timer circuit

[Pilgrim]

Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes. Would
prefer not to get involved with a microP.
Thanks.
CP

 

On Fri, 13 Apr 2012 17:30:22 -0700, Pilgrim <pilgrim@noemail.net>
wrote:

Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes. Would
prefer not to get involved with a microP.
Thanks.
CP

If accuracy isn't critical (> 10% variation either way is OK), then a
pair of 555 timers (or a 556 dual timer) could provide what you
specified.

If timing accuracy is critical, then a simple micro like the PICAXE
(under $5, programmed in BASIC) would be a better choice. For even
better accuracy, you can add a crystal as the clock source and have
one or two seconds per day timekeeping accuracy.

 

[tm]

"Pilgrim" <pilgrim@noemail.net> wrote in message
newsilgrim-3B1BFC.17302213042012@70-3-168-216.pools.spcsdns.net...

Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes. Would
prefer not to get involved with a microP.
Thanks.
CP

Google "555 timer".

 

[Sjouke Burry]

Pilgrim <pilgrim@noemail.net> wrote in newsilgrim-3B1BFC.17302213042012@
70-3-168-216.pools.spcsdns.net:

Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes. Would
prefer not to get involved with a microP.
Thanks.
CP

buy two timing relays.

 

[Phil Allison]

"Pilgrim"

Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes.

** Do the above two ranges need to be independently adjustable - or is that
the tolerance band ?

You need to be FAR more specific.



.... Phil

 

[Pilgrim]

In article <9usfbuFas4U1@mid.individual.net>,
"Phil Allison" <phil_a@tpg.com.au> wrote:

"Pilgrim"

Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes.


** Do the above two ranges need to be independently adjustable - or is that
the tolerance band ?

You need to be FAR more specific.



... Phil

Yes, they should be ind. adj. Accuracy is not important.
Thanks
CP

 

[Jim Yanik]

news@jecarter.us wrote in news:3qhho7h1rcl6crahc72o2cugo9e38qnhns@4ax.com:

On Fri, 13 Apr 2012 17:30:22 -0700, Pilgrim <pilgrim@noemail.net
wrote:

Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes. Would
prefer not to get involved with a microP.
Thanks.
CP

If accuracy isn't critical (> 10% variation either way is OK), then a
pair of 555 timers (or a 556 dual timer) could provide what you
specified.

If timing accuracy is critical, then a simple micro like the PICAXE
(under $5, programmed in BASIC) would be a better choice. For even
better accuracy, you can add a crystal as the clock source and have
one or two seconds per day timekeeping accuracy.

for such long timing periods,use a CMOS 7555/7556.

a neat site I found;
http://www.daycounter.com/Calculators/NE555-Calculator.phtml

calculates values for 555 astable timers.

--
Jim Yanik
jyanik
at
localnet
dot com