10x555 = 1cheap microcontroller, as price.
Output curent capability of a 555 is greatest than any IO.
Not talking you have to write the code, or if you want ONE monostable
this is waste of time.
However there is one problem with 555 monostable: the first false
trigger at power up.

greetings,
Vasile


>
> --Bob
>
> David VanHorn wrote:
>
> >You're looking for a retriggerable one shot, AKA "Missing pulse detector"
> >I've seen 555 ckts to do this, check an older National semi data book
> >
> >
> >
> >On 3/30/06, Rob Robson <rob@silk.net> wrote:
> >
> >
> >>I'm looking for a 555-based monostable (one-shot) circuit whose output
> >>will
> >>STAY high as long as short negative-going pulses are present at the input.
> >>The textbook 555 monostable circuit doesn't do this.  I have a spare NPN
> >>on
> >>the board to utilize if necessary.  Has anyone come across a 555 circuit
> >>that will do this?
> >>
> >>Many thanks,
> >>RR
> >>
> >>
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